Transcript
321-78160 Oct, 2014
SERVICE MANUAL for Electronic Balance BW-K/BX-K Series
Read the instruction manual thoroughly before you use the product. Save this instruction manual with care so that you can use it any time you need it.
SHIMADZU CORPORATION Analytical & Measuring Instruments Division Kyoto, Japan
CONTENTS
1.
OPERATION METHOD FOR ADJUSTMENT SERVICE ...................................... 1 1.1
How to Enter into the Service Menu .......................................................................... 1
1.2
Contents of the Service Menu .................................................................................... 1
2.
HOW TO INSPECT THE BALANCE INSIDE.......................................................... 2
3.
HOW TO REPLACE THE PARTS ............................................................................ 5 3.1 Replacing Main Board Assembly............................................................................... 5 3.2 Replacing Power Board Assembly ............................................................................. 6 3.3 3.4
Replacing Switch Board Assembly ............................................................................ 7 Replacing Unit Assembly........................................................................................... 7
3.5
Replacing Force Cell .................................................................................................. 8
4.
5.
ADJUSTMENT OF THE BALANCE ......................................................................... 13 4.1
Height Adjustment of Detector Assembly ................................................................. 13
4.2
Balance Adjustment ................................................................................................... 13
4.3
Adjustment of Eccentric Error ................................................................................... 13
4.4
Adjustment of Level Errors ........................................................................................ 15
4.5
Final Steps .................................................................................................................. 15
PERFORMANCE INSPECTION ................................................................................ 17 5.1 Repeatability............................................................................................................... 17 5.2
Eccentricity Error ....................................................................................................... 17
5.3
Checking the Span (applies to the BW-K series only) ............................................... 18
6.
COMPONENT REPLACEMENT PRECAUTIONS ................................................. 19
7.
PARTS LIST ................................................................................................................. 20 ⅰ
8.
9.
TROUBLESHOOTING ................................................................................................ 23 8.1
General Troubleshooting ............................................................................................ 23
8.2
Breakdown of the Board and OK/NG Judgement ...................................................... 24 8.2.1
OK/NG judgement of the detector assembly .................................................... 24
8.2.2
OK/NG judgement of the power board assembly.............................................. 25
8.2.3
OK/NG judgement of the main board assembly ................................................ 27
WRITING THE TEMPERATURE COEFFICIENT ................................................... 28
10. WRITING SIMPLE LINEAR COEFFICIENT ........................................................... 30 11. WRITING REAL LINEAR COEFFICIENT................................................................ 31 12. HOW TO USE EDIT .................................................................................................... 34 13. ERROR DISPLAYS AND OTHER ERRORS .......................................................... 35
ⅱ
1.
OPERATION METHOD FOR ADJUSTMENT SERVICE As for the general operation method, refer to the instruction manual of the BX-K/BW-K series.
1.1
How to Enter into the Service Menu (1)
Display weight on the balance.
(2)
Keep pressing → O/T ← key and UNIT key for longer than three seconds
simultaneously. The display does not change in this occasion. (3)
Within 10 seconds after that, keep pressing POWER/BRK key and CAL/MENU
key for longer than three seconds simultaneously. (4)
Display for inputting password is shown.
(5)
Input the password using UNIT key and PRINT key. The password is “P000321”. UNIT key increases the figure by one and PRINT key moves the digit to the upper.
(6)
When the password is set, press →O/T← key.
(7)
Version No. and the model code are displayed and the balance enters into the
service menu. 1.2
Contents of the Service Menu The display varies as follows every time CAL/MENU key is pressed.
Display Example) (1) 1.00:08:XX (2) wt (3) wAd (4) tAd (5) bAt (6) SVC-CAL (7) Ldw (8) CAL wt (9) Edit (10) LinEAr (11) tEmP (12) initiAL (13) LiSt (14) End
Contents Version No. XX is the model code. Absolute load value Load AD value Temperature AD value Power supply voltage AD value Service CAL (simple linear coefficient writing) Loading/Unloading the built-in calibration mass Initialization of the built-in weight EEPROM (nonvolatile memory) editor Calculation and writing of linear coefficient Calculation and writing of temperature coefficient Initialization of EEPROM Listing up EEPROM to printer Releasing the service menu
－1－
2.
HOW TO INSPECT THE BALANCE INSIDE
(1) Disconnect the AC adapter and remove the pan. With the BW-K series, remove the pan by lifting it upwards while pushing the pan towards the back. (2) Unscrew the 4 case setscrews [1] (refer to Fig.1). Follow the procedure below for the BW-K series. (2-1) Unscrew the flange weight-stopper [2] (refer to Fig.3). (2-2) Remove the built-in calibration mass [3]. Take appropriate care to avoid injury, as the standard weight weighs approximately 5kg (refer to Fig.3). (2-3) Unscrew the calibration weight cover setscrew [4] and remove the calibration weight cover [5] (refer to Fig.2). (2-4) Unscrew the 4 case setscrews [6] and remove the spacers weight supports [7] as well (refer to Fig.4).
71
Fig.1
Fig.2
Fig.3
Fig.4 －2－
(3) Remove the case [8] so that its front faces the bottom. Hold all the cables of the connector [11] connecting the switchboard [9] to the main board [10] together and pull upwards to disconnect the connector (refer to Fig.5).
72
Fig.5 Note) Pull the connector out straight when disconnecting, as illustrated in A. Never pull the connector out at an angle, as illustrated in B. Doing so will bend the pins at the end, making it impossible to re-insert the connector (refer to Fig.6).
Fig.6
－3－
(4) Undo the 2 nuts [19]. (5) Remove the 2 screw washers [20] and detach the pan supporter base [21] (refer to Fig.7).
68
Fig.7 (6)
Unit assembly [25], main board assembly [10], and power board assembly [37] can be
checked at this state. (7)
Assemble the balance following the above steps (1) to (5) in reverse to return it to the original state.
(8)
Adjust the level of balance, connect the AC adapter and check the operation.
－4－
3.
HOW TO REPLACE THE PARTS
3.1
Replacing Main Board Assembly [10]
(1) Dismantle the balance using the same procedure as steps (1) to (5) in “2. HOW TO INSPECT THE BALANCE INSIDE”. (2) Pull the connector of cable [12] to disconnect it. (3) Unscrew the 3 screws [13] fixing the main board assembly [10] in place. (4) Holding the main board assembly [10] firmly in your left hand, pull out the connector of cable [14] with your right hand. Note) Do not pull the cable. Hold both sides of the inserted connector when disconnecting. (5) Take out the main board assembly [10] and place it somewhere free of dirt and static electricity. (6) Pull the EEPROM [18] – located at the back of the main board assembly [10] – out of its socket, taking care to avoid damaging its pins. (7) Fit the EEPROM which had been removed onto the new main board assembly [10]. (8) Assemble back together by following the steps (1) to (5) mentioned earlier in reverse.
Fig.8
－5－
3.2 Replacing Power Board Assembly [37] (1) Dismantle the balance by going through steps (1) to (5) in “2. HOW TO INSPECT THE BALANCE INSIDE”. (2) Disconnect the connector of cable [14]. Note) Do not pull the cable. Hold both sides of the connector when disconnecting. (3) Unscrew the screw [36] fixing the power board assembly [37], and each of the pair of screws [38] holding the external key connector (15 pin connector) and the RS232C (D-Sub25 pin connector) (a total of 5 screws). (4) Remove the power board assembly [37]. (5) Fit the new power board assembly [37] by following the steps (1) to (4) above in reverse.
Fig.9
－6－
3.3
Replacing Switch Board Assembly [9] Disassemble the balance following the same steps as (1) to (5) in “2. HOW TO
(1)
INSPECT THE BALANCE INSIDE.” (2)
Remove four screws [15] fixing the switch board assembly [9].
(3) Mount new switch board assembly [9] following the above steps (1) to (2) in reverse.
Fig. 10 3.4 Replacing Unit Assembly (1) Dismantle the balance following the steps (1) to (5) in “2. HOW TO INSPECT THE BALANCE INSIDE”. (2) Unscrew the 4 sensitivity adjustment cylinder setscrews [22] and remove the 2 sensitivity adjustment cylinder contacts [23] (refer to Fig.11). (3) Remove the M4 nut [24] fixing the sensitivity adjustment cylinder shaft [26]. When doing so hold the amplification lever assembly [25] firmly to prevent it from moving (refer to Fig.12). (4) Remove the sensitivity adjustment cylinder shaft [26] with the sensitivity adjustment cylinder [27] still attached (refer to Fig.12). (5) Unscrew the 4 magnetic shielding case setscrews [28] and remove the magnetic shielding case [29] (refer to Fig.11). (6) Pull the connector P1 [31] connected to the detector assembly [20] to disconnect it. When doing so take care to avoid touching the 2 thin Pt-Ni bands [32] (refer to Fig.11). (7) Unscrew the 4 unit assembly setscrews [33] using an M6 Allen wrench and remove the mechanical unit assembly [34] (refer to Fig.13). －7－
3.5 Replacing Force Cell (1) Refer to section 3.4, “Replacing the unit assembly”, to remove the mechanical unit assembly [34] from its base. (2) Remove the soldering of the 2 Pt-Ni bands [32] connecting the detector assembly [30] to the load coil (refer to Fig.11). (3) Remove the soldering of the 2 lead wires [35] for the temperature sensor. (4) Unscrew the 2 setscrews [41] and remove the detector assembly [30] (refer to Fig.12). (5) Unscrew the 2 setscrews [42] and remove the load coil assembly [39] (refer to Fig.12). (6) Unscrew the 2 setscrews [43] and remove the stopper plate [44] (refer to Fig.12). (7) Unscrew the 2 setscrews [45] and remove the amplification lever [46]. The 2 spacers [47] come off as well (refer to Fig.12). (8) Unscrew the 3 setscrews [48] and the stopper lever [49] to remove the magnet assembly [50]. The 4 spacers [51] also come off at this point (refer to Fig.14). (9) Unscrew the 4 setscrews [52] and remove the bracket [53] and the bracket spacer [54] (refer to Fig.15). (10) Detach the stopper pin [55] (refer to Fig.15). (11) Unscrew the 2 setscrews [56] and remove the force cell [57] and the spring assembly [58]. (12) Replace the force cell [57] and re-assemble by following the steps for dismantling in reverse. The method of assembly shall be explained as there are points which require attention and adjustment when assembling. (13) Fix the spring assembly [58] to the new force cell [57] using 2 screws [56]. Use a level to ensure that the top of the force cell and the top surface “A” of the spring assembly [58] are fitted in equilibrium. (14) Place the force cell [57] in between the bracket spacer [54] and loosely fix the bracket [53] using 4 screws (refer to Fig.15). (15) Fix the stopper pin [55] (refer to Fig.15). (16) Place the force cell [57] on a flat surface such as a surface table in such a way that the attached bracket [53] is at the bottom. Place a 4.5mm jig plate [61] in the gap between the underside of the force cell and the surface table. Tighten the loosely fixed screws [52] so that the force cell assembly [57] and the bracket are parallel (refer to Fig.13).
－8－
Fig.13
(17) Placing the 4 spacers in between the magnet assembly [50] and the bracket [53], fix the two together using the 3 screws [48] and the stopper lever [49] (refer to Fig.14). (18) Place spacers [47] at 2 points on the top of the force cell [57], and fix the amplification lever [46] using the 2 screws [45]. Ensure that the end of the amplification lever [46] to which the load coil [39] is attached is equidistant to the left and the right (refer to Fig.12). (19) Check that there is no dust or foreign matter on the magnet [62] (refer to Fig.12). (20) Check that there are no problems with the load coil [39] and that it is not leaking. Clean and attach it to the amplification lever [46] using 2 screws [45]. When fixing it keep the gap as equal as possible to avoid touching the yoke and the magnet (refer to Fig.12). (21) Fix the stopper plate [44] using 2 screws [43]. Ensure that the stopper plate [44] and the stopper pin [55] are not touching. To check this, place a mass of about 100g at end “A” of the amplification lever [46]. Move the amplification lever [46] up and down to check that it moves smoothly without any resistance (refer to Fig.12). (22) Loosely tighten the detector assembly [30] with the screw [41] (refer to Fig.12). (23) Connect the detector assembly [30] and the terminal of the load coil [63] by soldering it at the 2 Pt-Ni bands [32]. Take particular care to avoid damaging the Pt-Ni bands (refer to Fig.11).
－9－
Fig.11
Fig.12
－10－
Fig.14
Fig.15
Fig.16
－11－
(24) Connect the 2 lead wires [35] of the temperature sensor and the detector assembly [30] by soldering them (refer to Fig.12). (25) Loosely fix the mechanical unit assembly [34] onto the base [64] using 4 screws [33] (refer to Fig.12). (26) Loosely fix the pan supporter [21] (refer to Fig.17). (27) Adjust the case fixing pads “A” & “B” so that the parts which protrude above the pan supporter [21] are practically equal when looked at from the side of the balance. Then, tighten the screws [33] to fix the loosely fixed unit assembly properly (refer to Fig.17). (28) Remove the thus far loosely fixed pan supporter [21]. (29) Fix the sensitivity adjustment cylinder shaft [26] with the attached sensitivity adjustment cylinder [27] to the amplification lever [46] using the fixing nut [24]. Ensure that the top of the nut and the top of the screw are flush. In addition, lock the sensitivity adjustment cylinder to prevent it from moving (refer to Fig.11). (30) Connect the connector [31] to the detector assembly [30] (refer to Fig.11). (31) Place a 100g weight onto part “A” of the amplification lever [46] (refer to Fig.12). (32) Connect the AC adapter of the balance and turn on the power. (33) Move the detector assembly up/ down so that the amplification lever [46] balances in the center of the groove of the stopper lever [49]. Tighten the loosely fixed screw [41] (refer to Figs. 18 and 12). (34) Unplug the AC adapter of the balance, cover with the magnetic shielding [29], and fix with 4 screws [28] (refer to Fig.11).
Fig.17
Fig.18
73
－12－
4. 4.1
ADJUSTMENT OF THE BALANCE Height Adjustment of Detector Assembly [30] (1)
Remove case assembly [8] with the same steps as (1) to (3) in “2. HOW TO
INSPECT THE BALANCE INSIDE.” (2)
Connect (-) minus side of the voltmeter to CP1 and (+) plus side to CP2 of detector
assembly [30]. Note:
Be careful so that CP1 and CP2 do not make contact each other.
(3)
Connect the AC adapter cable of the balance into the outlet.
(4)
Adjust the height of detector assembly [30] so that (+) or (-) display of the
voltmeter is reversed when moving up/down lever of amplification lever [46] until it hits stopper lever [49] and the values at (+) side and at (-) side become almost the same. Note:
To adjust the height of detector assembly [30], loosen screw to be attached to force cell frame and move up/down the detector assembly [30].
4.2
4.3
Balance Adjustment (1)
load pan assembly .
(2)
Display wAd in the service menu.
(3)
Press →T/O← key. Numerical value appears.
(4)
Confirm that the display of wAd is within 1,000,000 to 4,000,000.
(5)
Display END and press →T/O← key to return to the normal display.
Adjustment of Eccentric Error (1)
To adjust the eccentric error, insert the jig spacer [66] into the pan support shaft [65], pan supporter [21] and fix it with screws [67]. (See Fig.19.)
－13－
69 70
Fig.19 (2)
Place the pan on top of the pan supporter.
(3)
Connect the connector [11] fitted to the case [8] to connector P6 on the main board [10]. Put down the case [8], avoiding contact with the pan.
(4)
Connect the AC adapter.
(5)
Press the POWER/BRK key to set the balance to mass display mode.
(6)
Place the corner adjustment weight on the pan. The calibration weight used varies with the model so check Table 1.
Model
Calibration weight
BX-K/BW-K-12H
5 kg
BX-K/BW-K-22H
10 kg
BX-K/BW-K-32H BX-K/BW-K-32S
15 kg
BX-K/BW-K-52S Table 1
Fig.20
(7)
The location and order of calibration weight placement is shown in Fig.20.
(8)
First, place the weight on location [1] and press the →O/T← key to zero the display.
(9)
Move the calibration weight to locations [2] to [5] and record the measurements at each location.
(10) Grind the top of the hole at the top of the force cell [57] which produced a negative －14－
value using a file (hand file, set of 10, medium sized) to reduce the wall thickness. Suck up the resultant chippings using a vacuum cleaner etc. when grinding. Any chippings settling inside the force cell will cause variations. In addition, sufficient care must be taken since the deposition of chippings on the board will result in the electronic components malfunctioning (refer to Fig.21).
Fig.21 (11) Repeat steps (8) to (10) and adjust until “0” is displayed at all calibration weight placement locations from [1] to [5]. 4.4 Adjustment of Level Errors (1)
Firstly, set to the zero point while there is no load.
(2)
Tilt the balance by laying a plate 2mm in thickness under the right hand foot of the balance and read the display.
(3)
If “+” is displayed, raise the sensitivity adjustment cylinder. If “-” is displayed, lower the sensitivity adjustment cylinder.
(4)
Repeat steps (1) to (3) and adjust until the display settles within “0±10 counts”.
(5)
Fix the sensitivity adjustment cylinder firmly once adjustment is completed.
4.5 Final Steps (1)
Unscrew the pan supporter setscrew [67] and remove the spacer [66] of the pan supporter [21] and the jig (refer to Fig.19).
(2)
Fit the 2 sensitivity adjustment cylinder contacts [23], avoiding contact with the sensitivity adjustment cylinder [27] (refer to Fig.11).
(3)
Align the 4 holes of the pan supporter [21] and the centers of the case fixing pads of －15－
the base and fix into place using the nut [19] (refer to Fig.7). (4)
Put the case [8] on and fix using 4 screws [1]. Put the pan on. In the case of the BW series, assemble by following the steps taken to remove the case [8] and the calibration weight cover [5] in reverse order, and then put on the built-in calibration weight and the pan (refer to Figs.2 to 4).
－16－
5. PERFORMANCE INSPECTION Wait more than 40 minutes after turning on the power before starting the performance inspections. Conduct the inspections at a location where there are no air movements, vibrations, or sudden temperature changes. 5.1 Repeatability (1) Load and unload a mass close to the weighing capacity (a calibration weight is desirable) on the center of the pan 10 times. Record the readings when the weight is unloaded (xi), and when the weight is loaded (yi). (2) Calculate the standard deviation (σ) for xi and yi.
(3) The balance is working normally if the σ obtained in step (2) is approximately less than 1.5 times the value entered in the “Specifications”. 5.2 Eccentricity Error (1) Obtain a mass weighing approximately 1/4 of the balance weighing capacity. (2) Load the mass in turn on the various positions located away from the center of the pan as shown in Fig.22 ([1], [2], [3], [4], [5]) and take readings of the displayed value. (3) The balance is working normally if the difference between the value obtained away from the center and the value at the center (the eccentricity error) is within ±5 counts.
Fig.22
－17－
5.3 Checking the Span (applies to the BW-K series only) (1) Perform span calibration using the built-in calibration weight. (2) Load a weight that is close to the weighing capacity and take a reading of the measurement. (3) Repeat steps (1) to (2) 3 times. (4) Obtain the average of the 3 readings. (5) The balance is working normally if the error is within ±3 counts for the S-type and ±5 counts for the H-type. (6) Perform PCAL (calibration of the built-in calibration weight) if the error is large. Refer to the section in the instruction manual dealing with the calibration of the built-in calibration weight.
－18－
6. COMPONENT REPLACEMENT PRECAUTIONS The performance of the balance may change when the following parts are replaced. Check the balance performance after replacing any of the parts below and make adjustments if required. Part being Replaced
Points Requiring Inspection Linearity
Corner error
Zero drift due to tilting
Main board
O
assembly Force Cell
O
O
O
Load coil assembly
O
O
Detector assembly
O
O
Note) When replacing the Main board assembly [8], remember to take the EEPROM from the old Main board assembly [8] and fit it onto the new one.
－19－
7. PARTS LIST See diagrams for the number reference. No.
Part name
P/N
Remarks
2
Flange weight-stopper
321-41046
For BW-K series
6
Case screw(SUS pan head)
321-41183
For BW-K series
7
Supporting weight
321-40979
For BW-K series
Weight support set (New)
321-72819-01
Case assembly, BX-K
321-62252-01
For BX-K series
Case assembly, BX-K_PH
321-62252-41
For BX-K series, PH connector
Case assembly, BW-K
321-62252-10
For BW-K series
Case assembly, BW-K_PH
321-62252-50
For BW-K series, PH connector
Switch board assembly
321-62403
Switch board assembly_PH
321-62403-40
Switch board assembly_PH(RoHS)
321-73747-40
8
9
Main board assembly
10
321-62127-01 321-70605-01
For BW-K series, Including 6 and 7
PH connector
For H type
Main board assembly_PH
321-70605-41
For H type,
Main board assembly_PH(RoHS)
321-73731-41
PH connector
Main board assembly
321-62127-02 321-70605-02
For S type
Main board assembly_PH
321-70605-42
For S type,
Main board assembly_PH(RoHS)
321-73731-42
PH connector
Unit assembly
321-62268-01
Non CE
Unit assembly(CE)
321-62268-21
CE conformity
Unit assembly_PH
321-62268-41
Non CE, PH connector
Unit assembly(CE)_PH
321-62268-61
CE, PH connector
Detector assembly
321-62130
Non CE
Detector assembly(CE)
321-62130-01
CE conformity
Detector assembly_PH
321-62130-40
Detector assembly(CE)_PH
321-62130-41
Detector assembly_PH(RoHS)
321-73737-40
Detector assembly(CE)_PH(RoHS)
321-73737-41
25
30
－20－
PH connector
32
Cut it by 23mm length to be used
Pt-Ni band 1MT
014-54301
Power board assembly
321-61415
Power board assembly(RoHS)
321-73742-41
Force coil assembly
321-34033-20
Force coil assembly(RoHS)
321-34033-41
44
Stopper plate
321-40890-04
57
Force cell
321-62257-10
66
Jig, spacer
321-49978
Level assembly
321-62996-01
Level, case and cover
Level
321-10203-01
Level only
Rubber pan supporter
321-40965-04
Pillar pan supporter, 10mm
321-41178-01
H=10mm
321-41178-02
H=11mm
321-41178-03
H=12mm
321-41178-04
H=13mm
321-41178-05
H=14mm
321-41178-11
H=15mm
321-41178-06
H=16mm
321-41178-07
H=17mm
321-41178-08
H=18mm
321-41178-09
H=19mm
321-41178-10
H=20mm
321-40919-01
For BX-K series
Pan assembly
321-41074
For BW-K series
72
Display panel sheet
321-62115
73
Level screw assembly
321-30070-03
AC adapter
074-83004-01
AC adapter for oversea
321-63980
37
39
68 69
Pillar pan supporter, 11mm Pillar pan supporter, 12mm Pillar pan supporter, 13mm Pillar pan supporter, 14mm 70
Pillar pan supporter, 15mm Pillar pan supporter, 16mm Pillar pan supporter, 17mm Pillar pan supporter, 18mm Pillar pan supporter, 19mm
71
Pillar pan supporter, 20mm Pan assembly
(Recommended AC adapter)
IN: AC100~240V OUT: DC12V/1.25A
Vinyl cover
321-40924
Vinyl cover with tape
321-73267-01
Double sided tape for fixing the vinyl 320-02138 cover
－21－
With double sided tape For Vinyl cover
Display panel assembly
321-62256-10
Display panel assembly(CE)
321-62556-11
Display panel assembly_PH
321-62256-40
Including 9 and 72,
Display panel assembly(CE)_PH
321-62256-41
PH connector
－22－
Including 9 and 72
8. 8.1
TROUBLESHOOTING General Troubleshooting Phenomena
Cause and countermeasures
Nothing is shown on the Faulty power supply. display. Faulty power board assembly
There are missing figures and/or marks with the display. The keys do not work. OL or -OL is displayed.
→ →
Faulty main board assembly Faulty main board assembly
→ →
Faulty switch board assembly
→
The transportation screws have not been unscrewed. The stopper plate is touching
→
Coil leader line (Pt-Ni band) defect
→
The load coil assembly and the magnet is touching Defective load coil assembly Damaged force cell Defective detector assembly Defective main board assembly
→
→
→ → →
Large zero drift and span The balance has not been warmed up drift sufficiently. Exposed to direct sunlight or air from heaters, air-cons etc. Poor alignment of span The balance has not been leveled The installation location has been changed Deformed or damaged force cell
→
Large eccentric error
→
Deformed or damaged force cell
Deformed pan support cap Poor repeatability of the Influence of drift air and vibration measured values Large fluctuation of the Contact of the stopper plate displayed values. The stability indicator is The force coil assembly makes contact not lit easily. with the magnet. Dust adheres to the load coil assembly or magnet assembly inside. Faulty temperature sensor. Damaged force cell Defective main board assembly Defective detector assembly. Large linearity error Deterioration of the parts
－23－
→ → → →
→ → → → → → → → → →
Replace the AC adapter. Replace the power board assembly. Replace the board assembly RL. Replace the main board assembly.
Replace the switch board assembly. Unscrew the transportation screws. Reset the position of the stopper plate. Check the Pt-Ni band and connect it correctly. Reset the position of the load coil assembly. Replace the load coil assembly. Replace the force cell. Replace the detector assembly. Replace the main board assembly . Warm the balance up. Move the balance to a different location. Level the balance. Perform span calibration at the location of installation. Readjust the span. Replace the force cell. Readjust the eccentricity error. Replace the force cell. Replace the pan support cap. Relocate the balance. Set to high stability mode. Adjust the position of stopper plate. Adjust the position of load coil assembly. Remove the adhered dust. Replace the magnet assembly Replace the force cell. Replace the main board assembly. Replace the detector assembly. Replace the defective part at the same time as readjusting the linearity.
8.2
Breakdown of the Board and OK/NG Judgement
(1)
After turning ON the power, when the balance is normal, the display stops at
“OFF”.
When the display stops at CHE0, refer to 8.2.1 or 9.2.4 (related to temperature measurement).
When the display stops at Err00, it is related to EEPROM. (Performing EEPROM initialization may restore the balance. However, since the important data such as linear coefficient are erased by EEPROM initialization, record them with Edit function beforehand.)
(2)
For the OK/NG judgement of the board, it is judged based on voltages for each part at normal state of the balance.
8.2.1
OK/NG judgement of the detector assembly 1)
Connector pin J1
Pin No.
Terminal voltage
Signal name and others (Detector Board)
1
2 to 3 V
Balance internal temperature measurement voltage
2
5V
3
±0 V
Beam signal voltage (4V/stopper)
4
-13 V
Negative power supply (from the power board)
5
0V
6
+13 V
7-8
0V
Reference voltage, from main board assembly
COM Positive power supply (from the power board) Coil
The above voltage is based on the check terminal CP-1 (COM). If Pin No. 2, 4, and 6 are judged normal and Pin No. 1 and 3 are judged abnormal, replace the detector board. If it is further abnormal, check the mechanical parts and main board assembly. 2)
Others
No conductivity must exist between the unit assembly and the detector board with the J1 connector disconnected. Remark) If conductivity exists, remove the soldering of the temperature sensor cable and check if any trouble is found with the temperature sensor or the electric circuit side of the detector board. －24－
How to check the temperature sensor independently. Remark) As for the temperature sensor, approx. 0.5 V of the voltage drop must be obtained when 1m ADC is supplied with yellow being (+) independently.
The temperature measurement voltage must be about 2 to 3 V at the temperature around 20 °C. Temperature coefficient must be about -40mV/°C.
The beam signal voltage polarity must be negative (-) when an weight is loaded.
8.2.2
OK/NG judgement of the power board assembly 1)
Connector pin J26 (Measured with J26 pulled out)
Pin No.
Terminal voltage
1
Signal name and others DCIN: J21
2
0V
COM, GND
10
3V
232C/DTR
11
3V
232C/TXD
12
0V
Communication system RXD signal
16
0V
Communication system DSR signal
17
5V
DTR/P
18
0V
NC: TXD/P(/P: Printer port)
33
4.5 V
35
5V
Logic power supply
36
5V
Logic power supply
37
0V
COM, GND
38
0V
COM, GND
39
+ 13 V
Analog positive power supply
40
- 13 V
Analog negative power supply
MN
0V
In case J21 monitor voltage is 12 V
Other pins are all 0 V or NC
The above voltage is based on COM, GND.
－25－
2)
Connector pin J23 (Measured with J26 pulled out.)
Pin No.
Terminal voltage
Signal name and others
2
-9V
232C/TXD
3
0V
232C/RXD
6
5V
232C/DSR
7
0V
GND
11
0V
GND
14
0V
GND
20
-9 V
232C/DTR
The above voltage is based on GND.
3) Connector pin J25 (Measured with J26 pulled out.) Pin No. 1
Terminal voltage 0V
2
Signal name and others DTR/P (5V: when J26 is connected)
GND
3
Min. 10V
4
5V
5
DCIN: J21 RXD/P NC
6
5V
TXD/P
7
5V
DSR
8
5V
CTS
The above voltages are based on GND.
－26－
8.2.3
OK/NG judgement of the main board assembly (with the balance
operating correctly) Evaluation shall be made on condition that the above mentioned each board from 8.2.1 to 8.2.2 are all normal. 1)
Checking the analog servo (peripheral circuit of IC M41)
Voltage at each J1 pin must be the same as that of the checking item of the detector assembly J11. Confirm there is not such abnormality as hunching (a phenomenon in which a beam vibrates). Remark) When the display fluctuates, check the mechanical side if wAd and tAd are normal. Check at the mechanical side includes insulation between the coil and the mechanical unit, contact of the coil and the magnet case (due to impurity such as dust). Check the cell load spring and fulcrum as well.
2)
Checking the AD converter Remove J1-7 pins that link to the coil from the board.
The minimum display digit should be stabilized. When + OL or - OL is displayed, the wAd in the service menu must be around 4,065,000 and is stabilized.
tAd in the service menu must be around 33570 (20°C to 25°C).
bAt in the service menu must be around 255 (when AC adapter output 11V.)
3)
Checking the peripheral devices
Connect the optional printer. When PRINT key of the balance main unit is pressed, the display value should be printed correctly.
Other necessary peripheral options should operate correctly. Because some options operate via power board assembly, if not operating correctly, replace with a spare power board assembly and check the operation.
The clock function should be set according to the instruction manual.
－27－
9.
WRITING THE TEMPERATURE COEFFICIENT Prepare the column oven (which can maintain approx. 5C to 35C for four to five hours) and a 20 kg weight. Enter the service menu and prepare wAd and tAd at operational state. 1)
Set the column oven temperature at 10C and leave the balance for about four hours
(which is the time required to stabilize tAd) with the power supplied. Load/unload the weight (repeat zero/20 kg) and obtain the following data. (The initial 20 kg value after temperature change should be abandoned.)
tAD value at 10C is called “10T.” (Example: 00031672)
Obtain the mean value of wAd with zero load at 10C. This value is called “10Z.” (Example: 01335655)
Obtain the mean value of wAd with 20kg load at 10C. This value is called “10F.” (Example: 05921453)
2)
Next, change the set value of the column oven to 20C.
After confirming
temperature increase, leave the balance for about four hours. Load/unload the 20kg-load weight in the same way as in 1), and obtain “20T,” “20Z,” and “20F.” (The initial 20kg value after temperature change should be abandoned.) 3)
In the same way, change the set temperature of the column oven to 30C. After
confirming temperature increase, leave the balance for about four hours and obtain “30T,” “30Z,” and “30F.” (The initial 20kg value after temperature change should be abandoned.) 4)
Write the data obtained in the above items 1) to 3) at the addresses from No. 40 to
No. 51 using Edit in the service menu. (For how to operate Edit, refer to Chapter 11.)
At the address No. 40, write the upper four digits of “10T.” (Example: 40: 00.03)
At the address No. 41, write the lower four digits of “10T.” (Example: 40: 16.72)
At the address No. 42, write the upper four digits of “10Z.” (Example: 40: 01.33)
At the address No. 43, write the lower four digits of “10Z.” (Example: 40: 56.55)
At the address No. 44, write the upper four digits of “10F.” (Example: 40: 05.92)
－28－
At the address No. 45, write the lower four digits of “10F.” (Example: 40: 14.53) In the same way, at the addresses No. 46 and No. 47, write the data of “20T.” At the addresses No. 48 and No. 49, write the data of “20Z.” At the addresses No. 4A and No. 4B, write the data of “20F.” At the addresses No. 4C and No. 4D, write the data of “30T.” At the addresses No. 4E and No. 4F, write the data of “30Z.” At the addresses No. 50 and No. 51, write the data of “30F.” To save the written data on the EEPROM, keep the →T/O← key held down until you confirm that SET is displayed.
5)
Next, to calculate the temperature coefficient and write it in the EEPROM
(non-volatile memory), select tEmP in the service menu and press the →T/O← key. Temperature correction coefficient is calculated based on the contents of addresses No. 40 to No. 51 by the built-in program and the information on temperature correction is automatically saved at the specified address in the EEPROM.
－29－
10. WRITING SIMPLE LINEAR COEFFICIENT Making the balance operational when mechanical assembly is changed. 1)
Display “SvC_CAL” in the service menu.
2)
Press the →T/O← key. The balance enters the stage in which linear constant can be set temporarily. (Ld30000 blinks.)
3)
Load a weight of 3kg on the balance. When the stability mark () lights up, press the →T/O← key. (Ld 0 blinks.)
4)
Unload the balance from the pan. When the stability mark () appears, press the →T/O← key to end the simple linear coefficient setting.
－30－
11. WRITING REAL LINEAR COEFFICIENT Enter the service menu mode and prepare wAd and tAd at operational state. After supplying power to the balance in the stabilized ambient temperature, repeat loading/unloading the weight (see table below). A count data value is obtained by figuring the absolute value of the weight to be used up to the necessary digit. Values of the weights to be prepared and the count data values are as follows. With BW12KH, BW22KH, BW32KH, BX12KH, BX22KH, BX32KH balances Values of the
Count data
weight to be used
values
Weight 1
10 kg
00100000
Weight 2
15 kg
00150000
Weight 3
20 kg
00200000
Weight 4
25 kg
00250000
Weight 5
30 kg
00300000
Weight 6
32 kg
00320000
With BW32KS, BW52KS, BX32KS, BX52KS balances
1)
Values of the
Count data
weight to be used
values
Weight 1
10 kg
00010000
Weight 2
20 kg
00020000
Weight 3
32 kg
00032000
Weight 4
40 kg
00040000
Weight 5
50 kg
00050000
Weight 6
52 kg
00052000
Record the data of temperature data tAd. Example: 00031627 (Ad value shall be recorded in 8-digit display. If the value is less than 8 digits, fill
in 0 at the upper empty positions.) 2)
Sequentially record wAd of the weights from 1 to 6 corresponding to each maximum
capacity. (If the value is less than 8 digits, fill in 0 at the upper empty positions.)
－31－
Example: With BX32KH Load/unload the weights 1 to 6 sequentially and record wAd value. wAd
"L0" =
01000010
(00000000)
10 kg (Weight 1)
"L1" =
02000020
(00100000)
15 kg (Weight 2)
"L2" =
03000030
(00150000)
20 kg (Weight 3)
"L3" =
04000040
(00200000)
25 kg (Weight 4)
"L4" =
05000050
(00250000)
30 kg (Weight 5)
"L5" =
06000060
(00300000)
32 kg (Weight 6)
"L6" =
07000070
(00320000)
0 g (No load)
3)
Count data value
L*
(Including a corrected value)
Write the data (wAd and the count data values) obtained in the above 2) in the
addresses No. 40 to No. 5B using Edit in the service menu. Each one data requires four addresses. The initial two addresses are for the upper and lower values of count data. The latter two addresses are for the upper and lower values of wAd of the actually measured “L*.” (For how to operate Edit, refer to Chapter 12.)
Write 00000000 at the addresses No. 40 and No. 41 for the count data of L0.
Write 01000010 at the addresses No. 42 and No. 43 for L0. (wAd) (At the address No. 40, write the upper four digits of the count data. Example: “40:00.00”) (At the address No. 41, write the lower four digits of the count data. Example: “41:00.00”) (At the address No. 42, write the upper four digits of L0. Example: “42:01.00”) (At the address No. 43, write the lower four digits of L0. Example: “43:00.10”)
Write 00100000 at the addresses No. 44 and No. 45 for the count data of L1.
Write 02000020 at the addresses No. 46 and No. 47 for L1 (wAd). (At the address No. 44, write the upper four digits of the count data. Example: “44:00.10”) (At the address No. 45, write the lower four digits of the count data. Example: “45:00.00”) (At the address No. 46, write the upper four digits of L0. Example: “46:02.00”) (At the address No. 47, write the lower four digits of L0. Example: “47:00.20”)
In the same way, write L2 to L5 data at the addresses No. 48 to No. 57. －32－
Write 00320000 at the addresses No. 58 and No. 59 for the count data of L6.
Write 07000070 at the addresses No. 5A to No. 5B for L6 (wAd). (At the address No. 44, write the upper four digits of the count data. Example: “44:00.32”) (At the address No. 45, write the lower four digits of the count data. Example: “45:00.00”) (At the address No. 46, write the upper four digits of L0. Example: “46:07.00”) (At the address No. 47, write the lower four digits of L0. Example: “47:00.70”) Finally, write the temperature data (tAd) in 1).
Write the count data for LT (tAd), 00031627 at the addresses No. 5C and No. 5D. (At the address No. 5C, write the upper four digits of tAd. Example: “5C:00.03”) (At the address No. 5D, write the lower four digits of tAd. Example: “5D:16.27”) To save the above written data on the EEPROM, keep the →T/O← key held down
until you confirm that SET is displayed. 4)
Next, to calculate and write linear coefficient in the EEPROM (non-volatile memory), select LinEAr in the Service menu and press the → T/O ← key. The linear correction coefficient is calculated based on the contents of addresses No. 40 and No. 5D by the built-in program and the linear information is automatically saved at the specified address in the EEPROM. (At the address No. 44, write the upper four digits of the “10F”. Example: “40:05.92”) (At the address No. 45, write the lower four digits of the “10F”. Example: “40:14.53”) In the same way, write the “20T” data at the addresses No. 46 and No. 47.
－33－
12. HOW TO USE EDIT Repeat pressing ON/OFF the CAL/MENU key and display Edit in the service menu mode. Select Edit mode (the contents of non-volatile memory is displayed) using the →T/O← key. At the same time, the address at the 10’s position blinks. 1)
Repeat pressing ON/OFF the UNIT key and select 4. (Blinks): The addresses at No. 40s are selected.
2)
Press the PRINT key and move to the 1’s position: 0 of 40 blinks.
3)
Press the UNIT key and select 1. (Blinks): The address No. 41 is selected.
4)
Press the →T/O← key and confirm the data at the address No. 41: The contents of the address No. 41 are displayed. (The contents of the EEPROM are
not changed.) 5)
Using the PRINT and the UNIT keys, change the data currently blinking to the
desired numerical value and save the data by pressing the →T/O← key after it is changed. At the same time, the address moves up one to 42, and 4 of No. 42 blinks. Pressing the →T/O← key in this occasion enters the address No. 42 data edit mode. To change the address, repeat the above steps 1), 2), and 3). Address is confirmed in 4) and the data is changed in 5). The same is repeated after this. 6)
To update the data in the EEPROM (non-volatile memory), keep the →T/O← key
held down more than 3 seconds until “--- “ appears. After that, “SET” appears and the data is updated. To exit the program without updating the data, press the POWER/BRK key, then “Abort” is displayed and the data of the EEPROM will not be updated.
－34－
13. Error
ERROR DISPLAYS AND OTHER ERRORS Nature of Error
Notes
Indicator CAL E0 CAL E1 CAL E2
CAL E3 CAL E4
CAL E5
ERR 00
ERR 05
ERR 06 ERR 07 ERR 10 ERR 20 ERR 21 ERR 22 ERR 23 ERR 24
COMERR Absolute value OL Display value OL Absolute value OL Display value OL
Calibration weight loading motor fault
Does not apply to the BW-K as the calibration weight is loaded manually Unstable data during sensitivity calibration When unstable for more than 25 seconds Appears when there is a large deviation from the When it deviates from the zero point during zero point during sensitivity calibration linear adjustment by more than 5% of the weighing capacity Appears when the calibration weight is out of When the calibration weight is out of position during calibration position by more than 1% Appears when the span of the calibration weight is When the calibration weight is off by more off when calibrating the sensitivity of the built-in than 1% calibration weight The wrong calibration weight has been loaded If the deviation from the calibration weight value displayed on the balance is greater than 10% Appears when an un-initialized EEPROM is fitted Check the temperature coefficient exponent where “FF” should never be written, and if “FF” is there the error will appear Appears when there is an EEPROM checksum Let the balance restore itself automatically error even when ERR 05 occurs since it is difficult to shorten the write-in time Appears when there is a ROM checksum error None Appears when there is a RAM check error None Appears when there is an error in entering the password Appears when an incorrect numerical value has been set Appears when the necessary data has not been entered in each respective measurement mode Appears when an attempt is made to operate the menu while the menu is locked Appears when the balance is used wrongly Appears when the pilot power voltage becomes Range of the Lowbatt display: the LOW low. The EEPROM cannot be written into battery display appears when the CPU port input is less than 2V; when the “bat” in the Service menu is 184 counts; when the power voltage is less than 8V Communication error Appears when an item weighing more than the The absolute value weight is more than 1.05 weighing capacity is loaded x the weighing capacity Appears when an item weighing more than the When the displayed value exceeds the weighing capacity is loaded weighing capacity Appears when the pan etc. has been taken off The absolute value weight is less than 0.1 x the weighing capacity Appears when the pan etc. has been taken off When the negative reading exceeds the negative weighing capacity
－35－
