2120 Troubleshooting Aid

Transcript

S@Simplex 2120 Multiplex Troubleshooting Aid 7 MUX2-61-007 Ed987 GENERAL TROUBLESHOOTING NOTES: 1. ALWAYS CHECK POWER SUPPLY TROUBLES FIRST. 2. Always remove power (batteries & AC) before changing parts. 3. Troubles take a few seconds to clear. BE PATIENT. BMUX TROUBLE MESSAGES Note: BMUX test points are shown in Figures 1 through 3. . TBL 01 IN SYSTEM ABN POINTS ARE DISABLED - l This indication is normal if you have disabled points for troubleshooting before leaving system. TBL 02 IN SYSTEM ABN MN PWR LOSSGND - purposes. Re-enable points DET (MAIN POWER LOSS/GROUND DETECT) Check yellow power supply LED. If on: Check for grounds on DC lines. Isolate ground to + or - side by checking between chassis to OV or 24V supply terminals. Chassis to OV = 12V; chassis to 24V = 12V; chassis to 30V = 15V (approximate values). Check communication channels for grounds by disconnecting comm lines at DC transmission boards. Do one channel at a time. If yellow power supply LED goes out, ground is on that channel. Check all ADDS terminals, TermiNets, and printers. Ensure that 3-to-2 adaptor is present on AC plug if 562-047 RS232C board is used. Correct if needed. - If yellow power supply LED is OFF, check the following: Check AC input at TBl-1 and TBl-2 on the AC I/O board. Correct if needed. Ensure that Kl relay is picked. ‘Adjust brown out circuit if necessary. (See Figure 4.) Note that Kl also drops out if 24VDC exceeds 30VDC. Check BMUX power supply fuses, including in-line battery fuse. Verify that battery harness loop is not open. Check outputs of power converter board. Replace power supply if fuses, converter board, and battery harness check out OK. . TBL 03 IN SYSTEM ABN SERVICE DIAGNOSTICS - Occurs when you are using 2120 Diagnostics. Be sure to turn diagnostics OFF after all troubleshooting activities are done. . TBL 04 IN SYSTEM ABN LOC PRTR PAPER LOW (LOCAL PRINTER PAPER LOW) l - Check printer paper. - Verify that printer side panel is secure. - If paper and side panel are OK, check printer microswitch and wire between microswitch and controller board. TROUBLE LOFAIL (Local Printer Failure) - Check across Cl5 on printer controller board. For TI printers (P/N 616-684) rated voltage is 18V. For Gulton printers (P/N 616-877) rated voltage is listed on printer label (from 15.1 to 17.2V). If level is too low, adjust R23 on printer controller board until rated voltage is present. THE VOLTAGE ACROSS Cl5 MUST NEVER EXCEED PRINTER’S RATED VOLTAGE! ALSO, BE CAREFUL WHEN CHECKING VOLTAGE ACROSS Cl5 TO AVOID SHORTING VOLTAGE TO PRINTER CONTROLLER BOARD ETCHES. 1 - Check harness between BMUX motherboard and printer controller board. Replace if needed. - Other possible problems include: Bad printer controller board. Bad RS232C board. . TROUBLE REMOTE DEVICE - (2 to 6) FAIL - Check switch settings on RS232C boards. Correct if needed. - If port is supervised, check remote device as follows: Verify that power is present. Verify that RS232C connector is in place. Check RS232C cable. Check device. - Other possible problems: Bad RS232C board. Bad CPU board. w (5 volt@ (30 vow m w (24~) (X, 24c) -side of Cl by hest sync + side of Cl by beet sync 2 1 P2-6 I motherbd. 1 AIC Low P2-7 motherbd. 2 P2-6motherbd. P2-6momerbd. 3 P2-5 nlomrw. 4 P2-4motherm. P2-4motherM 5 notueed 6 P2-2 motherbd. 7 not used 1 (24~) 2 (5 votle) 3 (24 volts) P6-2 A.C. input bd. -skleofbettsry 2 (24 volts) +sldeof 3 bettely P6-1 AC. lnpul bd. M. P2 POWER SUPPLY BOARD 601-467 P/N 562-076 OR 601-611 P/N 562-520 1 (24 VC) (24 VC) P3 6 (24 VC) 2 P4 4 (27.6 vob) Pl 5Ii 6 BMUX Power Supply Board Outputs FIGURE 1 2 General BMUX Troubleshooting Notes 1. Check for presence of DC operating voltages at 24V, W, and OV test points on upper right corner of front panel display board. 2. Disconnect power when replacing PC boards by: A. Disconnecting batteries first. B. Disconnecting AC last. 3. Check comm lines for shorts by removing connector on DC transmission board and checking the following AC I/O board terminals: Channel 1 A ( - ) at TB3-22 Channel 2A ( - ) at TB3-17 Channel 1A ( +) at TB3-21 Channel 2A ( + ) at TB3-16 Channel 1 B ( -) at TB3-24 Channel 28 (- ) at TB3-19 Channel 1 B ( + ) at TB3-23 Channel 28 ( + ) at TB3-18 12 POS MOTHERBOARD 661-513 PiNs 662-167 or 662-: P2 1 not ussd 2 (SVC, WVC) 3 IlOtUSd 4 (24 volts) P3-5 Power Supply Bd. 6 WVC) (30 volts) P3-4 Power Supply Bd. 7 (6 volta) P3-2 Power Supply Bd. 6 (A.CJLow) P3-1 Power Supply Bd. 6 P3-7 Power Supply Bd. P3-3 Power Supply Bd. 9 10 J NOTE: Pl Ribbon Cable connects to the front penel Display Bd. BMUX Motherboard Voltage Inputs FIGURE 2 P3-1 P3-2 (24VC) To Sonelett (6voits) P2-3 On Power Supply Bd. P3-3 P34 (24 volts) P2-2 On Power Supply Bd. (66 24VC) P2-1 On Power Supply Bd. P3-6 P3-6 (SVC) To advance switch on printer bd. NotUsed P3-7 P3-6 Not Used (5 volts) To advance ewltch on prlnter W: Printer Controller Board Voltage Inputs FIGURE 3 3 COMMUNICATION CHANNEL TROUBLE MESSAGES o TBL 01 CHANNEL (1 or 2) ABN CHANNEL NOT XMITTING - If CHANNEL HAS FAILED message is also reported, troubleshoot CHANNEL NOT XMITTING first. - Check switch settings on affected transmission board. - Check switch settings on CPU board. - Check for presence of 30V to the DC transmission board. Check at TBl-1 (OV) and TBl-2 (30V) on the low power converter board. If 30V is not present, and no power supply troubles have been reported, then replace the low power converter board. - Other possible problems: Bad DC transmission board. Bad CPU board: ADJUSTMENT 1. Locate PROCEDURE R2, R8, R12, and R20. 2. Remove batteries first, then AC. 3. Disconnect connectors 4. Reconnect AC power ONLY. 5. Adjust -R2 -R29 R12 fully clockwise. 6. Connect 7. Adjust ! P2, P3, and P5. VOM across RED (+) and BLACK (0 volts) battery connectors. R8 until VOM reads 26 volts. 8. Connect VOM across top of R2 (+) and BLACK (0 volts) battery connector. 9. SLOWLY adjust R12. At some point, the voltage reading on the VOM will suddenly drop from about 33 volts to around 9 volts. This is the TRIP POINT. Stop at this point. 10. Now, SLOWLY adjust R8 counterclockwise until VOM reading trips back to about 33 volts. Stop at the trip point. 11. Connect 12. Adjust -R8 -R12 VOM as in Step 6 above. R8 until VOM reads about 27 volts. -R27 13. Remove AC power. 14. Carefully reconnect 15. Reapply AC Power. 16. Reconnect CAUTION: the connectors removed in Step 3. BMUX Power Supply Adjustment FIGURE 4 batteries. Be extremely careful when performing the following steps. 17. Connect VOM across P6-1 (-) and P6-2 ( + ) on the power supply or TB2-1 ( + ) and TB2-2 ( -) on the AC I/O board. 18. Adjust R20 on the power supply until VOM reads 24 volts. 19. Apply 102VAC to 12OINEUT terminals. Adjust R27 until relay Kl de-energizes. Then apply 106VAC and adjust R27 until relay Kl energizes. Note: 102VAC can be obtained by building a variable AC supply. Use a standard power cord and a variable transformer (P/N 478-187). Do not adjust R27 unless you have a variable AC supply. 20. Apply normal power to BMUX. 4 l TBL 02 CHANNEL (1 or 2) ABN CHANNEL HAS FAILED Note: - More than one transponder may be causing trouble. If CHANNEL NOT XMITTING was also reported: A. Disconnect affected channel at DC transmission board. B. If CHANNEL NOT XMITTING message clears, look for: Short on affected channel. Use half-splitting to find the short. Check DC transmission board. Replace if necessary. Check CPU board. Replace if necessary. - If CHANNEL NOT XMITTING was not reported as well: A. Check harness from DC transmission board to AC I/O board. Ensure connectors are fully seated. Replace harness if necessary. B. Look for a bad transponder (could be shorting the comm lines). Use half-splitting to break affected comm line at a selected transponder. If CHANNEL HAS FAILED message does not clear after breaking the comm line, affected channel segment is electrically CLOSER to the BMUX. Continue half-splitting to locate the affected segment and transponder. If CHANNEL HAS FAILED message clears after breaking the comm line, then you have isolated the affected channel segment. Continue half-splitting on that segment until you’ve located the bad transponder. When you find the bad transponder, check at microprocessor pin 1 to OV. If level is constantly high or missing, replace controller board. Otherwise, replace microprocessor. Note: If both channels are reported with CHANNEL HAS FAILED and CHANNEL NOT XMllTlNG warm start the BMUX. messages, BT/FABT TROUBLE MESSAGES Note: In the following trouble messages, “XXX” refers to the channel and transponder number. Also, in mid-l 985, the BT/FABT power supply was replaced by the ET power supply. Check to see which power supply is used before troubleshooting. . TBL 01 XPNDR XXX POWER FAIUGND FAULT - Locate the specified transponder and its power supply. If the yellow power supply LED is on: Check from chassis to OV and from chassis to 28V to isolate ground on + or - side. Chassis to OV = from OV to 4V if ground on - side. Chassis to 28V = from 23V to 28V if ground on + side. Disconnect batteries. If trouble clears, replace batteries. Check all monitored circuits for presence of ground. Check all supervised control circuits for presence of ground. Check DC line for presence of ground. If previous tests are OK, replace power supply board. - If yellow power supply LED is off: Check AC input at power supply. Correct if needed. Check power supply fuses and battery harness in-line fuse. 5 Check all harnesses from power supply to batteries and transponder. seated. Ensure connectors are fully Check between P3-5 (+) and OV. If level is greater than 30VDC and cannot be adjusted down using R21, replace transistor Q2. Verify DC output of rectifier at P3-1 (+) and P3-2 (-) missing. of power supply. Replace rectifier if output Ensure that relay Kl is picked. Adjust brown out circuit if necessary. (See Figure 5.) Note that Kl also drops out if 24VDC exceeds 30VDC. If previous tests are OK, replace power supply board. o TBL 02 XPNDR ABN XPNDR COM FAILED PRI (TRANSPONDER - COMMUNICATION FAILED PRIMARY) If trouble reported for only one transponder (regardless of whether comm line is McCulloh loop): Go to indicated transponder. Check transponder DIP switch settings. ADJUSTMENT PROCEDURE 20. Apply 102VAC to lPO/NEUT terminals. Adjust R27 until relay Kl de-energizes. Then apply 106VAC and adjust R27 until relay Kl energizes. NOTE: Protective cardboard power supply cover must be removed to access components. Note: 1. Locate R2, R6, and R15. 2, Remove batteries first, then AC. 3. Disconnect connector Pl. 4. Reconnect AC power ONLY. 102VAC can be obtained by building a variable AC supply. Use a standard power cord and a variable transformer (PIN 476-187). Do not adjust R27 unless you have a variable AC supply. 21. Apply normal power to BMUX. 5. Adjust R15 fully counterclockwise. 6. Connect VOM across the RED (+) and BLACK (0 volts) battery connectors. -c -: 7. Adjust R6 until VOM reads about 26V. 8. Connect VOM across top lead of R2 (+) and BLACK battery connector (0 volts). 9. SLOWLY adjust RlS. At some point, the voltage reading on the VOM will suddenly drop from about 33 volts to around 10 volts. This is the TRIP POINT. Stop at this point. 10. Now, SLOWLY adjust R6 clockwise until VOM reading trips back to about 33 volts. Stop at the trip point. 11. Connect VOM as in Step 6 above. VOM should read about 28 12. Readjust R6 until VOM reads about 27.6 volts. 13. (To adjust 28V supply output) Connect VOM across TBl-1 (+ ) and TB 14. Adjust R21 until VOY reads about 28 volts. .15. Remove AC power. 16. Reconnect connector Pl . 17. Re-apply AC power. 18. Reconnect batteries. 19. Replace protective cardboard power supply cover. NOTE: To adjust power supply for NO BATTERIES, adjust BOTH R6 and R15 FULLY COUNTERCLOCKWISE. BT/FABT Power Supply Adjustment FIGURE 5 6 Check level at pin 1 of microprocessor (reference to OV). lf level is missing, check fuse Fl. If fuse is good, replace controller board. lf level is constantly high, replace controller board. If /eve/ is not missing, replace microprocessor. lf /eve/ is not constantly high, replace microprocessor. Replace controller board if replacement microprocessor - does not clear the trouble. If trouble reported for more than one transponder: Find lowest transponder number of comm failures. Open in comm line is electrically ahead of transponder you located. Isolate and repair open. - If comm lines are McCulloh loop and trouble reported for more than one transponder: Find lowest transponder Find highest transponder number of PRI comm failures. number of SEC comm failures. Open is between the two transponders you located. Isolate and repair open. . TBL 03 XPNDR XXX ABN XPNDR COM FAILED SEC (TRANSPONDER SECONDARY) - General . COMMUNICATION FAILED Follow McCulloh loop information under “TBL 02 XPNDR COM FAILED PRI” above. BT/FABT Troubleshooting Notes 1. Check AC or BT/FABT power supply at TB2-1 and TB2-2. 2. Check monitor point wiring for opens and shorts between “-” side of zone and OV. If voltage = OV, then zone wiring is open. /f voltage = 24\/, then zone wiring is shorted. 3. Remove power when replacing boards by: A. Disconnecting batteries first. B. Disconnecting AC last. 4. Restore power after replacing boards by: A. Connecting AC first. B. Connecting batteries last. ET TROUBLE MESSAGES . TBL 02 XPNDR XXX ABN XPNDR COM FAILED PRI - If trouble reported for only one ET (regardless of whether comm line is McCulloh loop): Go to indicated ET. Press reset switch (SW5) and wait 15 seconds. If trouble does not clear, proceed. Check all jumper placements and switch settings on ET CPU board. Correct if needed. On ET CPU board, check from TBl-5 (OV) to pin 2 of IC18 (i). lf level is pulsing, check for bad daughter card by half-splitting. If no cards are bad, check IC2 through IC9 for bent pins or improper seating. If IC2 through IC9 OK, replace microprocessor. Replace ET CPU board if replacing microprocessor does not clear trouble. lf /eve/ is OV, remove all daughter cards and check again. If level is still OV; replace microprocessor. Replace ET CPU board if replacing microprocessor does not clear trouble. If level is something other than OV after removing all daughter cards, then check for bad daughter cards by half-splitting. 7 - If trouble reported for more than one ET, or for one or more ETs and other transponders, troubleshoot per “TBL 02 XPNDR COM FAILED PRI” under BT/FABT troubles section. . TBL 03 XPNDR XXX ABN XPNDR COM FAILED SEC - Follow McCulloh section. loop information under “TBL 02 XPNDR COM FAILED PRI” in BT/FABT troubles e TBL 04 XPNDR XXX ABN XPNDR HAS WRONG CARD - Go to indicated ET. - Check all daughter card switch settings. - If daughter card switch settings OK, replace ET CPU board. TBL 06 XPNDR XXX ABN POWER/BATTERY l - Go to indicated ET. - Verify that AC is present. Correct if needed. - Check power supply fuses Fi , F2, and F3. Replace if needed. - Check battery harness and in-line fuse. - Ensure that relay Kl is picked. Adjust brown out circuit if necessary. (See Figure 6.) Note that Kl also drops out if 24VDC exceeds 30VDC. ADJUSTMENT CAUTION: NOTE: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. FAIL To be performed PROCEDURE by Simplex personnel only. Protective cardboard cover over power supply removed to access components. must be Locate R2, Pl, R15, R6, and R21. Remove batteries first, then AC power. Disconnect connector Pl. Reconnect AC power only. Adjust R15 fully clockwise. Connect VOM across the RED (+) and BLACK (0 volts) battery connections. Adjust R6 until VOM reads about 26 volts. Connect VOM across left side of R2 (+) and BLACK battery connector (0 volts). SLOWLY adjust R15. At some point, the voltage reading on the VOM will SUDDENLY DROP from about 33 volts to around 10 volts. This is the TRIP POINT. Stop at this point. Now SLOWLY adjust R6 clockwise until VOM reading trips back to about 33 volts. Stop at this point. Connect VOM as in Step 6 above. VOM should read about 28 volts. Re-adjust R6 until VOM reads about 27 volts. Connect VOM across TBl-1 (+) and Tel-2 (-) Adjust R21 until VOM reads 28 volts. Remove AC power. Reconnect connector Pl. Re-apply AC power. Reconnect batteries. Replace protective cardboard cover over power supply. ET/CDT Power Supply Adjustment FIGURE 6 8 - Check voltage between P2-1 ( + ) and P2-7 ( - ) on the power supply. If /eve/ is between 30 and 4OVDC, then check voltage between P2-3 (+) and P2-5 (-) on power supply board. If level is between 30 and 40VDC, replace transistor Q2 on heat sink assembly. If level is other than 30 to 40VDC replace power supply board. /f/eve/ is not between 30 and 4OVDC, then replace the power supply assembly. TBL 07 XPNDR XXX ABN GROUND FAULT l - Go to indicated ET. - Disconnect batteries. If trouble clears, replace batteries. - Check from chassis to OV and from chassis to 28V to isolate ground on + or + side. Chassis to OV = from OV to 4V if ground on - side. Chassis to 28V = from 23V to 28V if ground on + side. If ground on OV side, remove any fire alarm digital I/O boards in ET. Then, check between TP3 (+) and TP6 (OV) on power supply board. If /eve/ is less than or equal to 3V, then there are no grounded .monitor points. Check ET CPU board for edges on protruding pins that could be grounding out: Replace if necessary. If CPU board OK, replace power supply board. If /eve/ is greater than 3V, then there is a ground on a monitored circuit. Use half-splitting to isolate the affected card. During half-splitting, check between TP3 (+) and TP6 (OV) on power supply board. When level is 3V or less, you have located card that supports affected wiring. TBL 08 XPNDR XXX OPEN LINE LOC SWITCH l - Go to indicated ET. - If ET is equipped for local detector reset and signal silence, check wiring on following power converter board terminals for opens: TBl-11 and TBl-14 I TBl -12 and TBl -14. Repair if necessary. - If ET is not equipped for local detector reset and signal silence, ensure that a 47K-ohm, %-watt resistor is across each of the following terminals. TBl-11 and TBl-14 TBl -12 and TBl -14 CDT TROUBLE l MESSAGES TBL 01 XPNDR XXX LOCAL LOOP COMM FAIL - Go to indicated CDT. - Check fuse Fl on CDT board. - Check SW2 to ensure that one device is being polled. - Check MAPNET connections Repair if necessary. - Check for MAPNET open between CDT panel and first device. Repair if necessary. Check for MAPNET short. - Replace CDT panel if previous checks are OK. at CDT panel terminals and at contractor terminals in CDT panel cabinet. 9 . TBL 02 XPNDR XXX XPNDR COMM FAILED PRI - Use same techniques for BT/FABT/ET comm failures. . TBL 03 XPNDR XXX XPNDR COMM FAILED SEC - Use same techniques for BTIFABTIET comm failures. . TBL 04 XPNDR XXX IMPROPER SLOT CONFIG - Go to indicated CDT. - Check all CDT panel switch settings, particularly on DIP switch package SW2 and switches 1 through 7 on DIP switch package SW3. RESET THE CDT PANEL AFTER CHANGING SWITCH SETTINGS. . TBL 05 XPNDR XXX LOCAL LOOP MCCULLOH - l l The MAPNET loop on the indicated CDT has switched to Class A operation because of an open line. Go to the indicated CDT and check the MAPNET for opens. TBL 06 XPNDR XXX POWER/BATTERY FAIL - fail troubles. Follow procedure for ET power/battery TBL 07 XPNDR XXX GROUND - FAULT Follow procedure for ET ground fault troubles. . TBL 08 XPNDR XXX OPEN LINE LOC SWITCH - Follow procedure for ET open line lot switch troubles. General CDT Troubleshooting Notes 1. Check switch settings carefully. 2. Since CDT device switch settings are critical, 100% installation checkout is a MUST. 3. When checking CDT panel switch settings, be sure to check DIP switch packages SW2 and SW3, which tell the panel how many monitor and control devices are on the MAPNET. If set for too many devices, then device troubles will be reported for the devices that aren’t out there. RESET CDT PANEL SWITCHES, THEN WARM START BMUX. lf set for too few devices, the error will only show up on checkout. So, CHECKOUT CDT DEVICES 1 OO%! 4. Double-check so. device addresses with their locations during installation, or make sure contractor knows to do 5. MAPNET failures (LOCAL LOOP failures): If all devices are ZAMs, then check ZAM power supply (same as ET/CDT power supply). Remove 24VDC from all ZAMs on MAPNET, then check MAPNET w/VOM at CDT panel terminals (A + ) and TB2-5 (A - ) (about 30VDC). TB2-4 6. Check jumpers on CDT panel. 7. If the CDT is reporting toggling points, then there is a MAPNET problem (line not terminated, hanging loose, or too long). Check t-taps, end of line, branches. Verify that MAPNET does not exceed recommended length. 8. CDT fuse Fl is 400 mils 9. MAPNET device in trouble - a critical value. If MAPNET is not working check fuse first. check zone wiring if monitor ZAM; check signal circuit wiring if signal ZAM. 10 10. Remember: CDTs use two transponder addresses, even though we set only the lower address via switches. XPNDR COMM FAILED PRI and SEC messages will be reported for both CDT addresses. However, other troubles report only on the lower CDT address. SCC TROUBLE l l MESSAGES TBL 01 XPNDR XXX POWER FAIUGND FAULT - Troubleshoot per BT/FABT POWER FAIL/GND FAULT information. - Check fuse Fl on converter board (562-212). If power and fuse are OK, replace converter board. See Figure 7 for converter board terminals and fuse location. TBL 02 XPNDR XXX XPNDR COM FAILED PRI - Troubleshoot per BT/FABT COM FAILED PRI. - Replace SCC controller board if other fixes do not work. TBL 03 XPNDR XXX XPNDR COM FAILED SEC l - Troubleshoot - Replace SCC controller board if other fixes do not work. Note: per BT/FABT COM FAILED SEC. If communication failure is on upper address of a double SCC, ensure that one row of switches is programmed into the EAROM (IC3). Note that the first row of switches on the second address is the ninth row of switches on the SCC. -*--nsnC (14 FUSE Fl ML OV(Pl-l)--l-it?I 1’1 I’ 5VDC (Pl-2) (SEE NOTE) 30VDC (Pl-9) and - 12VDC (Pl-10) TEST POINTS u 01 NOTE: 5VDC ONLY PRESENT ON SCC WRITE. SCC Converter Board Test Points and Fuse Locations FIGURE 7 l TBL 04 XPNDR XXX XPNDR HAS WRONG CARD - Go to indicated SCC. - Check SCC address. - Verify that modules are in proper positions. Correct if necessary. - Verify that SCC does not have IC3 programmed for more switches then the BMUX is looking for. Correct (if necessary) by doing a “SCW D” for all additional switch locations. - If modules OK, replace SCC controller board. 11 o TEL 05 XPNDR XXX ABN SCC BRODCASTING - FA3:L Possible causes:, Bad Bad Bad Bad EAROM. SCC controller board. fuse Fl on SCC converter. board or bad converter board. DC transmission board. General SC@ Troubleshootiqg Notes 1. If SCC LEDs are unstable after yoti apply power to system, operate SCC reset switch (Sl on controller board) for three seconds to stabilize, display. If that doesn’t clear problem: o Check that controller. board, control module, and converter board are compatible per Note 4 below. o Check that ail SCC modules are in their proper positions, assigned to the proper expansion board, and are interconnected properly. o Check SCC program; Ensure that points identified as switches are actually switches. Correct if necessary. If problem is only on one group of modules, replace associated expansion board. : e If problem is on more than one group of modules: l Check SCC program. Replace EAROM and reprogram SCC. If SCC program and replacement EAROM do not clear trouble, replace SCC controller board. 2. Isolate troubles to SCC controller board or IC5 by checking pins on IC.5: @ Check pin 20 to OV (level should be from 1.5 to 7.5V). Set VOM on 3VDC scale. If level at pin 20 is missing, check input to SCC at comm lines on converter board (TBl-2 is “+ “; TBl-1 is “-“). If level is present on lines, then there is a controller board problem. If level on pin 20 appears OK, check pin 25 to OV (should be a constant 5V). If level is missing, IC5 is bad and must be replaced. 3. Ensure all SCC harnesses terminate at proper locations. All harnesses should make good connections at end connectors, and all connectors should be properly aligned. 4. SCC controller boards (562-184) following sets: control modu!es (562-210) and converter boards (562-212) match up in the (i 562-184, Rev. A through F 562-210, Rev. A through D 562-212, Rev. A through:F Q 562-184, Rev. G 562-210, Rev. F or G 562-212, Rev. F+ or G e 562-184, Rev. Jl 562-210, Rev. F or G 562-212, Rev. H Use this list when replacing boards to ensure compatibility. 12 I aaSimplex Ed 9 87 Simplex Time Recorder Co., l Simplex Plaza l Gardner, Massachusetts 01441 U.S.A. MUX2-61-007 1