Transcript
THE CORVUS SERVICE-MANuAL
-, ~ CORVUS SYSTEMS
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11 and 20 Megabyte'Drive
***CORVUS SYSTEMS
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II/20MB Drive Service Manual ERRATA SHEET DISCLAIMER OF ALL WARRANTIES & LIABILITIES Corvus Systems, Inc. makes no warranties, either expressed or implied, with respect to this manual or with respect to the software described in this manual, its quality, performance, merchantability, or fitness for any particular purpose. Corvus Systems, Inc. software is sold or licensed" as is:' The entire risk as to its quality or performance is with the buyer and not Corvus Systems, Inc., its distributor, or its retailer. The buyer assumes the entire cost of all necessary servicing, repair, or correction and any incidental or consequential damages. In no event will Corvus Systems, Inc. be liable for direct, indirect, incidental or consequential damages, even if Corvus Systems, Inc. has been advised of the possibility of such damages. Some states do not ..,l1n .. ,
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RAM
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SERIAL TO PARALLEL CONVERTER
FILTER & AMPLIFIER
DMA CHANNEL
SERVO BOARD
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CRC GENERATOR ICHECKER
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VOICE COIL
PREAMP ELECTRONICS I'A.-----,
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CONTROLLER/LOGIC BOARD
MFM TO NRZ DECODER
NRZ TO MFM ENCODER
FILTER & AMPLIFIER
WRITE DRIVERS
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DRIVE MOTOR
READ/WRITE & SERVO HEADS
READ/WRITE BOARD
DRIVE MECHANISM
Figure 5-3.
Corvus Rev B Block Diagram
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CORVUS DEALER SERVICE 5.3.2
Servo Control Signals
POSITION ERROR SIGNAL (PES): an analog signal available at Backplane pin B27 (B31 for Rev A). The result of the servo head summing two adjacent servo tracks located on either side of the servo head is the tri-bit signal. Sampling peaks of the tri-bit signal and adding these, results in the PES. This will be zero if the heads are on-cylinder. As soon as the heads drift off-cylinder, the tri-bit _! ___ 1 _._!11 -1!_L ___ L .:JJ.bJ.LU.J.
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During a seek command, POSITION MODE is low, and the heads travel across the servo surface, from one servo track to another. Crossing the servo tracks results in a sinusoidal PES. This continues until the head again rests between two servo tracks, on the destination cylinder. When the drive is in position mode, the servo controi circuitry doseiy monitors the PES, appiying correction current to the servo mechanism for any non-zero value of the PES. POSITION MODE: a digital signal available at Backplane pin B24. A high level represents POSITION mode. A low level represents SEEK mode. In POSITION mode, the servo control electronics have control of the servo mechanism, and maintain the position of the heads on the current cylinder. In SEEK mode, the Intelligent Controller takes control of the servo mechanism and moves the heads towards the destination cylinder. When the heads have reached the destination cylinder, the signal returns to a high level and control is returned to the servo electronics. 5.3.3
Servo Operation
During a seek, the Z-80 Controller calculates the difference between current and destination cylinders, resulting in a seven-bit digital value. This word is converted to an analog voltage by a digital-to-analog converter which in turn regulates drive current to the servo voice-coil mechanism. full current is ~pplied to the servo for the majority of the seek, tapering as the heads reach the destination cylinder. The PES is monitored by a zero-crossing circuit on the Servo PCA, which sends an interrupt to the Z-80 Controller each time the heads cross a cylinder. The Controller decrements a counter each time it is interrupted, thus keeping count of cylinders crossed. As the heads pass over the next-to-Iast cylinder, several things occur. The Servo PCA monitors the speed of the heads, and when they have slowed sufficiently to allow the position circuitry to take over, the Servo PCA brings TARGET VELOCITY true. If TARGET VELOCITY is not true, this means that the heads have not slowed, and the Controller applies reverse current to the servo mechanism in an attempt to slow head velocity. If TARGET VELOCITY still is not true, the Controller rezeros the heads and attempts the seek again. When POSITION MODE goes true, control is transferred from the Intelligent Controller to the position circuitry for settling onto the destination cylinder.
Read/Write Electronics The Read/Write PCA is located in slot A of the Backplane/Motherboard. The basic functions of the Read/Write electronics are: .
5.4
1) Convert write data from NRZ {Non-Return-to-Zero} format to MfM (Modified-frequency-Modulation) format before writing it to the platters. 2)
Separates the clock signal from the read data and converts the data from MfM format to NRZ format after
3)
Signal pre amplification and conditioning take place on the Read/Write PCA (on later models).
Two versions of the Read/Write PCA exist: 1)
310101 for use with drive mechanisms which do not have preamp circuitry in the preamp location.
2)
310001 for use with drive mechanisms which have preamp circuitry in the preamp location.
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CORVUS DEALER SERVICE The 310101 PCA may be used in either the 11MB or 20MB drive, however a jumper must first be configured to reflect the drive capacity. This jumper is located on the Read/Write PCA, below resistor R109. To use the 310101 PCA in a 20MB drive, the jumper must be installed, connecting the two pads. To be used in a 11MB drive, the jumper or trace must be cut. T
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Figure 5-4. Read/Write PCA Jumper Location Read Operation Digital bits (ones and zeroes) are represented in NRZ (Non-Return-to-Zero) format by a high logic state (one) and a low logic state (zero). Converting these representative voltages into MFM (Modified-Frequency-Modulation) format, which uses changes of the state of the magnetic flux of the media to represent the digital information (flux change = one, absence of flux change = zero), makes it possible to record this digital information in a high density (see figure 5-5). 5.4.1
Through the use of a data separator, the clock signal is separated from the serial data stream. The clock signal is distributed to the Controller for clocking of all drive functions during the read command.
Write Operation During a write command, the read/write electronics receives digital information from the Controller electronics in NRZ serial format, and converts this data to MFM format. It is then sent to the preamp/select microchip on the heads tack assembly, and on to the heads for writing to the disk media. 5.4.2
During a read command, data is picked from the disk by the read/write heads, and then amplified by the preamp/select microchip in the headstack. Next, it is passed to the Read/Write PCA for further amplification and conversion back to NRZ format, and on to the Controller electronics. During the write command only, the Servo PCA supplies the clock signal to the Controller /Logic PCA for synchronization of data.
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CORVUS DEALER SERVICE
Figure 5-5.
NRZ Oeft) and MFM Data Formats
Controller/Logic Electronics The Controller/Logic PCA functions as the master controller over all operations of the drive. The Controller/Logic PCA is responsible for receiving commands from the host computer system, orchestrating the servo and read/write procedures, and sending a return code to the host computer at the completion of each command. The return code reports the error status of the drive after the command has been executed. The Controller generates the CRC bytes for each block written to the disk surface, and also checks the integrity of data read from the disk surface by checking the CRC bytes associated with each block. 5.5
The Controller/Logic PCA consists of the Z-80 CPU and support logic as well as Controller ROMs (containing procedural 2-80 code for the Intelligent Controller) and on-board RAM (used for buffering data to and from the disk, and utility code loaded from the Controller Firmware area of the disk), Also, four PIO ICs are used to buffer signals to and from the Corvus Mirror, Constellation Multiplexer, Read/Write PCA, and Servo PCA. In addition, the CRC generator!checker error signal is monitored by one of the PIO ICs, and informs the 2-80 CPU in the case of a CRC error or other error. The Controller/PCA communicates with the host computer system through a 34-pin flatcable. Host to Drive Handshaking Control Signals Three signals handle the handshaking protocol. These are STROBE, READY, and BUS DIRECTION. 5.5.1
STROBE This signal is generated by the host system, and acknowledges that the host has sent or received a byte.
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CORVUS DEALER SERVICE READY This signal is generated by the disk Controller, and informs the host system that the drive is ready to send or receive a byte. Data rate transfer is determined by this signal. BUS DIRECTION This signal is generated by the Z-80 Controller, and controls the direction of the bidirectional bus. The host system monitors this signal to determine whether the drive should expect to receive or send a byte of data. 5.5.2
Controller During Seek Command
When the Controller receives a read or write command, it must determine if the requested sector is in the current cylinder or another. If the required cylinder is other than the current cylinder, a calculation is done which results in a digital value representing the difference between the current cylinder and destination cylinder. If this value is zero, the Controller proceeds with the data read or write. If the value is other than zero, the Controller must perform a seek operation. The sign of the difference determines the direction of the seek to be executed; if it is positive, the heads will be moved in towards the spindle, if it is negative, the heads will be moved out towards the edge of the platters. The Controller begins the seek operation by bringing the POSITION MODE signal low. The unsigned digital value is sent to the Servo PCA which converts it to an analog value, and applies it to the servo mechanism which moves the head assembly. The Controller then awaits an interrupt. When the heads cross a cylinder, the Servo PCA sends an interrupt to the Controller, which decrements the distance value by one each time. When the value reaches a value of one, the Controller then monitors the TARGET VELOCITY signal from the Servo PCA. When the heads have slowed sufficiently this signal goes true, and servo control transfers from the Controller circuitry to the position circuitry on the Servo PCA (POSITION MODE goes high), which settles the heads onto the destination cylinder. To verify that the seek operation has been successful, the header information is read from the next sector that passes under the read heads. If the sector address is incorrect, the heads will be re-zeroed and the seek will be attempted again. 5.5.3
Controller During Read and Write Commands
The write command begins when the write command is received, along with the sector address. The Z-80 Controller determines whether the write command is for 128, 256 or 512 bytes, and relinquishes control to the DMA circuitry for transfer of the data from host memory to the on-board Controller RAM. During the host-to-drive data transfer, the processor is put into a wait state while the DMA circuitry transfers the data from the host memory to the on-board RAM. The DMA circuitry uses the Z-80 processor as an address counter, and when the first byte is received from the host system, the DMA circuitry uses the address specified by the Z-80 to write the byte into on-board RAM. Between data byte transfers, the Z-80 is released from the wait state just long enough to increment its address counter. . Once the data is in RAM, control is returned to the Controller which performs a seek to the correct cylinder, if necessary, and reads the first available header to verify the seek. The DMA circuitry next clears the eRC generator/checker, and waits for the proper sector to pass under the head. If the required write function is less than 512 bytes, the block is read in from the sector and the host information is overlaid into the appropriate locations of the block. Next, preparations are made for writing that block out to the disk. When the proper sector comes around, the Controller again turns control over to the DMA circuitry. The processor again is put into a wait state while the DMA transfers data bytes one at a time to the parallel-to-serial converter. A CRC value is generated from the serial data and inserted in the data stream, and both are then sent to the read/write circuitry for output to the heads. The CRC information is used for checking data integrity when read from the disk. The disk write operation is concluded by reading in the block to verify its success. The bus direction is then reversed, and a status byte sent to the host system indicating the result of the disk write.
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CORVUS DEALER SERVICE The read command is similar to the write command except that the data flow direction is reversed. Data and its accompanying CRC byte is received from the read/write electronics and arithmetically summed by the CRC checker/generator. If the result is not equal to zero, a CRC error is generated. If the result is equal to zero, no error is generated, and the data is converted from serial form. to eight-bit parallel form, The OMA electronics then transfers the data to the on-board RAM, using the address supplied by the processor. . . Arter the rea a has successtully completea, the aata bus IS turnea arouna, ana the status ot the reaa proceaure IS sent to the host. The data is then sent to the host using OMA. 5.6 Backplane/Motherboard PCA The Backplane is responsible for transferring power and signals between all system components, and provides a physical mounting for all PCAs. The Backplane, or Motherboard, contains four edge connectors to accept up to four PCA assemblies. All four of these in the Rev A will be filled by the Read/Write PCA, Servo PCA, Micrologic PCA, and Oisk Controller PCA. Three slots in the RevB will be filled by the Read/Write PCA, Servo PCA, and Controller/Logic PCA. The rear of the Backplane contains four double rows of wirewrap pins which accept flatcable connectors from the front bezel Paddleboard PCA, Interface PCA, and sealed mechanism Preamp PCA, as well as the dc power cable. All eight-inch drives use one Backplane/Motherboard part number (310021), wiring changes on the Backplane making it either RevA compatible or RevB compatible. These are not interchangeable, and should not be substituted for one another. Refer to Backplane PCA wiring diagrams in the appendices for identification and current wiring configura tion. Revision-A drives require resistor packs inserted in the 16-pin sockets on the backplane. The Revision-B drives do not require these.
CAUTION: The connectors at the end of aU 34-pin flatcables are available in two sizes: a 10o-mil connector, and a 200-mil connector. The 100-mil connector has two closely-spaced rows of evenly-paried holes. The PROCESSOR port on the rear of the white cabinet accepts a 10o-mil connector. The 200-mil connector has two widely-spaced rows of holes. These two rows of holes are not evenly-paired, but offset by one hole, and each time it is connected, must be inspected carefully to avoid misconnection. This type of connector plugs onto the Backplane of the drive sealed mechanism, interfacing the front bezel Paddleboard PCA, Preamp PCA and Interface PCA to the drive electronics. When placing the 200-mil connectors on the Backplane, be sure to match the first pair of destination pins with the first pair of holes in the connector. The one offset hole at each end of the connector will not match up to any of the 34 destination pins, but will instead mate with an adjacent pin, or no pin at all (i.e., when the destination pins are at the end of a row). The Paddleboard PCA connects to the left end of the row C, (C1-C34, "one" edge to the right). The cable from the PROCESSOR connector on the rear bezel also connects to the Backplane (RevA: 051-084, "one" edge to the left), RevB: C87-C120, "one" edge to the right). The flatcable connecting the preamp PCB to the Backplane connects to row A (A1-A30), "one" edge (dark stripe) to the left. The ten-pin dc power connector from the power supply connects to the left end of the row of power pins located in the upper right corner of the Backplane. The two-wire motor power connector plugs onto the right-most power pins. 5.7 Preamp PCA Located in the bottom of the sealed disk mechanism above the card cage, is the preamp PCA. Two versions of this PCA exist: the early version uses a discrete preamp in this position, and is identified by the components on this PCB. In the later version, the preamp was moved to the read/write PCA, and has a PCA blank in this position.
Two Read/Write PCAs are used with the eight-inch drive. These are not interchangeable, and must be matched to the different preamp configurations above (refer to the PCA compatibility chart in appendix C). Be sure to note Preamp PCA type whenever changing read/write electronics to insure compatibility. 28
CORVUS DEALER SERVICE
Figure 5-6.
Rev A Cabling
Figure 5-7.
Rev B Cabling
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CORVUS DEALER SERVICE Because this PCA is part of the drive sealed mechanism, removing this PCA will break the seal. Do not remove the Preamp PCA. If this PCA is found to be faulty, the drive sealed mechanism must be replaced .. Paddleboard peA The Paddleboard PC A, located on the front bezel of the white drive enclosure, contains switches and LEOs. The tunction ot tnese controis are cietaiieci in section j . j . 5.8
The Paddle board PCA was manufactured in four revisions: 1) For Rev A drives, identified by its three switches and 100-mil connector 2)
For RevS drives, identified by its four switches and IOO-mil connector
3)
For RevB drives, identified by its 34-pin edge-connector and one IC
4)
For RevB drives, identified by its 34-pin edge-connector and two ICs
Versions. 2, 3 and 4 are all compatible with RevB drives, and are not interchangeable with the Rev A version 1. Interface PCA The Corvus disk system will interface to many different microcomputer systems, and may be purchased with any of several interface cards available.
5.9
The typical interface card contains address decoding, bidirectional data buffering, and handshaking circuitry. Some interface cards also have ROMs with boot routines for booting the microcomputer from the Corvus disk. Some do not, and these computers must boot from floppy diskette. Connected to the 34-pin flatcable, the Interface PCA contains two input ports, and one output port and address decoder. One input port is an eight-bit tristate data buffer, used for receiving data bytes during drive-to-host transfers. The other input port is the status port, used for determining the state of the disk drive. The output port is an eight-bit latch, used in host-to-drive data transfers. When the host system needs to access the disk, it first checks the BUS DIRECTION signal, and if the bus is in the host-to-drive direction, and the READY signal is high, the drive is ready to accept a new command. The host now sends command bytes to the drive. During a read or write command, the bus will remain in one direction without turning around, until all bytes have been transferred. The drive will acknowledge the acceptance and execution of commands by setting the bus direction bit of the status port. This is a signal that the return code is on the data bus, which must be retrieved before the drive will accept new commands.
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CORVUS DEALER SERVICE
CHAPTER 6 DISASSEMBLY
CORVUS DEALER SERVICE
CHAPTER 6 DISASSEMBLY 6.1 Scope of Chapter Disassembly of Corvus disk drives is covered in two separate sections. Some Rev A and RevB drives are not contained in a cabinet, and therefore require much less disassembly. Current drive configuration consists of a white cabinet containing the drive sealed mechanism, cooling fan and power supply. 6.2 Introduction All phases of drive disassembly for both the current units and the early stand-alone units are covered in this section. Replacement is on a module basis, and disassembly will be to this modular level. Corvus disk drives have been shipped in several different configurations. These include: 1) The stand-alone drive sealed mechanism has two different power supplies. The CS100 power supply shares a common baseplate with the drive, while the CP129 power supply stands separate from the drive, connected only by the dc power cable. Disassembly procedures for these configurations are covered in section 6.4, Stand-Alone Units. 2)
Later versions of the drive consist of the drive sealed mechanism and either the CP140 or CP411 power supply sharing a white cabinet. Disassembly procedures for these configurations are covered in section 6.3, Metal Package .. WARNING: Before disassembling any disk equipment, be sure power Is disconnected.
CAUTION: Do not under any circumstances operate the drive without first insuring that PCA spacers have been installed between electronic circuit cards. Failure to do this will allow the PCAs to contact each other which may cause catastrophic damage if the drive is powered on.
6.2.1 Tools Required Disassembly of the Corvus eight-inch Winchester disk drives can be accomplished with the following tools: 1) 5/64-inch hex allendriver 2) 3/32-inch hex allendriver 3) 3/16-inch blade screwdriver 4) 5/16-inch blade screwdriver (81h-inch long) 5)
1/4-inch nutdriver
6.3 Metal Package The current package consists of a white cabinet containing the eight-inch disk sealed mechanism, power supply, fan, cabling, and Paddleboard PCA. The cabinet is a four piece assembly. Details for disassembly follow. 6.3.1 Top cover: 1. Remove the eight side allen screws securing the top cover to the basepan. 2.
Remove the cover straight up.
6.3.2 Rear bezel: 1. Remove the four allen screws securing the rear bezel to the basepan. 2.
Remove the bezel straight rearward, being careful not to stress the ac wiring and flatcable wiring.
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CORVUS DEALER SERVICE
Figure 6-L Access Door, Metal Package
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CORVUS DEALER SERVICE 6.3.3 Backplane cover: 1. Loosen the four slot screws securing the smoke-colored plastic cover to the Backplane/Motherboard, and remove it by sliding it up. 6.3.4 Cabling: 1. Disconnect the front bezel Paddleboard flatcable from the drive Backplane {extreme left end of row C}. 2.
Disconnect the interface ribbon cable from the Backplane {extreme right end of row C}.
3.
Disconnect the dc power cable from the power connectors on the Backplane {upper right-hand corner}.
6.3.5 Drive mechanism: 1. Using a long 5/16" blade screwdriver, loosen the six large side slot screws securing the drive mechanism and side-brackets to the basepan. 2.
Lift the drive mechanism straight up off of the rubber side strips. {The rubber strips are adhesive, and may require gentle prying under the brackets to free the mechanism. Be careful not to exert any force on the drive electronics while prying.}
6.3.6 Power supply: 1. Disconnect the dc power connector from the Backplane of the drive mechanism. 2.
Disconnect the front bezel power switch connector from the ac wire harness.
3.
Disconnect the six-pin transformer primary connector from the ac wire harness.
4.
Disconnect the ac cable from the cooling fan.
5.
Remove the four screws securing the supply to the basepan.
6.
Remove the power supply straight up and out of the basepan.
6.3.7. Front bezel: 1. Disconnect the flatcable from the Paddleboard PCA on the front bezel. 2.
Remove sealed mechanism and power supply from the basepan as described above.
3.
Remove the four slot screws securing the bezel to the vertical support brackets.
4.
Remove the bezel.
6.4 Stand Alone Units Some RevA drives and RevB drives were shipped in a stand-alone configuration, either with a CS100 power supply mounted on a common baseplate or with a completely separate CP129 power supply. Disassembly of these is described below. 6.4.1 Disassembly (CS100) 1. Remove the four slot screws securing the power supply to the baseplate. 2.
Tip up the rear of the power supply, exposing the voltage adjustment on the bottom. The voltages can be adjusted now (refer to section 7.3.2.2 for instructions), or the FORMAT and MUX switch wires and dc power cable disconnected from the Backplane, and the supply removed.
3.
Remove the six slot screws securing the drive mechanism to the baseplate.
4.
Remove the drive unit by lifting it straight up and out of the baseplate.
6.5 Drive Electronics Removal and Disassembly All eight-inch disk drive mechanisms contain drive electronics in a card cage, located in the bottom of the drive unit. The complete card set must be removed to replace or adjust any of the electronics.
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CORVUS DEALER SERVICE 6.5.1 Card set: 1. Locate the drive Backplane at the rear of the drive sealed mechanism, and disconnect the preamp flatcable
connector from the top left corner of the Backplane. 2.
Remove the four slot screws and two nutplanes securing the Motherboard to the metal support brackets. The brackets will remain attached to the drive base.
3.
Turn the mechanism on one side, being careful not to let it fall. Locate the two foreward securing screws and supports, located at the corners of the PCAs. Remove these two slot screws.
4.
The Backplane and all electronics PCAs may now be lifted straight away from the drive mechanism. CAUTION: Do not under any circumstances operate the drive without first ensuring that PCA spacers have been installed between electronics circuit cards. Failure to do this will allow the PCAs to contact each other which may cause catastrophic damage if the drive is powered on.
6.5.2 PCA Replacement: 1. Remove card set as outlined above. 2.
Remove the PCA spacers from between the circuit cards.
3.
Gently pull the PCA out of the Backplane slot.
4.
Insert replacement PCA in its slot, making sure it has been seated securely.
5.
Insert the two PCA spacers at the corners of the card set.
6.
Install the complete card set, reversing the removal instructions above.
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CORVUS DEALER SERVICE
CHAPTER 7 ADJUSTMENTS AND MAINTENANCE
CORVUS DEALER SERVICE
CHAPTER 7 ADJUSTMENTS AND MAINTENANCE '7.1
Scope of Chapter
This chapter will cover the check and adjustment of Power Supply voltages, Servo electronics, and Brake mechanism.
'7.2
Introduction
The Corvus disk system is based on a Winchester disk mechanism. Because of this storage device's sealed environment, there is no need of preventive maintenance.
'7.3
Power Supply Voltage Check and Adjustment
Ageing of the power supply and normal heating and cooling of the drive electronics can cause the power supply voltages to drift over time. Voltages should be checked each time the installation is visited for system checkout. WARNING:
Extreme caution should be exercised when adjusting the power supply. High voltages present a potential hazard.
'7.3.1 '7.3.L1
CP140 and CP411 Voltage Check:
1.
Remove cover to the enclosure as outlined in section 6.3.1.
2.
Locate voltage test points along the top side of the power supply. These are labeled +sv, COM, -Sv, +12V, COM, -12V, COM, +24Y.
3.
Turn on the ac power switch.
4.
Using a DIGITAL voltmeter, check the power supply voltages at these connections, using the corresponding COMMON test point for each voltage. All voltages must be within ±O.l volts of the specified voltage, except the +24V which has a tolerance of ±1.2S volts.
S.
If any of the voltages are out of tolerance, follow the adjustment procedure for this supply.
Figure 7- L de Power Cable Connection
3S
CORVUS DEALER SERVICE 7.3.L2
Voltage Adjustment
1.
Remove ac power from the disk drive.
2.
Remove the cover of the drive.
3.
Disconnect the dc power cable from the drive Backplane.
4.
Connect ac power to the disk drive, and turn on the ac power switch.
5.
Monitoring the dc voltages as outlined above, adjust the +5\1, -5\1, and +12V using the following adjustments: CP140 R-IO R R-13
CP411 +5V -sV +12V
R-14
R-27 R-7 R-20
+SV -sV +12V +24V
If any voltages not listed above are out of tolerance, the power supply must be replaced.
NOTE: During adjustment, the +sV or -sV may drop to or near zero. This is due to the over-voltage protection circuitry being activated. To reset this condition, turn off the ac power switch, and bleed the +sV or -sV charge to ground using a lO-K resistor. Set the trim resistor to its original position, turn on ac power and proceed with the adjustment. 6.
Turn off the ac power switch.
7.
Connect the dc power cable to the drive Backplane.
8.
Turn on the ac power switch.
9.
Recheck and, if necessary, readjust the voltages.
7.3.2
CS100 Voltage Check and Adjustment WARNING: Under no condition Is the CS100 to be powered on while disconnected from the disk drive unit. The CS 100 power supply Is a switching power supply, and must be under load to be adjusted properly. Attempting to adjust the CS100 while disconnected from the drive may result In severe damage to the supply and, possibly, harm to the technician.
7.3.2.1
Voltage Check:
1.
Follow disassembly instructions for the CS100 power supply as outlined in section 6.4.1.
2.
Turn on the ac power switch.
3.
Using a DIGITAL voltmeter, check the power supply voltages at the drive Backplane power connector. These are labeled +5\1, -5\1, +12\1, -12\1, +24Y. All voltages must be within ±O.l volts of the specified voltages, except the +24 which has a tolerance of ±1.2s volts.
4.
If any of the voltages are out of tolerance, follow the adjustment procedure for this supply.
7.3.2.2
Voltage Adjustment
1.
Remove ac power from the power supply.
2.
Remove the pm,ver supply from the baseplate, leaving the dc power cable connected to the drive I3ackplane.
3.
Connect ac power to the power supply and turn on the ac power switch.
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CORVUS DEALER SERVICE 4.
Monitoring the +5Voutput, adjust the dc voltages using the following adjustments: CS100 R
All voltages
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All other voltages track with the +5Y, so monitoring this one voltage will result in proper adjustment of all voltages. 7.3.3
CP129
7.3.3.1 Voltage check: 1. Using a DIGITAL voltmeter, check the voltages at the power connections on the Backplane of the drive, using the corresponding COMMON power pin for each voltage. All voltages must be within ±O.l volts of the specified voltage, execpt the +24V which has a tolerance of ±1.25 volts. 2.
If any of the voltages are out of tolerance, follow the adjustment procedures for this supply.
7.3.3.2 CP129 Voltage Adjustment: L Remove ac power to the power supply. 2.
Remove the eight screws securing cover to the power supply and remove the cover.
3.
Disconnect the dc power cable from the drive Backplane.
4.
Connect ac power to the power supply and turn on the ac power switch.
5.
Monitoring the dc voltages as outlined above, adjust all voltages using the following adjustments: CP129 R 4 R 14 R 13 R 17 R 6
+5V -5V +12V -12V +24V
If any of the above voltages are not adjustable within tolerance, the power supply must be replaced.
NOTE: During adjustment, the +sV or -sV may drop to or near zero. This is due to the over-voltage protection circuitry being activated. To reset this condition, turn off the ac power switch, and bleed the +sV or -sV charge to ground using a 10K-ohm resistor. Set the trim resistor to its original position, turn on ac power and proceed with the adjustment. 6.
Turn off the ac power switch.
7.
Connect the dc power cable to the drive Backplane.
8.
Turn on the ac power switch.
9.
Monitoring the dc voltages as outlined above, adjust the voltages if necessary. CAUTION: When adjusting power supply voltages with the drive connected, it is essential that no one voltage be adjusted beyond its tolerance. This requires close monitoring and careful adjustment of the trim resistors. Adjustment of any voltage beyond its tolerance may cause damage to the drive electronics.
37
CORVUS DEALER SERVICE Servo Mechanism Servo mechanism and electronics will change with time, and require occasional adjustment. The servo test monitors the average seek time it takes the heads to execute a full loop seek-from cylinder 0 to maximum cylinder. Adjustment of the servo requires the Dealer Service utilities, a host microcomputer, and an oscilloscope. 7.4
The servo mechanism timing may be checked either by dealer service software, or by oscilloscope. Complete documentation tor the Dealer Service Utilities are detailed elsewhere in this document.
1.
Servo Adjustment: ASM 310176 and 310221 Remove ac power from the drive.
2.
Remove the drive mechanism from the metai cabinet, if mounted in an enclosure.
3.
Place the drive mechanism on one side.
4.
Remove the PCA card assembly from the drive mechanism, leaving the 30-pin preamp cable and motor wires connected between the drive mechanism and the Backplane. Place the card assembly on its side, at a right angle to the drive mechanism. Connect the dc power cable to the drive backplane. Be sure the plastic PCA spacers at the corners of the PCAs remain intact during all service procedures.
7.4.1
Figure 7-2.
Drive Configuration During Servicing
38
CORVUS DEALER SERVICE 5.
Connect the oscilloscope as follows: Channel A:
to Backplane pin B24, ground to pin A77-ABO, select 2V/div., dc coupled
Channel B:
to Backplane pin B27, ground to pin A77-ABO, select 2V/div., dc coupled
Trigger: channel A, negative edge, dc coupled Timebase: Timing:
lOms/div. 70ms ± 2.5ms
6.
Turn on the host microcomputer, then the Corvus drive, observing that the heads re-zero. The drive must come to READY for the diagnostics to communicate with the drive.
7.
Boot the Corvus Dealer Service diskette, select "Controller Diagnostics", execute "DOWNLOAD DIAGNOSTICS" (utility D) and then "ANALYZE SERVO" (utility I). The program will return the average seek time required to execute a full loop seek. This should be 7Oms, ±2.5ms. If the returned value is out of tolerance, follow the adjustment procedures below.
7A. Alternately, "FULL CYLINDER LOOPSEEK" (utility L) may be executed (in place of "ANALYZE SERVO"), which executes an infinite full cylinder loopseek, but does not return a timing value. Use this utility for adjusting the Servo electronics while observing the POSITION MODE and PES signals with the oscilloscope. If the displayed signals are out of tolerance, follow the adjustment procedures below.
Figure 7-3. PES Signals Improperly Adjusted Oeft) and Properly Adjusted
39
CORVUS DEALER SERVICE
NOTE: Each of the following adjustments affect all others. The procedure may need to be repeated several times in order to bring all signals into tolerance. 9. Using RIOs, adjust POSITION MODE signal so the rising edge occurs 70ms ±2.sms after falling edge. (Refer to
diagram 7-3.) 10. Using R62, adjust PES signal so that its peak-to-peak amplitude is 8.4 volts at the beginning or end of the waveform, whichever is least (Refer to diagram 7-3.) IL Using RI22, adjust PES signal for slight undershoot at the last zero-crossing, and minimum ringing after this point. Servo Adjustment: ASM 310006 L Remove ac power from the drive.
'7.4.2
2. Remove the drive mechanism from the metal cabinet (if mounted in an enclosure) or remove from baseplate. 3. Place the drive mechanism on one side. 4. Remove the PCA card assembly from the drive mechanism, leaving the 3D-pin preamp cable and motor wires connected between the drive mechanism and the Backplane. Place the card assembly on its side, at a right angle to the drive mechanism. Connect the dc power cable to the drive backplane. Be sure the plastic PCA spacers at the corners of the PCAs remain intact during all service procedures. 5. Connect the oscilloscope as follows:
Channel A:
to Backplane pin B24, ground to pin A77-A80, select 2V/div., dc coupled
Channel B:
to Backplane pin B31. ground to pin A77-A80, select 2V/div., dc coupled
Trigger: Timebase: Timing:
channel A, negative edge, dc coupled IOms/div. 96ms ±2.sms
6. Turn on the host microcomputer, then the Corvus drive, observing that the heads re-zero. The drive must come to
READY for the diagnostics to communicate with the drive. 7. Boot the Corvus Dealer Service diskette, select "REV A DIAGNOSTICS", and execute "SERVO ADJUST".
8. View the PES and POSITION MODE signals on the oscilloscope while this utility is executing. The POSITION MODE signal should be low for 96ms ± 2. sms. The PES signal should have a peak-to-peak am plitude of 8.4 volts at the beginning or the end of the waveform, whichever is the lesser amplitude. The last zero-crossing of the PES signal should have minimum distortion, a maximum of 2 volts overshoot, while the last three zero-crossings of the PES should be linear with respect to time. If any of these are out of tolerance, follow the adjustment procedures below.
NOTE: Each of the following adjustments affect all others. The procedure (steps 9-11) may need to be repeated several times in order to bring all signals into tolerance.
9. Using RI37, adjust POSITION MODE signal so that rising edge occurs 96ms ±2.sms after falling edge. 10. Using RI94 adjust PES signal so that its peak-to-peak amplitude is 8.4 volts at the beginning or end of the waveform, whichever is least. 11. Using RIsI, adjust PES signal for a maximum overshoot of 2 volts at the last zero-crossing, and minimum ringing after this point. 12. Turn off the ac power switch.
40
CORVUS DEALER SERVICE
13. Connect the oscilloscope as follows: Channel A: Trigger: Timebase: Timing:
pin 2, IC at location B3. Use a ground on the servo board (refer to schematic for this PCA). Select 2V/div, dc coupled.
channel A, negative edge, dc coupled. 10Ons/div. 20Ons, including ghost images.
14. Turn on the ac power switch, and observe that the heads re-zero. 15. Boot the Corvus Dealer Service diskette, select "REV A DIAGNOSTICS", and execute "PLO ADJUSTMENT".
16. View the waveform on the oscilloscope. The PLO pulsewidth should be less than 20Ons, including ghost images. If this signal is out of tolerance, follow the adjustment procedures below. 17. Using R18S, adjust the PLO so that the width of the pulse is a maximum of 200ns (adjusting R18S until the "whisker" trailing the waveform is eliminated, will result in proper adjustment). If this signal cannot be adjusted within this tolerance, this PCA must be replaced. 7.5
Brake Mechanism
Inherent in the Winchester disk design is the direct contact between the heads and the disk surface after the drive has powered off. Contact between these two components can be minimized by very fast acceleration of the platters after power has been applied to the dirve, and very fast deceleration after power-off. The latter is taken care of by the application of the solenoid brake mechanism applied to the motor hub after the platters have slowed sufficiently to no longer aerodynamically support the heads above the disk platters. The brake mechanism should be adjusted only when it is observed not to function properly. Normally, the brake should "click" in and brake the spindle to a stop within 30 seconds after power-off. If this does not occur, the brake should be adjusted following the adjustment procedures below. 7.5.1 Brake Adjustment L Remove ac power from the drive.
2.
Remove the drive mechanism from the metal cabinet, if mounted in an enclosure.
3.
Place the drive mechanism on one side.
4.
Remove the four screws securing the unit bottom cover in place, and swing it aside being careful not to snare the spindle ground strap. CAUTION:
Do not loosen or remove any of the four studs that support the bottom cover. These secure the sealed mechanism bottom plate and help maintain the integrity of the mechanism. Breaking this seal will void the warranty. 5.
Loosen the two screws securing the brake solenoid to the bracket, and move the solenoid away from the hub.
6.
Insert a .02 to .03-inch thickness guage (a double-thickness business card will do) between the brake solenoid plunger and the hub.
7.
Move the brake solenoid firmly up against the hub, with the guage in place.
8.
Tighten the screws securing the solenoid to the bracket, and remove the guage from between the hub and plunger.
9.
Connect the dc power cable to the drive Backplane, and turn on the ac power switch. Check that the solenoid functions when the power is applied to the drive. WARNING: Be careful not to touch the fan while the motor Is tum/ng.
41
CORVUS DEALER SERVICE
Figure 7-4.
Mechanism Adjustment
10. Power off the drive. 1L Replace the unit bottom cover.
42
CORVUS DEALER SERVICE
CHAPTERS DEALER SERVICE DIAGNOSTICS
CORVUS DEALER SERVICE
CHAPTER 8 DEALER SERVICE DIAGNOSTICS 8.1 Scope of Chapter The Dealer Service Diagnostic Utilities are supplied to aid the technician in tracing faults in the Corvus disk drive system, and speed the correction of these faults. The Drive Diagnostic, Controller Diagnostic and Track Diagnostic utilities are covered in this chapter. The Mirror and Omninet Diagnostics are covered in the service manuals for those products. 8.2 Introduction Each Corvus Authorized Dealer Service Center will be supplied with Dealer Service Utilities. These utilities will help the technician exercise and diagnose the Corvus disk and network systems.
The disk drive utilities consist of standard Drive Diagnostic for Rev A and RevB, Controller Diagnostic which will exercise and diagnose the drive utilizing the drive Z-80processor, and a rigorous Burn-In program which exercises and tests the drive system infinitely (i.e. overnight). Also included is a single-track read-write diagnostic, for determining the condition of a track. Some versions of the diagnostic utilities display only 40 characters on the video monitor. When viewing the diagnostic menu under each specific item, typing a question mark (7) will display an additional 40 characters of menu options. 8.3 Drive Diagnostics RevB This program is essentially the same program provided on the Initialization diskettes supplied with each Corvus drive. All options within this program are non-destructive to data on the drive, with the exception of the FORMAT utility. 8.3.1 CRC A good sector is defined as one capable of retaining all bits in the order they were written. When a block is read from a sector, the CRC value is read with it and tested. Bit errors may occur in one of two ways: 1) 2)
physically (faulty media resulting in dropped bits and mismatched CRC bytes) magnetically (miscellaneous bits written to the block resulting in mismatched CRC bytes)
The Cyclic Redundancy Code Test is a non-destructive test which reads each block of data, and checks it against its CRC value. If for any reason, the CRC value does not match the block of data, the CRC checker/generator signals the Controller that an error has been detected, and the processor halts operation. Any errors will be reported at the end of the program. Run this test several times to determine whether the error is due to faulty media (which will show up as repeated errors) or random magnetic bit changes (which will show up as one-time errors). Tracks containing sectors with repeated errors should be spared (use Drive Diagnostic utility PRM). EXR The exercise test seeks random sectors and reads the header information from that sector to verify the success of the seek. Periods print to the video display for successful operations, asterisks for hard errors (errors that exist after ten retrys) and question marks for soft errors (operations that succeed after at least one retry). 8.3.2
Pressing RETURN displays the error list, consisting of total number of passes (seeks), hard and soft errors. Any errors reported should be followed by a CRC test to check for faulty sectors. UPO This utility rewrites the 2 copies of Controller Firmware into the first two cylinders of the drive. The Update utility does not rewrite the Spare Track Table, Virtual Drive Offset Table or Interleaving Specification, nor is it destructive to data. 8.3.3
Boot from the Corvus Utility diskette, and execute the Diagnostic program. Since it is not possible to update the firmware on the boot drive, the system MUST first be booted from diskette. 43
CORVUS DEALER SERVICE The program will display the default Controller Firmware file resident on the diskette (that contains the Update utility). This will be in the form of: ENTER CONTROLLER CODE FILE:
CFxx.x
The current level of Controller Firmware for RevB drives at this writing is CFl7.3.
!f :!~':"~~':'!" '!':'!"':'!0!"' !':' ~0 ~Q 1_1CQ~, it chr\111rl hp pntpTPrl nl"'llAT used whenever updating the Controller Firmware. 8.3.4
Thp hiehpc:t (;md
therefore current) revision level should be
VSN
This utility displays the current versions of the Controller Firmware and Controller ROMs: DRIVE 1: Vxx.x CORVUS SYSTEMS DD-MM-YY CONTROLLER ROM VERSION: nn where DD-MM-YY represents the release date of that Controller Firmware version, xx.x represents the Controller Firmware version (i.e. CFl7.3), and nn represents the suffix of the two Contr01ler ROMs (i.e. 3.22 and 4.22). At this printing, the current versions are: Controller Firmware: CFl'Z3 Controller ROMs: 22 8.3.5
FMT CAUTION: This utility will destroy data on the drive.
The drive may at some time need formatting. This diagnostic-level, or bottom-level format writes the rudimentary magnetic pattern to the tracks required before data may be retained properly.. First turn the FORMAT to the ON (right) position, then execute the FORMAT program. Some versions of this utility request a password, which is HAL When the Format has completed, the program will display: FORMAT COMPLETE - NOW UPDATING FIRMWARE ENTER CONTROLLER CODE FILE: CFxx.x The program will now rewrite the Controller Firmware using the input file displayed. If another version of Firmware is to be used, enter the filename now. The FORMAT program writes default Drive Parameters to the drive (no tracks spared, Interleaving Spec =9, VDO Table: Drive 1 = 0), and should be updated as necessary after the FORMAT program terminates. 8.3.6 PRM The Parameter option of the diagnostic program allows the checking and alteration of the Constellation Multiplexer parameters (including Master Multiplexer Configuration Table and Polling Parameters) and Drive parameters (including Spare Track Table, Sector Interleaving Specification and Virtual Drive Offset Table). 8.3.6.1 MUX Selecting this option displays the Multiplexer table:
M M M M
M M M M X
44
CORVUS DEALER SERVICE Only if a Master Multiplexer is used in the Constellation network is this table to be changed. In the instance that a Master Mux is installed, each of the eight ports (M in the above table) should change to either "N" if no device is connected to the port, "C" if a computer other than a DEC-System LSI-II is connected to the port, or "L" when an LSI-II is used, or left an "M" if a Host Mux is connected to that port. Polling Parameters is the next option of the program. When the drive is used with a Constellation local network with Intertec Superbrain or Radio Shack TRS-80 computers, the Polling Parameters should be changed: Standard Polling parameters: For Superbrain and TRS-80: 8.3.6.2
180,16,32,0 180,32,32,0
DRIVE
Selecting this option displays the spare track table. Whenever a track is found to contain a faulty sector, that track must be removed from service, and a spare track used. These bad tracks are eliminated by listing them in the Spare Track Table. This utility enables the user to: ADD a track to the Spare Track Table (remove it from service) DELETE a track from the Spare Track Table (restore it to service) LIST the Spare Track Table QUIT or exit from the spare track routine The track number containing the faulty sector must first be calculated. The formula for this is: T=(CxN)+H where T is the track number to be calculated, C and H are the cylinder and head numbers respectively, returned by the CRC program. N is the number of data surfaces of the drive. These are as follows: 11MB = 3 data surfaces 20MB = 5 data surfaces The resulting track number should be spared. The Sector Interleaving Specification is the next option of the program. Interleaving, or skewing, is defined as the use of an offset constant in the sequential numbering of sectors. This value for 11MB and 20MB eight-inch drives is nine for all computer systems except the DEC System LSI-II which uses a value of five. Sector Interleaving is shown in figure 4-6. Check the Interleaving Specification whenever the drive is first received, and whenever it is formatted. Next, the Virtual Drive Offset table should read: DRIVE
1
0
unless otherwise instructed by the Corvus User Guide. This table should be checked when the drive is first received, and whenever the drive is formatted. 8.3.7
SET
This utility allows the user to change the slot number, drive number, or drive type of the drive to be tested.
QUIT Selecting this option exits the program, and returns the user to the main Dealer Service menu.
8.3.8
8.4
Controller Diagnostic
The purpose of the Controller Diagnostic program is to provide comprehensive testing for the Corvus disk drives.
45
CORVUS DEALER SERVICE 8.4.1 General Description: The Controller Diagnostic program is a combination of 2-80, host system machine code and high-level language programs which allow the technician to directly communicate to the Intelligent Controller of the disk drive. The code breaks down into three parts as follows:
High-level language terminal program: The high-level portion of the program makes the host ~~
_ _ .... ~ _ _ _ ~_: :_ .. ~11:_~_ .. .t"'-A. .. '-.&. ..... ., ....... .1.&..& ,U,I.L\".u. . l b ' - " l L
"' ...... .a..u.
L ___ : __
1 _._L!_L
"\,,.J...I.,&,U. .I.U..U.
W'V.l.U\,..J.l
_________ .. _, __ , _ . _,.L .L _ .1 __ ' ._ ,....._ ., \"'''11
\...Vl.l1111U1U\..QL\:.
11
¥V1Ll1 lile. "".liVe '-UllL.lUl1t:l.
'T'1 11lCIC
a..1t
several features implemented in the high-level program, such as base conversions, slot selection and the driver which downloads the code to the drive Controller. Host system machine code: The machine code provides the low-level interface to the drive Controller. It transmits and receives data from the Controller according to the parameters passed to it by the high-level program. It is slot selectable and contains a one second time-out feature which allows the program to recover if the drive is not responding. 2-80 code: the 2-80 code is the heart of the diagnostic and is the largest portion of the program. It performs the commands which are passed to it by the high-level program via ASCII characters. It consists of three blocks of code which are loaded to different locations in the Controller memory. 8.4.2 Controller Diagnostic Commands The following is a detailed description of each function of the Controller Diagnostic. Please note that there should be no spaces in the commands unless the notation is specified.
Whenever the entry of a Controller Diagnostic command results in the response "x (YIN)?" where x is the command entered. Be sure the continuation of this test is appropriate; these commands are destructive to data. During normal operation, when an error is encountered, the Controller will repeat the operation in an attempt to succeed. All errors returned by the Controller Diagnostic are reported without retrying the command. 8.4.2.1 A) ABORT DIAGNOSTIC: This command allows the operator to leave the diagnostic and return to the command level of the operating system. The format for this command is:
A 8.4.2.2 B) MACRO MENU: This command allows the operator to create a Macro program. The computer will prompt you with:
W)RITE MACRO
X)ECUTE MACRO
Enter W to create a Macro program. The format for this command is: W The computer wil return with the prompt: ENTER COMMANDS FOLLOWED BY TO END ENTRY, TYPE 'END' Enter single-letter Controller Diagnostic commands from this Controller Diagnostic menu, one at a time, each followed by . The Macro list should begin with "0", and terminate with "END". The computer will then prompt you with: DATA OK?
46
CORVUS DEALER SERVICE Entering a "n" will return the Controller Diagnostic command prompt. Entering a "Y" will result in the computer prompt: ENTER MACRO FILENAME => Enter the name you wish to call the Macro program you have just created (maximum 11 characters). The computer will respond with: * MACRO FILE WRITTEN TO DISK *
The Macro file can be executed by selecting "X" from the Macro Menu. The computer will prompt you for the filename: ENTER MACRO FILENAME => Enter the filename of the Macro program you have previously created, and press . The Macro program will begin execution: * EXECUTING MACRO ==> xx.MAC *
and finish with: * END OF MACRO PROGRAM *
A sample Macro program with the name of "TEST" is on the Dealer Service Utilities diskette. 8.4.2.3
C) CHANGE SLOT NUMBER:
This command allows the operator to change the slot number of the drive under test. The default value is set to slot 2 at the start of execution. (Note: It is possible to have multiple drives under test by starting execution, then changing slot numbers. You will have to return to the original slot to view test results.) The format for this command is: C The computer will prompt you for the slot number as follows: ENTER SLOT NUMBER (DEFAULT=2) ? Enter the slot number desired and press . 8.4.2.4
D) DOWNLOAD DIAGNOSTIC:
This command must be executed before any of the tests can be performed on the drive. This command loads the 2-80 code into the memory of the drive Controller. The FORMAT switch must be on before downloading the diagnostic in order for the program to function correctly. The format for this command is: D 8.4.2.5
I) ANALYZE SERVO:
This command allows the operator to measure the seek time of the servo without an oscilloscope. The format of this command is as follows: I The Controller will perform 256 seeks and then report the average seek time in milliseconds. This number should be 70ms ±2.5ms if the servo is in tolerance. 8.4.2.6
J) SINGLE DO SEEK:
This command instructs the Controller to seek to the cylinder specified in the command. It is used to move the heads to a specific cylinder to observe servo tracks. The format for this command is: ccc J where ccc represents the desired cylinder number in hexidecimal.
47
CORVUS DEALER SERVICE 8.4.2.7 L) FULL CYLINDER LOOPSEEK: This command instructs the controller to continuously seek from cylinder zero to maximum cylinder. This command can be used to check servo action and to adjust the servo board. The Controller will continue seeking until a new command is issued. The format for this command is: I.
8.4.2.8 P) PRINT QUIET SUMMARY REPORT: This command allows the operator to view the results of the sector quiet command. The results are printed in the following format: 1)
SEEK ERRORS: Seek errors are represented in the following format: ccc:ddd:ee where ccc is the desired cylinder in decimat ddd is the cylinder in decimal which was actually found and ee is the error code. See the error codes in section 8.4.3.
2)
CRC ERRORS: CRC errors are represented in the following format: ccc-h xxxxx where ccc is the cylinder number in decimat h is the head number in decimal, and xxxxx is the number of errors in decimal.
3)
TOTAL SEEKS: This number represents the number of seeks the Controller has performed so far. The number will be in decimal.
4)
SEEK TIME: This number represents the total time spent performing seeks in milliseconds. The average seek time can be calculated by dividing seek time by the number of seeks.
5)
RPM: These numbers represent the minimum and maximum speed of the drive during the execution of the sector quiet diagnostic.
8.4.2.9
Q) SECTOR QUIET PROGRAM: CAUTION: This command will DESTROY data on the disk, including Controller Firmware.
This command instructs the controller to begin executing the sector quiet diagnostic. This diagnostic is a very comprehensive test of the drive media and electronics. The Controller performs continuous seeks, reads and writes at random locations on the disk. The results of this test are obtained by the command documented in 8.4.2.8. The format of this command is: Q The Controiler will respond with:
Q (YIN) ? Enter Y to begin the test, enter N to abort. The Controller will continue this test until a new command is issued. 8.4.2.10 S) READ SCAN DISK: This command instructs the Controller to perform a sector verify pass (CRC check), The resu1t!; of the scan will be added to the sector quiet results which are available thru the command documented in 8.4.2.8. The format for this command is: S The Controller will continue to read scan the disk until a new command is issued.
48
CORVUS DEALER SERVICE 8.4.2.11 T) SINGLE CYLINDER SEEK SCAN: This command instructs the Controller to single step across the disk. This can be used to observe the servo tracks as the heads move across the platters. The format of the command is:
T The Controller will continue to seek scan until a new command is issued. 8.4.2.12
X) WRITE SCAN DISK: CAUTION: This command will DESTROY data on the disk.
This command instructs the Controller to perform a bottom level format of the drive. This will not write Firmware, it will simply format the entire disk. The format for this command is: X The Controller will respond with:
X (YIN) ? Enter Y to write scan the disk, enter N to abort. The Controller will continue to write scan the disk until a new command is issued.
8.4.2.13 y) REZERO HEADS: This command instructs the Controller to position the heads on cylinder zero. The format for this command is:
Y 8.4.3
Error Codes
The error codes returned by the command documented in 8.4.2.8 are as follows: 00 01 02 03 04 05 06 07 08 09 10 11
8.S
-
Hardware detected fault in read or write heads move off track while not seeking seek time out Phase lock oscillator error (PLO) sector CRC error cylinder adress mismatch read after write verify error guard band detected in data region read sector time out write sector time out bad track list overflow sector locate error
Bum-In Program CAUTION: This command will DESTROY data on the disk.
Selecting the Burn-In program (menu option #4) will automatically begin the polling of the host computer slots. The program determines the type of drive in that slot, and the burn-in procedure begins on all drives attached to the host system.
49
CORVUS DEALER SERVICE The Burn-In program is a rigorous read-write routine which steps through the drive one chunk at a time, reading and writing specific patterns to each of the sectors. The program divides the disk media into chunks by dividing the total number of sectors by 256. The Burn-In program begins with the highest chunk number. When the read/write test is completed for the current chunk, a random 256-sector read test is executed over the complete disk drive. When this is complete, the chunk number is decremented by one, and the test repeats. The program may be halted at any time by pressing the key or the SPACE bar. This displays a sub-menu: C)ONT L)IST R)ESTART Q)UIT 8.5.1 C)ONT Entering a "C" will cause the program to continue from where it left off. 8.5.2 L)IST Entering a ilL" will cause the error list to be displayed (for example): *** SLOT NUMBER 2 *** CURRENT TIME = 0,75 TOTAL ERRORS: 0 HARD ERRORS: 0 SOFT ERRORS : 0 DO YOU WANT A COMPLETE LIST (YIN)?
Slot number refers to the host slot that the disk drive is interfaced to. Current time refers to A) the pass number and B) the current chunk being tested. Total errors refers to the total (hard and soft) errors encoun tered by this program on this drive since the beginning of this program. Hard errors are those disk read or write errors which, after 15 re-reads or 3 re-writes, are still in error. Soft errors are those read or write errors which, after at least one retry, have been corrected. Requesting a complete list will result in a display of the specific tracks with the error results for each (refer to section 9.4 for detailed information on error codes). 8.5.3 R)ESTART Entering an "R" will begin the program again from the beginning. All error counters will be rezeroed. 8.5.4 Q)UIT Entering a "Q" will return to the Dealer Service Diagnostic menu. 8.6 READ BURN-IN RESULTS This program allows the burn-in results of all drives to be output to the video display or printer:
*** SLOT NUMBER n *** CURRENT TIME = p,cc TOTAL ERRORS: x HARD ERRORS: y SOFT ERRORS : z [followed by a detailed listing of all errors]
where n is the number of the siot that the drive is connected to, p is the pass number, cc is the current chunk being tested, and x, y and z are the total errors, hard errors, and soft errors, respectively.
50
CORVUS DEALER SERVICE 8.7 Track diagnostic The Track Diagnostic Utility is a helpful tool for exercising a particular track suspected of having media problems. This program is destructive to data, and should be used only if a backup of the data exists.
Selecting option 3 from the Dealer Service Diskette will result in the Slot Number and Drive Number prompts. Enter the appropriate values. Pressing will exit the program. The prompt SERVO ACTION (YIN)? is displayed. If the Servo mechanism is not suspect, enter an "N". For each pass (or "pattern"), the test displays the pattern number, the track being tested, and the beginning sector for that track. The Track Diagnostic begins with a read from the first sector on the specified track. This is followed by a write of a specific pattern to that sector, and then a verification of the write. If this is all successful, a dot is printed on the screen. If an error is detected, an asterisk is printed. The test is then repeated on the next sector. Pressing the key or SPACE BAR will halt the test, and display the submenu: C)ONTINUE
L)IST ERRORS R)ESTART Q)UIT
C)ONTINUE Entering a "c" will cause the program to continue on as it was before interruption.
8.7.1
L)IST Entering a "L" will display an error summary (for example):
8.7.2
*** ERROR SUMMARY ***
PASS NUMBER:
0
2160 TOTAL READS 1080 TOTAL WRITES
o TOTAL HARD ERRORS o TRACKS WITH HARD ERRORS o TOTAL SOFT ERRORS o TRACKS WITH SOFT ERRORS The pass number refers to the total number of loops using 256 different patterns to write to those tracks. The total reads and writes refers to the number of times the sector was written to and read from. The number of reads should always be twice the number of writes. Hard errors are those disk read or write errors which, after 15 re-reads or 3 re-writes, are still in error. Soft errors are those read or write errors which, after at least one retry, have been corrected. R)ESTART Entering an "R" will begin the program again from the beginning. All error counters will be rezeroed.
8.7.3
8.7.4 Q)UIT Entering a "Q" will return to the Dealer Service Diagnostic menu.
Drive Diagnostics RevA This diagnostic program offers many of the same options as the RevB Drive Diagnostics, as well as some adjustment utilities unique to the RevA drive. For those utilities not listed here, see Drive Diagnostics, RevB in this chapter. 8.8
51
CORVUS DEALER SERVICE 8.8.1 AD} Selecting this option displays a submenu offering either the PLO adjustment, SERVO adjustment or QUIT. The PLO option executes the proper signal sequence required for adjusting the PLO on the Servo PCA. Execute this utility and follow the instructions in chapter 7 for adjustment of the Servo PLO. The SERVO option executes the proper full loop seek required for checking the timing of the Servo electronics. Execute this utility and follow the instructions in chapter 7 for adjustment of the Servo PCA. Selecting the QUIT option returns the user to the RevA Drive Diagnostic menu.
52
CORVUS DEALER SERVICE
CHAPTER 9 FAULT ISOLATION PROCEDURES
CORVUS DEALER SERVICE
CHAPTER 9 FAULT ISOLATION PROCEDURES Scope of Chapter
9.1
This chapter contains procedures for testing and troubleshooting the Corvus disk system. Recommended test equipment is listed, as are error codes. A troubleshooting flowchart and list of common failures and procedures pertaining to this chapter may be found at the end of this chapter.
Introduction
9.2
Like any sophisticated electronic device, the Corvus disk drive may, at some time, fail. When failure occurs, it usually occurs when the drive is powered on. If the drive is used regularly each day (8 hours or more), leave the drive on indefinitely. This will avoid placing the maximum load on the drive at power-on and extend the life of all drive components.
Tools
9.3
The following test equipment is recommended as a minimum for troubleshooting and repair of the Corvus disk drive: L
Oscilloscope, dual trace, 35 MHz minimum bandwidth
2.
Two calibrated XI0 test probes with ground clips
3.
Digital Multimeter (±O.l percent accuracy) with test leads
4.
Host microcomputer: Corvus Concept or Apple II+ (48K), Corvus Interface PCA and 34-pin flatcable
5.
Corvus Dealer Service Diagnostic Utilities diskette (currently these are available for the Corvus Concept and Apple II computers)
Error Codes For each command sent to the drive by the host operating system, a single-byte error code is returned. It is the responsibility of the operating system to interpret the error code and take appropriate action. 9.4
Errors returned by the Controller are listed below. Errors less than or equal to 127hexidecimal are non-fatal. Those errors greater than or equal to 128 are fatal errors. The format of the error code is shown below: bit
bit
bit
bit
bit
bit
bit
bit
7
6
5
4
3
2
1
o
The eight-bit error code is broken into four segments. Bit 7, when set, indicates that the reported error is a fatal error. Bit 6, when set, indicates that the reported error occurred during the verify (read after write) sequence of the write command. Bit 5, when set, indicates that one or more retrys were attempted before the error was reported. Bits 0-4 represent one of the 21 codes which describe the error (refer to the error lists in this section). 9.4.1
Interpreting Error Codes
Depending on the condition of bits 5-7, there are up to four different error codes for each error condition. To determine the actual error condition, these procedures should be followed: 1.
If the error code value is greater than or equal to 128, a fatal error occurred. Subtract 128 if the value is greater than or equal to 128.
2.
If the remaining value is less than 64, the error occurred during a disk read. If the value is greater than or equal to 64, the error occurred during the verify portion of a write command. Subtract 64 if the value is greater than or equal to 64.
3.
If the remaining value is less than 32, no retrys were attempted. If the value is greater than or equal to 32, at least one retry was attempted before the error was reported.
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CORVUS DEALER SERVICE
When no error has occurred, an original error code value of zero will be returned. Consistent 171 or 235 errors at the same block location indicate bad disk media. Execute the CRC test and follow the instructions for sparing tracks (PRM options, Drive Diagnostics, chapter 8). Consistent 255 errors indicate that the Controller PCA may need replacing. Table 9-L ~127
~128
Non-Fatal
Fatal
Decimal Disk i:rror Lodes
soft error
32 128 129 130 131
160 161 162 163
192 193 194 195
224 225 226 227
error in preparing R/W seek timeout seek fault seek error
132 133 134 135
164 165 166 167
196 197 198 199
228 229 230 231
header CRC error rezero timeout rezero fault drive not online
136 137 138 139
168 169 170 171
200 201 202 203
232 233 234 235
write fault format protected read fault data CRC error
140 141 142 143
172 173 174 175
204 205 206 207
236 237 238 239
sector locate error write protected illegal sector address illegal command op code
144 145
176 177
208 209
240 241
spare track table overflow overlay failure
254 255
verify error (burn-in test) controller timeout (diagnostic utilities)
54
CORVUS DEALER SERVICE Table 9-2. Hexidecimal Disk Error Codes ~7FH
~80H
Non-Fatal
Fatal soft error
20 80 81 82 83
AO Al A2 A3
Co Cl C2 C3
Eo El E2 E3
error in preparing R/W seek timeout seek fault seek error
84 85 86 87
A4 AS A6 A7
C4 C5 C6 C7
E4 E5 E6 E7
header CRC error rezero timeout rezero fault drive not online
88 89 8A 8B
A8 A9 AA AB
C8 C9 CA CB
E8 E9 EA EB
write fault format protected read fault data CRC error
8C 80 8E 8F
AC AD AE AF
CC CO CE CF
EC ED EE EF
sector locate error write protected illegal sector address illegal command op code
90 91
BO Bl
Do 01
Fo Fl
spare track table overflow overlay failure
FE FF
verify error (burn-in test) controller timeout (diagnostic utilities)
55
CORVUS DEALER SERVICE Table 9-3. Signed Decimal Disk Error Codes ~-129
~-128
Non-Fatal
Fatal soft error
-224 -128 -127
.
.
n
n .. ,
-96
-()4
-~.t.
t::llUl ill plt::pC11H1 0
-125
-95 -94 -93
-63 -62 -61
-31 -30 -29
seek timeout seek fault seek error
-124 -123 -122 -121
-92 -91 -90 -89
-60 -59 -58 -57
-28 -27 -26 -25
header CRC error rezero timeout rezero fault drive not online
-120 -119 -118 -117
-88 -87 -86 -.85
-56 -55 -54 -53
-24 -23 -22 -21
write fault format protected read fault data CRC error
-116 -115 -114 -113
-84 -83 -82 -81
-52 -51 -50 -49
-20 -19 -18 -17
sector locate error write protected illegal sector address illegal command op code
-112 -111
-80 -79
-48 -47
-16 -15
spare track table overflow overlay failure
-2 -1
verify error (burn-in test) controller timeout (diagnostic utilities)
-126
56
l"r~
CORVUS DEALER SERVICE 9.5 Troubleshooting Procedures When a disk drive fails to function normally, the problem may range from a faulty sector to total drive failure. It is the responsibility of the service technician to interpret the symptoms, isolate the faulty component, substitute a replacement, and thoroughly test the drive before returning it to service. Corvus provides its Dealer Service Centers with diagnostic utilities and service documentation to aid the technician in servicing Corvus products. The Dealer Service Utility diskettes include diagnostics for testing all phases of drive operation. These utilities are described in Chapter 8, ''Dealer Service Diagnostics". Also included in this chapter are a Disk Drive Troubleshooting Flowchart, and a list of Common Symptoms and Solutions. The text in this section follows the flowchart located at the end of the section and should be referred to while following the text. In using the troubleshooting aids provided, take the following precautions: 1.
Make sure all drives have the current version of Controller Firmware and Controller ROMs. Old versions of either may be incompatible with current versions of software.
2.
Be sure to disconnect the ac power cord before replacing any modules.
3.
Use only known good components when substituting.
4.
Retest the system after each component has been substituted.
5.
Check and adjust the Servo electronics each time the Servo PCA is replaced.
On-Site Checks 9.5.1 There are several quick checks that can be taken that do not require disassembly of the drive: 1.
Be sure the ac power cable is plugged in, and the power switch is turned on.
2.
Examine the front bezel switches to verify their proper settings.
3.
On the rear bezel, check that the CORCOM unit has the correct line voltage and fuse selected.
4.
Verify that the interface cable is not damaged, and has been properly connected at both ends.
5.
Check to see that the interface is in the correct bus slot (where applicable) of the host computer.
6.
Communication with the drive must first be established in order to further diagnose any faults. The first indication of this is the READY LED. If this does not light, turn the FORMAT switch on (right position) and toggle the RESET switch. If the READY LED now lights, update the Controller Firmware on the drive (UPD option, Drive Diagnostics, Chapter 8).
9.5.2 Isolate the Problem Malfunctions in the Corvus disk system may be divided into three catagories: L
Magnetic (Controller Firmware integrity, data integrity, format integrity, boot image integrity),
2.
Electronic (host computer function, Corvus drive Servo, Controller, Read/Write electronics function, power supply)
3.
Environmental (power stability, temperature and humidity limits).
The first step in analyzing faults in the Corvus disk system is to isolate the drive from other devices. This includes removing networks (such as the Constellation and Omninet local networks) and backup devices {such as the Corvus Mirror}. Using a known good Interface PCA and flatcable, connect the Corvus disk drive to a known good host computer. Before any diagnosis of the Corvus disk drive can be carried out, the symptom must be duplicated. If the problem does not reoccur within a reasonable amount of time, run the burn-in diagnostic program overnight to thoroughly test the drive.
57
CORVUS DEALER SERVICE
9.5.3 Drive Not READY In order to troubleshoot faults in the Corvus disk drive, it must first be in the READY condition, indicated by the READY LED being lit. First, power on the drive and wait approximately 90 seconds. The READY LED alone should light, and if this does not occur, steps must be taken to correct it. Interface 9.5.3.1 The host computer interface PCA or cable could be defective, not allowing the drive to reach the READY condition. Disconnecting the flatcable from the drive PROCESSOR connector will isolate the drive. If the READY LED now lights, replace the interface components, one at a time, to isolate the faulty module.
Controller Firmware During the normal power-on sequence Controller Firmware is read into the Controller RAM. If the Controller Firmware has been disrupted and no longer contains the proper code, the drive will not be READY after the power-on sequence completes. To determine if this is the cause of the symptom, turn on the FORMAT switch and toggle the RESET switch. This will reset the Z-80 Controller, and if the drive passes the hardware self-test, will ignore the Controller Firmware. If the READY LED now lights; faulty Controller Firmware is indicated and the UPDATE utility must be executed to rewrite the Controller Firmware code. After this has been done, turn off the FORMAT switch and toggle the RESET switch. This again will reset the Z-80 Controller which will read the newly-written Controller Firmware into the on-board RAM. Power Supply Voltages 9.5.3.3 If the fault has been determined to be a drive hardware failure, the first action taken should be to check the power supply voltages.
Check the voltages when the drive is first received, and because of line voltage variations between locations, at the customer site also. If any of the dc output voltages cannot be brought within tolerance, the power supply must be replaced. Using a DVM, follow the voltage check and adjustment procedures outlined in section 7.3 of this manual. The ten-pin dc power connector and the two-pin motor power connector, located at the upper right corner of the drive Backplane, should be checked for a clean and tight fit. Measuring the voltages at the drive Backplane power pins will verify that the power connector and cable are in good condition. Inspect the dc power cable for breaks. The CP129 has a cable with connectors at both ends, while most others use solder connections where the cable attaches to the supply. The power cable may be faulty if the voltages are not present at the drive Backplane. Symptoms indicating power supply failure include front bezel LEOs failing to light, drive motor failing to turn or speed fluctuating, heads slamming against inner crash stop, and drive going off-line (drive error 255). Dc output of the power supply is a function of the correct ac input; the dc voltages wiH not be correct if the improper line voltage is selected. To verify that the proper line voltage has been selected, locate the CORCOM unit on the rear bezel of the drive cabinet. This unit contains the fuse and voltage selection PCA. If the voltage is change, be sure that the line fuse is also changed. (Refer to section 2.4 for instructions.) Symptoms indicating incorrect line voltage selection include dim or dark LEOs, low motor speed and extreme heat output. 9.5.3.4 RESET Line If the READY LED shii does not iight, the RESET hne may be heid down by a fauity component. Using a DVivl, check the voltages at both sides of pull-up resistor R3 on the Controller/Logic PCA. One side of the resistor is connected to the +5V supply, and should show a steady +5Y. The other side of the resistor is connected to the RESET line, and should be a TTL-level high signal (+2.5V minimum). If the voltages are not within tolerance, replace the IC at loction Bl (74LS08) if it is socketed. If it is not socketed, replace the Controller/Logic PCA.
58
CORVUS DEALER SERVICE
CON TIOlU I/LOGIC IO.ID LIGINO SlllSCIllN 3101S1
•
c
~
• U
Figure 9-L Location of R3 for testing of RESET. 9.5.3.5 Drive Electronics If the READY LED will not light, and the power supply is operating properly and the voltages are within tolerance, it is probably due to a faulty component within the drive electronics.
Sometimes symptoms indicating a faulty drive PCA are in fact caused by poor contact between connectors. Power supply connectors, PCA edge connectors, IC sockets and switch contacts are some of the connectors which may lose contact, and result in a malfunctioning drive. Reseating all connectors and using an eraser on all gold edge connector pins will help eliminate any oxidation that may have built up, causing improper contact. Also, res eating socketed ICs on the Controller/Logic PCA will ensure good pin connections. Simply disassembling and reassembling the drive may eliminate symptoms that seem to indicate faulty electronics. WARNING: Always tum off ac power and disconnect power cord before replacing any components. Replace the drive electronics with a known good set: 1.
Remove power to the drive.
2.
Disassemble the drive and remove the electronics card set as outlined in sections 6.3 and 6.5.
3.
Install a known good electronics card set.
4.
Power on the drive.
59
CORVUS DEALER SERVICE
If one of the PCAs was faulty, the READY LED will now light. The next step is to isolate the faulty PCA by replacing the known good PCAs, one at a time, with the original ones: 1.
Remove power to the drive.
2.
Remove one known good PCA.
~.
instaii une urigilldi rCA.
4.
Power on the drive.
Repeat the above four steps until either the READY LED light does not light after the drive has been powered on, or all original PCAs have been re-installed. If, after re-installing an original PC A, the drive is not READY, remove and label the original PCA last installed as faulty, and re-instali the other originais.
If the servo mechanism is behaving irratically, the servo parameters should be checked for proper adjustment as outlined in section 7.4. If after adjustment, the servo still behaves irratically, the Servo PCA should be replaced, and the new one readjusted if necessary. If, after installing all original PC As the READY LED does not light, the drive mechanism should be replaced. 9.5.3.6 Drive Sealed Mechanism The Drive Mechanism is a sealed unit with no internally serviceable parts. The only adjustment on the Drive Mechanism is that of the brake solenoid (section 7.5). Any other malfunctions with the Drive Mechanism necessitate replacing the drive module.
Drive Mechanism failure may be due to anyone of the following: L
Microchip failure
2.
Drive motor failure
3.
Preamp failure (where applicable)
4.
Servo track failure
Failure of the platters to turn could be caused by a misadjusted or defective brake mechanism. Check the brake for proper function and adjust if necessary (section 7.5). Servo tracks will weaken as the drive ages, and can be seen as noise on the PES. Connect an oscilloscope to the drive as outlined in the Servo Adjustment (section 7.4) and execute the CRC test. The PES should be quiet while positioned on a cylinder. The more noise seen in the signal, the weaker the servo track has become. A servo track that is defective will show distinct spikes in the PES (figure 9-2). Six-hundred millivolts of noise is considered the operable limit. 9.5.4
Link Inoperative
If the drive powers on, spins up to speed, passes the selt-test and the READY LED Lights, certain basic circuits and sub-systems within the drive are working. The test does not, however, verify the integrity of the Disk Operating System (DOS), the disk media or much of the drive electronics and power supply. If the DOS is damaged or not properly patched for communication to the Corvus disk drive (initialization procedures, Corvus User Guide), the drive will not function properly. Linking is the process of booting the host computer with the Corvus-patched DOS. The type of DOS depends on the type of computer system, and should be a known good copy, patched for the Corvus drive. For those systems that do not store a DOS image on the Corvus drive and then boot directly from the Corvus (CP/M does not), booting the standard DOS and executing the liNK program win establish the patch. Corvus recommends that the Corvus Dealer Service Centers keep on hand archival, known good Corvus-patched copies of the DOS for the specific computers serviced at that location. This will ensure that a new DOS copy may be substituted for the users' DOS for troubleshooting purposes.
60
CORVUS DEALER SERVICE
Figure 9-2.
PES as a Result of Good Servo Track Oeft) and Bad Servo Track (right)
Check Link Action 9.5.4.1 Boot the computer using a known good boot image or link software. When this has been done, list the directory of the drive or volume. If this fails or a drive error is returned, steps must be taken to correct this. 9.5.4.2 Power Supply The power supply voltages should be checked and adjusted if necessary before any further testing is done. Without proper voltages, the read amplifier on the Read/Write PCA will be referencing incorrect thresholds for the data signat possibly mistaking a good sector for a CRC error. 9.5.4.3 CRC Test Execute the CRC test. This will verify the condition of the drive media. The CRC test will report either no errors or the cylinder, head and sector numbers of the faulty sector. If the CRC errors are encountered, the complete track must be spared (PRM option, Drive Diagnostics, Corvus User Guide).
Sometimes the CRC test will not begin (READY LED remains lit) or will not finish (BUSY LED flickers momentarily, and then the READY LED alone lights). A misadjusted power supply or improper format could cause this, as could incorrect Read/Write PCA jumper selection (refer to section 5.4). Check that these are set correctly. If a servo track is damaged, the heads will not seek past that cylinder, and the CRC test will fail. Also, a damaged copy of the CRC program could cause problems, making it impossible to trace problems without a known good copy of the utilities.
61
CORVUS DEALER SERVICE 9.5.4.4 Servo Test If servo action seems erratic or if read or write errors are encountered, the Servo Test (Drive Diagnostic utility EXR)
should be executed. This program is not destructive to data. The program commands the heads to seek random sectors and verify the block of data in that sector. Dots print on the screen for sector reads completed without error, an asterisk prints for hard errors encountered during a read, and a ~uC:,;~~v., u-,z..~ y::;:~::; ~~: :~ft ~!"!"~:o; ~!",:"01_1n."'r",rI rlllrin~;:1 rp;:Id Prp~~ing RETURN will list all errors. If any errors are encountered, the Controller Diagnostic command Analyze Servo (I) should be executed, and the servo electronics checked and adjusted if out of tolerance (section '7.4).
Controller Firmware 9.5.4.5 Controller Firmware shouid be rewritten at this point and the drive parameters checked (Drive Diagnostic utiiity PARAM) if this has not been done already. The Z-80 Controller does not check each block in the Controller Firmware area to check that it is legitimate Controller Firmware code, and will attempt to load it into the on-board RAM when the drive is powered on. If the READY LED lights after power-on, this is no indication that all the Controler Firmware code is intact. Rewrite the Controller Firmware using the Drive Diagnostic utility UPDATE. Rewriting Firmware is non-destructive to data. Boot ROM Some computer systems use a boot ROM on the Interface PCA to boot a DOS image from the boot area of the drive. A faulty memory loction in this ROM may cause the drive to fail at boot time. Replace only with a tested, known good replacement.
9.5.4.6
9.5.4.7 Interface Components A defective Interface PCA or cable may be the cause of problems with the drive. Replace both, only with tested, known good replacements, and reinstall originals, one at a time, retesting the drive after each.
Drive Initialization Corvus provides drive initialization software for each computer operating system (CP/M, Apple DOS, UCSD Pascal, NEWDOS, IBMDOS, CCOS, etc). These utilities initialize the platter surface for accepting a DOS boot image (where applicable) as well as directory and data area.
9.5.4.8
These areas of the disk, if disturbed either physically or magnetically, will no longer retain the correct information sought by the CATALOG or DIRECTORY listing commands. In this case, the initialization procedures (i.e. PUTGET, PSYSGEN or BSYSGEN) must again be executed to properly initialize the disk surface {refer to the Corvus User Guide for initialization procedures}. Be sure to use archival, known good copies of all software whenever initializing the drive. Any problem persisting after following the flowchart to this point lies either with the drive electronics or the disk media. The electronics should be tested, and if this is not found to be the cause of the problem, the drive should be re-initialized, using a new copy of the software utilities.
Final Adjustments and Tests When the faulty module in the drive has been replaced and the problem eliminated, the repair process is only halfway completed. Finai checks and adjustments must be made and the drive tested thoroughly overnight before it may be returned to service. 9.6
Proper Headlock Operation First determine which type of headlock the sealed mechanism has. To check the headlock mechanism for proper function, power off the drive and, in the case of the rnanual headlock device, secure the heads by turning the headlock screw located on the side of the sealed mechanism (no action need be taken for autolock mechanisms). Tip the servo end of the drive (the end with the Backplane PCA) three to four inches off the working surface. If the headlock mechanism is functioning properly, the heads will not skate towards the spindle. If the heads move, this indicates a faulty headlock, and the drive mechanism must be replaced to remedy the problem. 9.6.1
62
CORVUS DEALER SERVICE CRC Test The drive media must be verified reliable before the drive can be certified usable. The CRC test should be executed before and after the drive image is restored with the Mirror, to check that no sectors have been destroyed. Tracks with faulty sectors should be spared using the PARAM option of the Drive Diagnostics (refer to section 8.3.6). 9.6.2
Servo Check and Adjust Even though the servo electronics may have been checked and adjusted at some time during the troubleshooting procedures, they must be checked now, and adjusted if necessary. Changing PCAs or adjusting the power supply voltages will affect the servo action, as will changing the drive sealed mechanism itself. 9.6.3
Install and Test Mirror If a Corvus Mirror backup device was part of the original disk system, it should have been removed from the system as one of the first steps in troubleshooting the drive. Having traced and replaced the faulty component in the drive, the Mirror should now be installed and tested. Refer to the Corvus Mirror Service Manual for procedures on troubleshooting and servicing the Mirror. 9.6.4
RESET Line Checking the RESET line should be a routine function performed each time the drive is serviced (refer to section 9.5.3.4 for instructions). Whether or not this procedure was previously performed on this drive, it should be done now. If the voltage of the TTL-high signal at R3 is not within tolerance, follow the replacement procedures outlined in section 9.5.3.4. 9.6.5
CRC Test Executing the CRC test once again, verifies that elementary communication exists, and that no sectors were accidentally destroyed by restoring a faulty Mirror image. 9.6.6
Power Supply After troubleshooting procedures have been completed, the power supply voltages must be checked once again before the drive can be tested. This is to ensure that the Burn-In test is testing a properly adjusted drive. 9.6.7
9.6.8 Bum-In Test The Burn-In test is the final endurance test of the drive, revealing any malfunctions as hard or soft errors. This program tests the seeking, reading and writing abilities of all drives connected to the host computer.
The Burn-In test should be run, at a minimum, overnight after all repairs and adjustments on the drive have been completed. If any sectors experience errors, the Track Diagnostic program should be executed for all tracks containing suspect sectors to determine if these are recurring errors. If the errors persist, the tracks should be spared (Drive Diagnostic utility PARAM).
63
CORVUS DEALER SERVICE
Figure 9-3. Checking Proper Headlock Operation.
64
DISK DRIVE TROUBLESHOOTING FLOWCHART
START)
t
~----------------------------------~--------------------~--------.---------------------------------------------------------------~
BACKUP DATA IF POSSIBLE
NO~Rf~I~AL
t
,.....------<
REMOVE MIRRORS AND NETWORKS
YES
REPLACE INTERFACE CABLE OR PCB
ADJUST VOLTAGES
~---!..--....
YES
INSTALL ONE ORIGINAL PCB
USE KNOWN GOOD COMPUTER
gR~p.~~~~i~~ I~~~ F~:~~~;~: L~ DI'~~~~lT L~~rYE-S--------.~ ~ -~NO~ESL-----~I-~0L--------~I ~ND ~ __
LABEL FAU LTY PCB. REINSTALL REMAINING ORiGINAL PCBs. NO .......- - - - - - - -....
DRIVE READY
kS
SWAP DRIVE ELECTRONICS
?
/Q£il~~~> - - - - - - - - . 1
t------~(
READY
?
NO
____
REPLACE DRIVE MECH .. FORMAT DRIVE
YES
~
RUN CRC TEST
OES
FU~V~ON
. - -_ _ _ _ _ _ 1
I SET SWITCHES CORRECTLY
NO
YES ADJUST SERVO ELECTRONICS
YES
t--
RUN EXERCISE TEST
FORMAT DRIVE
r---
R/W OR SERVO ERRORS NO
NO
~
~OWER
YES
SUPPLY VOLTAGES OK
?
BOOT CORVUS UTILITY DISKETIE- f-YES RUN DIAGNOSTIC YES PROGRAM
NO RUN CRC TEST
TEST FINISH
?
l
YES
~ L~YES ER~~CRS EX~W~ISE ~~VO OR
NO ..._TE-:-1S_T....."
?
ERR?ORS
UPDATE
~~~~~~~Er
NO ...--'-'''""C"'""H'''''EC"'""K= PARAMETERS.........
DOES LINK FUNCTION
?
CRC TEST
NO
~
REPLACE BOOT ROM (WHERE APPLICABLE)
SERVO CHECK AND ADJUST
~
YES
YES
YES SPARE FLAWED TRACK(S)
CHECK PROPER HEADLOCK OPERATION
~
?
NO
BEZEL SWITCHES SET CORRECTLY
?
YES
TEST FINISH ?
t
ADJUST ,"---__ VO_LT-yA_GE_S_.....
~ PROB. SOLVED ?
NO
YES
I
" - - - - - - -.....
UPDATE CONTROLLER FIRMWARE. TURN OFF FORMAT SW TOGGLE RESET SW
SET SWITCHES CORRECTLY
ERROR IN FOLLOWING FLOW CHART
PCBs
INST~LLED
DOES LINK FUNCTION
REINSTALL AND TEST MIRROR
?
-.1
NO
CHECK RESET VOLTAGE AT R3
REPLACE INTERFACE CABLE OR PCB
DOES LINK FUNCTION ?
~
NO
CRC TEST
REPEAT INSTALLATION PROCEDURES DIR AREA. BSYSGEN. ETC.
t YES
YES DOES LINK FUNCTION ? YES
j
NO
IS PROBLEM HARDWARERELATED ?
NO SOFTWARE OR PROCEDURAL PROBLEM
POWER SUPPLY VOLTAGE CHECK AND ADJUST
t RUN BURN-IN PROGRAM OVERNITE
C- END
)
CORVUS DEALER SERVICE SYMPTOM
CAUSES
RECOMMENDED REPAIR
ac power improperly selected.
Check and adjust.
P.S. 24V misadjusted or nonexistent.
Check voltage and adjust.
24V not present at backplane.
Check de power connector and motor connector for continuity and proper connection at backplane.
Power supply defective.
Replace power supply.
Brake solenoid not releasing.
Adjust brake mechanism.
Drive motor defective.
Replace drive sealed mechanism.
Interface cable defective.
Replace interface cable.
Controller ROMs (3.xx and 4.xx) on the Controller PCA defective.
Replace Controller ROMs.
Controller PCA defective.
Replace Controller PCA.
Defective software {either FORMAT or CFxx.x files}.
Obtain known good copy of software.
Headlock is engaged.
On manual-lock drives, disengage headlock. On auto-lock drives, verify that heads are free by observing heads as drive is spinning up to speed, while tilting drive.
Controller unit address set incorrectly.
Set switches correctly.
Read/Write PCA defective.
Replace Read/Write PCA.
Servo PCA defective.
Replace Servo PCA.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMs.
Servo mechanism defective.
Replace drive sealed mechanism.
Drive is not "Ready".
Turn on FORMAT switch, toggle RESET switch.
Firmware is wrong level for revision of drive.
Rev A and RevB drives use different Firmware. Locate latest firmware for drive, copy to drive.
CRC error in Controller Firmware area.
Replace drive mechanism.
Servo needs adjustment.
Adjust Servo electronics.
L Drive platters won't turn.
A. All LEOs off and remain off.
B. All LEOs light then BUSY alone remains lit. 2. Unable to format drive. A. READY remains lit.
B. BUSY remains lit constantly.
3. Unable to update Controller Firmware (CFxx.x). A. All LEOs go off, remain off.
66
CORVUS DEALER SERVICE SYMPTOM
B. Busy LED lights and remains lit.
CAUSES
RECOMMENDED REPAIR
Servo PCA defective.
Replace Servo PCA.
Controller ROMs (3.xx and 4.xx) on Controller PCA detective.
Replace Controller ROMS.
Controller Logic PCA defective.
Replace Controller PCA.
Read/Write PCA defective.
Replace Read/Write PCA.
Drive Sealed rv1echanism defective.
Replace Drive Sealed
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Read/Write PCA defective.
Replace Read/Write PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Front bezel switches incorrect.
Verify correct setting of switches.
Servo needs adjustment.
Adjust Servo electronics.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Format not intact.
Format drive.
Controller/Logic PCA defective.
Replace Controller/Logic PCA.
Read/Write PCA is defective.
Replace Read/Write PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Servo PCA defective.
Replace Servo PCA.
Track is already spared.
No action necessary.
Controller ROMs (3.xx and 4.xx) on Controller PCA r .. aerealve.
Replace Controller ROMS.
Controller/Logic PCA defective.
Replace Controller/Logic PCA.
Drive Sealed Mechanism defective,
Replace Drive Sealed Mechanism.
~v1echanism.
4. CRC FORMAT CHECK will
not begin or will not finish. A. BUSY LED lights and remains lit, or FAULT LED only remains lit.
5. Unable to spare track.
A. All LEDs off and remain off.
1
67
CORVUS DEALER SERVICE SYMPTOM
CAUSES
RECOMMENDED REPAIR
Maximum number of tracks have been spared (maxim urn of 7 possible).
Replace Drive Sealed Mechanism.
Defective Read/Write PCA.
Replace Read/Write PCA.
Power Supply voltages misadjusted.
Check Power Supply voltages. Adjust if necessary.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Read/Write PCA defective.
Replace Read/Write PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Boot image corrupted.
Recreate boot image (see user guide).
Boot image contains improper values.
Recreate boot image using correct values.
Boot program on Corvus Utility diskette corrupt.
Recreate boot image using known good copy of Corvus Utilities.
Boot ROM (where applicable) or Interface PCA defective.
Replace Boot ROM. If problem persists, replace Interface PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Drive does not contain boot image.
Create boot image on drive (see user guide).
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
Power Supply defective, dc power cable defective.
Check voltages at Power Supply. Replace Power Supply if non-existant. If voltages are present, check dc power cable.
Boot ROM (where applicable) or Interface PCA defective.
Replace Boot ROM. If problem persists, replace Interface PCA.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism,
6. Servo Exercise Diagnostic
will not execute. A. BUSY LED lights and remains lit.
7. Computer boots into monitor.
A. All LEDs off and remain off, or BUSY LED lights and remains lit.
8. Drive will not boot.
A. BUSY LED lights and remains lit.
68
CORVUS DEALER SERVICE SYMPTOM
RECOMMENDED REPAIR
CAUSES
9. 110 errors during normal
operation. A. Normal LED display, 11 T'I"""T"""'II.
rr
1
VI dU LL1J::' Vl1 dllU
remain off.
Software currently running on 1.
lIV::'L
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r
.'
UC::IC::~UVC::.
Replace software with known good copy, and ___ , ____ .1_
.lCCAC .... U.U;.•
Boot image corrupted.
Recreate boot image (see user guide).
Defective track.
Execute CRC FORMAT CHECK. Spare any tracks returning errors.
Controller/Logic PCA defective.
Replace Controller /Logic PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
dc power cable defective.
Replace power cable.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Read/Write PCA defective.
Replace Read/Write PCA.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
dc power cable defective.
Replace power cable.
Power Supply voltages intermittent.
Replace Power Supply.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Controller Firmware corrupted.
Update Controller Firmware.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Controller PCA defective.
Replace Controller PCA.
Read/Write PCA defective.
Replace Read/Write PCA.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
10. Heads slam against inner
crash stop (spindle seek). A. BUSY LED lights and remains lit.
69
CORVUS DEALER SERVICE SYMPTOM
CAUSES
RECOMMENDED REPAIR
Magnetic-field-generating device (video monitor) located too near drive.
Position device further from drive.
Boot ROM (where applicable) or Interface PCA defective.
Replace Boot ROM. If problem persists, replace Interface PCA.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
Ac power surge during Read/ Write operation.
Determine quality of ac power supplied to Corvus and host computer. Determine types of electrical devices on same ac circuit. Large power-consuming devices should not share power with the disk drive. A dedicated ac circuit for the system is best.
Controller/Logic PCA defective.
Replace Controller/Logic PCA.
Read/Write PCA defective.
Replace Read/Write PCA.
Weak media spot on platter surface.
Determine sector{s) affected, spare the track{s).
24V supply out of tolerance.
Check voltage, adjust if necessary.
Motor wiring or connectors defective.
Check motor power connector at drive backplane. Verify proper connection.
24V supply defective.
Replace power supply.
Drive motor defective.
Replace Drive Sealed Mechanism.
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
Power Supply voltages intermittent.
Check dc power cable for continuity. If problem persists, replace power supply.
Controller unit address set incorrectly.
Set switches correctly.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Controller/Logic PCA defective.
Replace Controller/Logic PCA.
11. Sector destroyed during normal operation. A. BUSY LED lights and remains lit.
12. Motor speed varies.
A. N/A
13. Heads do not rezero after drive is turned on. A. BUSY LED lights and remains lit.
70
CORVUS DEALER SERVICE SYMPTOM
CAUSES
RECOMMENDED REPAIR
Read/Write PCA defective.
Replace Read/Write PCA.
Controller ROMs (3.xx and "! v'::) 0!"' C 0!",~!"0!!~!" ~C_A_ defective.
Replace Controller ROMS.
Drive Sealed Mechanism defective.
Replace Drive Sealed Mechanism.
Controller Firmware corrupted.
Update Firmware to latest revision. If problem persists, reformat the drive using Diagnostic FORMAT utility.
Front bezel sYJitches incorrect.
Verir/ correct setting of s,,~~tches.
Power Supply voltages out of tolerance.
Check voltages, adjust if necessary.
Power Supply defective.
Replace Power Supply.
Servo needs adjustment.
Adjust Servo electronics.
Servo PCA defective.
Replace Servo PCA.
Controller ROMs (3.xx and 4.xx) on Controller PCA defective.
Replace Controller ROMS.
Read/Write PCA defective.
Replace Read/Write PCA.
Boot ROM (where applicable) or Interface PCA defective.
Replace Boot ROM. If problem persists, replace Interface PCA.
14. Head oscillates after drive
is turned on. A. BUSY LED lights and remains lit.
71
CORVUS DEALER SERVICE
APPENDIX A GLOSSARY
CORVUS DEALER SERVICE
APPENDIX A GLOSSARY BACKPLANE OR MOTHERBOARD: four-slot printed circuit board which receives up to four of the drive electronics printed circuit boards. The RevA drive uses all four of these slots, while the RevB uses only three. The backplanes for the Rev A and RevB are not compatible and, therefore not interchangeable. BIT: single binary digit. Smallest representative unit of data, several of which make up characters (A-Z, 0-9, etc.). Bits may be either a one or a zero, on or off, set or reset. This may be shown by either a signal being present or not, or by a signal changing states or being constant. BLOCK: a relative quantity of data bytes. The Corvus disk defines one block to contain 512 bytes of data, the smallest addressable unit within the drive. The host operating system may define a block as 128, 256 or 512 bytes in length. Externally, since the disk drive handles data in sectors, no apparent conflict appears to the host system. BRAKE OR SOLENOID BRAKE: after power-down, before the motor speed has reached zero, so as to minimize contact time between heads and disk surface, the brake brings the platters to a stop. BYTE: any multi-bit digital value, usually eight bits long. The Corvus disk drives use eight-bit bytes. CABINET OR ENCLOSURE OR WHITE CABINET: the cabinet which contains the IMI drive mechanism, power supply and fan. The front and rear bezel attach to the cabinet basepan. A hinged access door in the bottom of the basepan allows access to the internal mirror PCA and drive electronics. CONTROLLER OR Z-80 CONTROLLOR OR INTELLIGENT CONTROLLER: the disk controller circuitry including the Z-80 microprocessor and support logic. In the RevB drives, this consists of the Controller/Logic PCA. CONTROLLER/LOGIC PCA: the Revision-B circuit board assembly containing the Z-80 controller and support logic. CORCOM: the rear bezel uint which accepts the power cord, and contains the line filter, line voltage PCB and fuse. CYLINDER: all data tracks in common vertical alignment. The 100megabyte drive has 358 concentric cylinders, the 20-megabyte drive has 388. There are three data tracks per cylinder for the 10-megabyte drive, and 5 for the 20-mega byte. DISK CONTROLLER PCA: the Revision-A circuit board assembly containing the master Z-80 processor, PIO ICs, as well as RAM and ROM memory. DISK MECHANISM OR SEALED MECHANISM: the IMI disk drive assembly consisting of platters, drive motor, head assembly and servo mechanism, all in a sealed environment covered by a translucent top assembly. The above components inside the sealed mechanism are not field-serviceable and the unit is not to be opened by any other than a Corvus factory facility, otherwise the warranty will be void. DMA OR DIRECT MEMORY ACCESS: method by which data is transferred at a very high rate, independent of the processor. The processor is put into a "wait" state, where it does no data manipulation. The DMA circuitry takes care of all details, using the Z-80 address bus for destination or origin address for data transfer. DVM: Digital Volt Meter. A meter used for measuring voltages, which shows output by means of a display consisting of changing digits, proportional to the voltage measured. FIRMWARE OR CONTROLLER FIRMWARE: Z-80code contained in the first two cylinders of the drive consisting of routines for the Spare Track Table, Constellation Network Table, and Semaphore Status Flags. The appropriate routines are downloaded from the Firmware into the on-board RAM for execution by the Z-80Controller at power-on time. FRONT BEZEL: the front panel of the white cabinet, containing the Paddleboard PCA and logo. GROUNDSTRAP: located at the lower end of the spindle in the drive sealed mechanism, the grounds trap consists of a copper metal strip terminating with a carbon button which rides on the spindle end. This device discharges any static charge which may build up on the platters or spindle. 72
CORVUS DEALER SERVICE HEAD: in the Winchester disk, very low-mass glass-ferrite, aerodynamic-shaped component, containing a wire winding. There is one head for each data surface. The heads float 18 microns above the platters on a cushion of air. When current passes through the winding, an electromagnetic flux is induced into the platter surface representing a bit. HEADSTACK: casting to which all heads are attached. Located in the top of the headstack is the microchip responsible for head selection and signal buffering. IC: Integrated Circuit. A hybred, densely populated wafer of silicon containing many resistors and transistors. MEGABYTE: one million bytes. MFM (MODIFIED FREQUENCY MODULATION): a method of writing information on a magnetic surface which allows a higher bit density to be used, therefore increasing storage capacity while decreasing size. MICROLOGIC PCA: the Revision-A printed circuit assembly which contains the master Z-80 processor and support logic. In later Revision-B drives, this circuitry was combined with the Drive Controller PCA to create the Controller /Logic PCA. NRZ (NON-RETURN TO ZERO): digital representation of information used by microprocessors. PADDLEBOARD: switches. PCA:
the small PCA located on the front bezeL which contains the three LEOs and four tunciivll
Printed Circuit Assembly. The Printed Circuit Board, assembled with all its components.
PCB: Printed Circuit Board. Epoxy board with a copper circuit etched into it. The PCB is the bare board without the usual components such as resistors, transistors and integrated circuits. PLATTER: eight-inch circular disks coated with a magnetic oxide that will retain a magnetic flux induced by the read/write heads. Both surfaces of each platter may contain data. The 10-megabyte drive has two platters, while the 20-megabyte has three. PREAMP: circuit responsible for initial amplification of analog signals. In the IMI drive, the first circuit downline from the headstack. In some drives, this is located on the underside of the drive mechanism, while later designs moved this to the Read/Write PCA. REAR BEZEL: the rear panel most area of the cabinet, containing the flatcable connectors for the interface cable, video connectors, power cable and fuse holder. The serial number is located on the rear bezel, also. SECTOR: each track is divided radially into 20 segments. Each segment is one sector, and contains one block of data, one CRC value, header information and tailer information required by the disk controller. SERVO PCA: the printed circuit assembly responsible for positioning the servo mechanism and the read/write heads over the appropriate track. SERVO MECHANISM: the device in the drive sealed mechanism which receives current from the servo electronics and positions the head stack. SINUSOIDAL WAVE: a wave form that represents periodic oscillations. TRACK: all points on one surface with the same radius. Tracks are configured concentrically on each surface. WINCHESTER TECHNOLOGY: a unique design first developed by IBM as a means to reduce the size of a disk drive while increasing its capacity and removing the possibility of contamination of the disk components. The result was a disk unit much smaller than the traditional l4-inch disk platters with equivalent capacity. This is due to new head design and the use of thp sea1ed-environment used with the disk drive which does net anew the external atmosphere inside the disk mechanism. Inherent in this design are heads that rest on the platters after the drive is powered off. The Corvus disk system uses International Memories Incorporated (IMI) Winchester disk drives. READ/WRITE PCA: the printed circuit assembly responsible for changing the data received from the heads in MFM format and converting it to NRZ format before passing it on to the Controller circuitry for manipulation.
73
CORVUS DEALER SERVICE
APPENDIXB PARTS LIST FOR EIGHT-INCH DRIVES
CORVUS DEALER SERVICE
APPENDIXB PARTS LIST FOR EIGHT-INCH DRIVES PARTS LIST FOR CORVUS 11MB/20MB DISK DRIVES PART NUMBER
DESCRIPTION
2400-01530 2400-01531 2400-01636 2600-01143 2600-01453 3010-08026 3150-01844 3150-01846 4000-01665 6010-01447 8010-08001 8010-08040 8010-08042 8010-08067 8010-08071 8010-08078 8010-08079 8010-08103 8010-08109 8010-08116 8010-08118 8010-08225 MISC.
BOTTOM PAN ONLY TOP COVER SUPPORT BRACKET, DRIVE MECHANISM FAN TORIN TA300 AC CORD FOR TORIN TA300 PCAMIRROR R. BEZEL ONLY F. BEZEL ONLY CP411 POWER SUPPLY, COMPLETE AC LINE CORD PCA PADDLEBOARD FLATCABLE, PADDLEBOARD-BACKPLANE FLATCABLE, INTERFACE (5 FT.) HARNESS, POWER SWITCH (4-WIRE) HARNESS, AC (CORCOM, SWITCH CON., P.S. CON.) FLATCABLE, MIRROR-DRIVE FLATCABLE, MIRROR-PROCESSOR 8" DRIVE BASE, COMPLETE (FAN, F. and R. BEZELS) F. BEZEL, COMPLETE (PADDLEBOARD, NAMEPLATE) MIRROR PHONO HARNESS (MIRROR HALF ONLY) R. BEZEL, COMPLETE (FLATCABLES, MIRROR HARNESS, CORCOM) FLATCABLE, REMOTE VCR HARNESS, MIRROR PHONO
7710 7720 310001 310101 310006 310176 310221 310071 310181 310156 310062 310021 330020 330092 330063
11MB DISK MECHANISM 20MB DISK MECHANISM R/W PCA w/o on-board preamp R/W PCA w/ on-board preamp Servo PCA, RevA, manual lock Servo PCA, RevA/RevB manual lock Servo PCA, RevA/RevB auto or manual lock Micrologic PCA, Rev A 11MB Micrologic PCA, Rev A 11MB Controller/Logic PC A, RevB 11MB/20MB Drive Controller PC A, Rev A 11MB Backplane PCA, 11MB/20MB (specify RevA or RevB) PROM, Micrologic, Rev A PROM, Micrologic, Rev A PROM, Micrologic, Rev A
Prices are to be found in the Corvus Dealer Service Administration Manual.
74
CORVUS DEALER SERVICE PCA PART NUMBER CROSS-REFERENCE ASSEMBLY NUMBER 310001 310101 310006 310176 310221 310071 310181 310156 310062 310021 330020 330092 330063
MFR. PART NUMBER
DESCRIPTION R/W PCA w/o on-board preamp R IW pr A \All
r,"_h{"l~rrl nro"' .......... c •... t" ~
~
Servo PC A, Rev A 11MB Servo PCA, RevA/RevB manual lock Servo PCA, RevA/RevB auto/manual lock Micrologic PCA, Rev A 11MB Microiogic PCA, Rev A 11MB Controller/Logic PC A, RevB 11MB/20MB Drive Controller PCA, Rev A 11MB Backplane PCA, Rev A/RevB 11MB/20MB PROM, Micrologic, Rev A PROM, Micrologic, RevA PROM, Micrologic, Rev A
811-01427-001 Q11
_
.........
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811-01428-001 811-01398-001 811-01368-X01 811-01441-001 811-01393-X01 811-01394-X01 811-01439-001 811-01431-X01 814-00549-002 814-00549-003 814-00549-004
In the future, the manufacturer will be silkscreening PCAs with new eleven-digit part number. Above is the cross-reference chart for assembly numbers (which should be used when ordering PCAs from Corvus) as well as the new manufacturers' part numbers. The "X" found in some manufacturers' part numbers refers to various revision level digits that may occupy that location.
75
CORVUS DEALER SERVICE
APPENDIXC PCA COMPATIBILITIES
CORVUS DEALER SERVICE
APPENDIXC PCA COMPATIBILITIES SERVOPCA REV A DRIVE MANUAL HEAD LOCK
REV A DRIVE AUTO HEAD LOCK
REVB DRIVE MANUAL HEAD LOCK
REVB DRIVE AUTO HEAD LOCK
asm 310176 (for use with micrologic PROM #330063)
asm 310221 (if used with micrologic asm3100n use PROM #330063) (if used with micrologic asm 310181, use PROM #330092)
asm 310176
asm 310221
asm 310006 (for use with micrologic PROM #330020)
asm 310221
asm 310221 (if used with micrologic asm 310071, use PROM #330063) (if used with micrologic asm 310181, use PROM #330092)
REV A DRIVE MANUAL HEAD LOCK
CONTROLLER PCA REV A DRIVE REVB DRIVE AUTO HEAD LOCK MANUAL HEAD LOCK
REVB DRIVE AUTO HEAD LOCK
asm 310161
asm 310161
asm 310156
REV A DRIVES MANUAL and AUTO HEAD LOCK
asm 310156
MICROLOGIC PCA REVB DRIVES MANUAL and AUTO HEAD LOCK
asm 310071
none
asm 310181 (see SERVO PCB COMPATIBILITY above for servo pcb and ROM restrictions)
READ/WRITE PCA REV A AND REV B DRIVES, MAUAL AND AUTO REV A AND REV B DRIVES, MANUAL AND AUTO HEAD LOCK, HAVING PREAMP PCB asm 310026 HEAD LOCK, HAVING PREAMP PCB asm 310131 (discreet circuitry) OR asm 310211 (traces only) asm 310001 (no on-board preamp)
REV A DRIVES
asm 310101 (with on-board preamp)
BACKPLANE/MOTHERBOARD PCA REVB DRIVES
asm 310021 (with Rev A jumpers installed on backplane)
REV A DRIVES
asm 310021 (with RevB jumpers installed on backplane)
PADDLEBOARD PCA REVBDRIVES
PCB has "REV A DRIVE 7710" etched onto it, three function switches and 10O-mil 34-pin flatcable connector
asm 7710/2OC asm 40010011 76
CORVUS DEALER SERVICE
APPENDIXD ASSEMBLY AND SCHEMATIC DRAWINGS
CORVUS DEALER SERVICE
LIST OF SCHEMATIC AND ASSEMBLY DRAWINGS Assembly Dwg, Metal Cabinet. . . . . . .. . . .. . . . .. Assembly Dwg, Detail . . . . . . . . . . . . . . . . . . . . . . .. Assembly Dwg, Front Bezel ................... Assembly Dwg, Rear Bezel. . . . . . . . . . . . . . . . . . .. Assembly Dwg, Wiring Harness/Corcom . . . . . . .. Assembly Dwg, AC Power Switch. . . . . . . . . . . . .. Assembly Dwg, Mirror Phono Harness ......... Assembly Dwg, Paddleboard PCA . . . . . . . . . . . . .. Schematic, Paddleboard PCA .................. Assembly Dwg, Paddleboard II . . . . . . . . . . . . . . . .. Schematic Dwg, Paddleboard II ................ Assembly Dwg, CP140 Power Supply. . . . . . . . . .. Schematic Dwg, CP140 Power Supply (1 OF 2) .. Schematic Dwg, CP140 Power Supply (2 OF 2) .. Schematic Dwg, CS100 Power Supply. . . .. . .. .. Assembly Dwg, CP411 Power Supply WIRING.. Assembly Dwg, CP411 Power Supply. . . . . . . . . .. Schematic Dwg, CP411 Power Supply (1 OF 2). .. Schematic Dwg, CP411 Power Supply (2 OF 2). .. Schematic Dwg, CP129 Power Supply (1 OF 3) Schematic Dwg, CP129 Power Supply (2 OF 3) .. Schematic Dwg, CP129 Power Supply (3 OF 3) .. Schematic Dwg, ASM 310001 (1 OF 4) . . . . . . . . .. Schematic Dwg, ASM 310001 (2 OF 4) .......... Schematic Dwg, ASM 310001 (3 OF 4) . . . . . . . . .. Schematic Dwg, ASM 310001 (4 OF 4) .......... Assembly Dwg, ASM 310001 . . . . . . . . . . . . . . . . .. Schematic Dwg, ASM 310101 (1 OF 3) .......... Schematic Dwg, ASM 310101 (2 OF 3) .......... Schematic Dwg, ASM 310101 (3 OF 3) .......... Assembly Dwg, ASM 310101 .................. Schematic Dwg, ASM 310221 (1 OF 3) .......... Schematic Dwg, ASM 310221 (2 OF 3) .......... Schematic Dwg, ASM 310221 (3 OF 3) .......... Assembly Dwg, ASM 310221 . . . . . . . . . . . . . . . . ..
78 79 80· 81 82 83 84 85 86 87 88 89 90 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
Schematic Dwg, ASM 310176 (1 OF 3) .......... Schematic Dwg, ASM 310176 (2 OF 3) . . . . . . . . .. Schematic Dwg, ASM 310176 (3 OF 3) . . . . . . . . .. Assembly Dwg, ASM 310176 . . . . . . . . . . . . . . . . .. Schematic Dwg, ASM 310006 (1 OF 3) .......... Schematic Dwg, ASM 310006 (2 OF 3) .......... Schematic Dwg, ASM 310006 (3 OF 3) .......... Assembly Dwg, ASM 310006 . . . . . . . . . . . . . . . . .. Schematic Dwg, ASM 310071 (1 OF 3) .......... Schematic Dwg, ASM 310071 (2 OF 3) . . . . . . . . .. Schematic Dwg, ASM 310071 (3 OF 3) . . . . . . . . .. Assembly Dwg, ASM 310071 . . . . . . . . . . . . . . . . .. Schematic Dwg, ASM 310181 (1 OF 3) .......... Schematic Dwg, ASM 310181 (2 OF 3) . . . . . . . . .. Schematic Dwg, ASM 310181 (3 OF 3) . . . . . . . . .. Assembly Dwg, ASM 310181 .................. Schematic Dwg, ASM 310061 (1 OF 8) .......... Schematic Dwg, ASM 310061 (2 OF 8) . . . . . . . . .. Schematic Dwg, ASM 310061 (3 OF 8) .......... Schematic Dwg, ASM 310061 (4 OF 8) . . . . . . . . .. Schematic Dwg, ASM 310061 (5 OF 8) .......... Schematic Dwg, ASM 310061 (6 OF 8) .......... Schematic Dwg, ASM 310061 (7 OF 8) .......... Schematic Dwg, ASM 310061 (8 OF 8) .......... Assembly Dwg, ASM 310061 . . . . . . . . . . . . . . . . .. Schematic Dwg, ASM 310156 (1 OF 4) .......... Schematic Dwg, ASM 310156 (2 OF 4) . . . . . . . . .. Schematic Dwg, ASM 310156 (3 OF 4) . . . . . . . . .. Schematic Dwg, ASM 310156 (4 OF 4) .......... Assembly Dwg, ASM 310156 ... . . . . . . . . . . . . . .. Schematic Dwg, ASM 310021 (For Rev A Drives) ......................... Schematic Dwg, ASM 310021 (For Rev B Drives) .......... ~ ..............
77
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
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CORVUS DEALER SERVICE
INDEX
CORVUS DEALER SERVICE Add-on drive cable 2.5
Groundstrap
Backplane/Motherboard 4.6.5, 5.6 Block, data 4.5 Boot image 9.5.4.1 Boot procedure 4.6.6 Brake 4.6, 7.5, 7.6 Burn-In program 8.5, 9.5.2, 9.6.8 BUS DIRECTION signal 5.5.1
Handling, shipping 2.3 Headlock 2.3.1, 4.6.3, 9.6.1 Heads, R/W 1.6, 4.5, 4.6.2 IBMDOS 9.5.4.8 Initialization, drive 9.5.4.8 Installation 2.4 Interface cable 2.4 Interface PCA 5.9, 9.5.3.2, 9.5.4.7 Interleaving Specification 4.6.2
Card cage 1.5 Carriage lock 1. 5 CCOS Operating System 9.5.4.8 CATALOG command 9.5.4.8 Chip (IC) 2.3 Connectors 5.6 Constellation Parameters 4.6.1 Controller diagnostics 8.4 Controller Firmware 3.3.2, 4.6.1, 9.5.4.5 Controller/Logic PCA 4.6.5, 5.5, 5.5.2, 5.5.3, 9.5.3.4 Control signals 5.5.1 Cooling 2.4 CORCOM 2.4, 3.5.2, 4.3.3 CP/M 9.5.4, 9.5.4.8 CRC 5.5, 5.5.3, 8.3.1, 9.5.4.3, 9.6.2, 9.6.6 Cylinder 4.5
LEOs, front bezel 2.4, 3.3.1, 9.5.1 Link software 9.5.4 Logical drives 2.5 Metal package, disassembly 6.3 MFM 5.4 Microchip 4.6.2, 5.4.2, 9.5.3.6 Micrologic PCA 4.6.5 MIRROR 1.3, 1.4.2, 9.6.4 Motor, dc drive 4.6, 9.5.3.6 Networks, local 9.5.2 NEWDOS Operating System Noise, electrical 3.5.2 audible 3.6.1 NRZ 5.4
Daisy-chaining of drives 2.5 Damage, shipping 2.3 Data bus 5.5.3 Diagnostic test 2.3.2 Directory 9.5.4.8 DMA 5.5.3 DOS 9.5.4 Drive diagnostics, REV A 8.8 Drive diagnostics, REV B 8.3 Drive error 9.5.4.1 Drive mechanism 3.6, 4.6, 9.5.3.6 Drive parameters 2.3.2
9.5.4.8
OMNINET local network 3.4 Paddle board 5.8 PES signal 5.3.1, 5.3.2, 7.4.1 PIO, Z-80 5.5 Platters 1.5, 4.6 POSITION MODE signal 5.3, 5.3.2, 7.4.1 Power cable 4.4 Power fail 5.3 Power-on sequence 3.4, 9.5.3.2 Power, quality of 3.5.2 Power supply 1.4.1, 4.3, 7.3, 9.5.3.3, 9.5.4.2, 9.6.7 CS100 4.3.1, 7.3.2 CP129 4.3.2, 7.3.3, 9.5.3.3 CP140 4.3.3, 7.3.1 CP411 4.3.4, 7.3.1 Preamp 4.6.4, 5.7, 9.5.3.6 Processor port 5.6
Electronics, drive 6.5, 9.5.3.5 Environmental requirements 3.5 Error codes 9.4 Fan 4.6 Format, bottom-level (diagnostic) data 5.2 Fuse 2.4, 9.5.3.3
3.6.1
3.3.2
144
CORVUS DEALER SERVICE TARGET VELOCITY 5.3.3 Temperature 3.5.3 Tools 6.2.1, 9.3 Track 4.5 Track diagnostic program 8.7 Tri-Rit siQnal 5 . .1.1 Troubleshooting 9.1, 9.5
RAM, Controller 3.3.2, 4.6.6 Read amplifier 9.5.4.2 Read procedure 5.4.1 ReadlWrite PCA 4.6.4, 5.4, 5. '7, 9.5.4.2 Receiving a drive 2.3 Relative humiditv 3.5.1 Reset line 5.5.1, 9.5.3.4, 9.6.5 Return code 5.5 Revision (A, B) L2, L5, 4.6.5 ROM, Controller 4.6.6 Boot 5.9, 9.5.4.6
UCSD Pascal
9.5.4.8
VDO Tabie 2.3.2 Voicecoil, servo 4.6.2 Voltage, ac 2.4, 9.5.3.3 Voltage, dc 3.6.1
Seal, drive mechanism 4.6.2 Sector 4.5 Seek mode 5.3 Self-test 3.3.2, 4.6.6 Semaphore status flags 4.6.1 Servo 3.6.1, 5.3, 5.3.3, 7.4, 7.4.2, 9.5.3.5, 9.5.4.4, 9.6.3 Adjustment 7.4.1 PCA 4.6.5 Servo tracks 5.3.1, 9.5.3.6 Spare track table . 2.3.2, 4.6.1, 9.5.4.3 Stand-alone drives, disassembly 6.4 Static electricity 3.5.1 Status byte 5.5.3 STROBE 5.5.1 Switches, front bezel 2.4, 3.3, 3.3.2, 4.6.6 power 2.4 unit address 2.5
Warm-up time 3.5.3 Winchester drive L5, L6, 3.6, 4.6 Write procedure 5.4.2
145
~~orvus
Systems, Inc./21 00 Corvus Drive / San.::400e, California 95124/ (408) 559-7000 / Telex 278976 ',.:.-
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