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Service Manual

1. atas optat fed oit tfe ttt 21 TAC r Eccentric eror Checks cs emo tert gti o tert egt onn monet ente 22 7 4 Linearity inspection 22 8 PARTS T 25 9 TROUBLESHOOTING 1 senes 29 ListOf MOUBISS eire tetto rete tct edet erat 29 9 2 Countermeasures for each 29 9p SCALE LC OON DUE REUS 29 ACANA osten mei md oA pie ipie este loe out 30 923 EMO EE Pt T cS 30 vc REM c A 31 9 2 5 Span calibration CAL time is 31 9 2 6 Display is abnormal o ete o te teo ate tatis 32 9 2 7 A CAL appears tnt tol t tos UM 32 9 2 8 The display deviates after stability mark appears 32 9 2 9 Some sound is heard from the balance 32 9 2 10 Nothing appears on the 33 9 2 11 switches on the front panel do not work 33 ABS SH e 0110 9 2 12 The display becomes unstable when something is loaded on the 33 9 2 13 Dispersion fluctuation zero drift and poor return of zero point 34 9 9 JODeckpOIUls daa tuti Eta e adel rS OR IR Au Id Edu e d luta 34 9 3 1 Dete
2. See 6 3 Checkpoint 2 Check the soldering of Pt Ni band 15 and check that coil assy 25 is not disconnected See Fig 9 on page 47 4 Remove the magnet cover See Fig 2 1 page 42 Remove four screws pan head screw M2 5 x 6 and dismount the magnet cover Note Keep the magnet assy away from dust Checkpoint 3 Check that coil assy 25 makes no contact with the magnet assy and no dust exist between them See Fig 2 2 on page 42 e When they are in contact loosen the tightening screws of the lever and coil assy 25 to adjust the position of coil assy 25 f any dust exits clean coil assy 25 and the magnet assy as follows How to clean coil assy 25 and the magnet assy Remove the unit assy from the base Refer to Fig 8 on page 46 Remove the magnet cover then the magnet assy from the unit assy Refer to Fig 2 3 on page 42 Clean coil assy 25 and the magnet assy taking the dust away from them by using scotch tape Note Keep the unit away from dust ABS SH e 0110 6 7 8 9 10 Note Do not hold the error adjustment lever Refer to Fig 8 on page 46 Inspection of fulcrum spring 13 load spring 14 and parallel guide 37 Inspect fulcrum spring 13 load spring 14 and parallel guide 37 according to 3 INSPECTION AND REPLACEMENT OF FULCRUM SPRING LOAD SPRING AND PARALELL GUIDE lt Reassembly gt Assemble the magnet cover 4 pcs using f
3. 12 ABS SH e 0110 48 Screw of jig Long 23 Screw of jig Short 23 Fig 14 Spacer 321 53904 Cup washer 26 Torque free washer S 6a a Fulcrum spring 3 Q9 Flat washer M4 41 Load spring Bolt with a hexagonal hole M4x12 Fig 13 ABS SH e 0110 Bolt with a hole SPG washer Small flat washer Pan supporter stand assy Fig 15 ABS SH e 0110 Back plate Adhesive tape Both sid Flat spring Both sides esive tape ide Pull fixer ABS SH e 0110 2 XW 5 2 E 8 MZ 6 35 7 E V
4. 25 and the force cell If the tester needle in the maximum width moves even a little you can judge that leak is occurring Disconnection of coil assy 25 is rarely found except at the soldered portion Check all the soldered portions related to coil assy 25 ABS SH e 01 10 9 3 3 Display when the power is turned ON When the power is turned ON the display proceeds in the order of CAL 2 CAL 1 CAL 0 CAL End You can seek the cause of a trouble by checking the time each display is appearing When CAL d appears When CAL appears any or all the CAL 2 1 0 becomes long In this occasion see 9 3 6 Dispersion fluctuation zero drift and poor return of zero point 9 3 4 Temperature sensor signal check Select tAd in the service menu and let the balance display the temperature sensor signal tAD value If the temperature sensor signal tAD is normal it is displayed as follows e The value is around 15 000 to 16 000 at the room temperature of 20 C e Approx 260 counts increase per 1 C raise of room temperature e The fluctuation width is within 2 counts When A CAL appears frequently ACAL appears when the value of the temperature sensor signal varies 130 counts from the value of previous span calibration This is equivalent to approx 0 5 C change in the room temperature Judgement as to whether this is due to the installation environment or failure of the unit sh
5. each spring will not move See Fig 14 1 P di Charmfering section Spacer Pa a Fulcrum spring Spring set 24 Load spring Fig 14 1 c Tighten the lower bolt with 20 kgecm ensuring that each spring will not move d Tighten the upper screw with the torque free washer touching the end surface of the lever to prevent the spring from rotating together Torque 20 kgecm See Fig 14 2 Torque free washer Lever Fig 14 2 e Check if each spring is not bent or cracked Note When replacing fulcrum spring 13 and load spring 14 replace three of them together at one time Note Use the regular bolts washers and cup washers 26 only Note Do not use a used cup washer 26 again 10 Remove the magnet cover and after adjusting the position of coil assy 25 using a screw mount the magnet cover See Fig 2 2 on page 42 11 Fixthe pan supporter assy with screw See Fig 15 on page 50 12 ABS SH e 01 10 12 13 15 16 Note Tighten the screw with the torque of 25 kgecm using a hex torque wrench Note Mount the pan supporter so that it is visually parallel to the lever Remove assembly jig for the AX series 22 from the unit assy See Fig 14 on page 49 Note Remove jig screws A3 A2 and A1 in this order Incorporate the shake protector so that it does not make contact with the lever pin Checkpoint Make adjustment according to 6 3 Adjustment of the
6. in this Name in this manual Order name Order No Remarks manual CUSHION 321 50746 01 36 Screw for parallel SCREW PAN WITH 321 40051 guide WASHER ___37 __ Parallel guide _ PARALLRLGUIDEB 321 51983 08 2 28 PTFEtape _______ 320 00070 39 PTFEspay PTFESPRAY 32161141 40 IC NM93C50N 075 197 43 2 41 FLATWASHER ___ WASHER BS FLAT 7 023 62040 26 ABS SH e 01 10 Pan Pan supporter 3 Pan cushion 35 Draft shield ring c Draft tape 32 7 Roof glass assy Front glass assy Right glass assy G WI Floor plate 4 Draft tape GD Switch panel 9 Power board assy Switch cable Unit assy Digital board assy Fig B 28 ABS SH e 0110 9 TROUBLESHOOTING 91 List of troubles 13 CAL E2 Error message CAL d Error message ERRO1 Error message ERROS Error message Span calibration CAL time is long Display is abnormal CAL frequently appears The display deviates after the stability mark appears Some sound is heard from the balance Nothing appears on the display The switch es on the front panel does do not work The display becomes unstable when something is loaded on weighing pan 17 Dispersion fluctuation zero drift and poor return of Zero point 9 2 Countermeasures for each trouble 9 2 1 CAL
7. shake protector Mount the screw bar to which balance weight 33 and eccentric weight 28 are attached to the lever See Fig 12 on page 48 Checkpoint Make adjustment according to 6 4 Adjustment of mechanical balance and level Mount the relay board and solder Pt Ni band 15 See Fig 9 on page 47 Solder two temperature sensor lines to A and B of detector assy 21 Note Connect the yellow line to A and blue line to B ABS SH e 0110 4 PART REPLACEMENT 4 1 Replacement of the power board assy Same as 1 in Section 2 HOW TO CHECK THE UNIT ASSY Same as 2 in Section 2 HOW TO CHECK THE UNIT ASSY See Fig 5 on page 44 for the following Pull out the flat cable 26P from power board assy 18 Remove two screws hex screws at the RS232C connector portion using a box driver Remove three screws Semus M3 x 8 and Semus M4 x 8 and dismount power board assy 18 from the base Set new power board assy 18 and fix it to the base with three screws Tighten two screws hex screws at the RS232C connector portion Connect the flat cable 26P to power board assy 18 Note The red line must be located in the left as viewed from the rear of the balance 4 2 Replacement of the digital board assy 6 Same as 1 in Section 2 HOW TO CHECK THE UNIT ASSY Same as 2 in Section 2 HOW TO CHECK THE UNIT ASSY See Fig 5 on page 44 for the following Pull out all the cables from
8. 00 g 04 0 0003 9 Initially obtain the reference value of 20g point ABS SH e 0110 The reference value against the actual mass amount of 120 0004g 19 9994g 100 0010g becomes 120 00025g calculated with the following equation KB A 2 H G 1 2 2 120 0002g 0 0000g 0 00019 2 120 0000g 0 0002g 0 00039 2 2 120 00025g Accordingly the reference value against the true mass amount of 120g is 119 99985g calculated with the following equation 120 00025g 120 0000g 120 0004g 119 99985g If the balance has no linearity error the reference value against the true mass amount 20g is 19 999975g calculated with the following equation 119 99985g 20 0000g 120 0000g 19 999975g A Next obtain the measurement value at 20g point The measurement value against the actual mass amount of 19 9994g is 19 99935g calculated with the following equation D C G 2 19 9992g 0 0001g 0 00029 2 19 99935g The measurement value against the true mass amount of 20 0000g is 19 99995g calculated with the following equation 19 99935g 20 0000g 19 9994g 19 99995g B Lastly the linearity error at 20g point is 0 000025 g calculated with the following equation B A 19 99995g 19 999975g 0 000025g Similarly the linearity errors against other mass amounts are as follows Linearity error at 50 g point is 0 00001 g Linearity error at 100 g point is 0 00023 g 4 Evaluation The balance
9. CEMENT certet 14 41 Replacement of the power board 5 14 42 Replacement of the digital board 14 4 3 Replacement of the analog board 5 14 44 Replacement of the detector 1 211 15 45 Replacement of the switch 4 0002 15 2 ABS SH e 0110 5 ASSEMBLING THE CASE ASSY 16 6 BALANCE ADJUSTMENT 17 6 1 Adjustment procedure of the 17 6 2 Height adjustment of the detector 55 17 6 3 Adjustment of the shake protector 2 4 1 1 1 18 6 4 Mechanical balance and level adjustment 18 6 5 Rough adjustment of the eccentric 19 6 6 Fine adjustment of eccentric 1 1 41 1 1 19 6 7 Linearity scion pie pique piu uen eee ee epu ken ee 20 7 PERFORMANCE CHECK OF THE BALANCE 21 7 1 Environment and conditions for checking the balance 21 7 2 epestabili CHECK x tmd
10. E2 Meaning This is an error message indicating that zero point deviates at the time of span calibration CAL CAL E2 appears when span calibration is performed with something loaded on weighing 1 or the balance condition has gone wrong due to some reason s The judgement standard of the zero point differs between the first calibration after the power is turned ON and the second or later calibration In the first calibration after the power is turned ON CAL E2 appears when the zero point deviates 10 g from the normal state zero point at the time of adjustment In the second or later calibration after the power is turned ON CAL E2 appears when the zero point deviates 1 g from that of the first calibration after the power is turned ON Cause CAL E2 is caused by the incorrect use of the balance or by the ABS SH e 0110 hardware failure of the balance As the incorrect use of the balance the following cases may be considered e Level adjustment has been performed during span calibration when the power is turned ON e Something was loaded on weighing pan 1 during span calibration If CAL E2 appears every time the power is turned ON the following may be considered as causes Disconnection or leak of coil assy 25 e The shake protector makes contact with the lever pin Fulcrum spring 13 or load spring 14 are damaged e Normal operation cannot be performed due to the fai
11. If small dust faulty soldering or faulty contact is the cause it may be corrected temporarily when the case of mechanical unit is opened but the same phenomenon may appear later If this kind of trouble occurs roughly assume the cause of trouble before opening the balance case Actually check the balance as follows 1 Weights to be prepared With the maximum capacity of 2209 200 g 200 g weight With the maximum capacity of 120 g 100 g weight 2 Setthe measurement conditions of the balance as follows Measurement mode St Stability detection width b1 Zero trucking off 3 Perform measurement at around the zero point and at around the maximum capacity 7 to 10 times alternatively However do not read the numerical value right after the stability ABS SH e 0110 4 ABS SH e 0110 mark gt appears but read the value 20 sec after loading the weight on and unloading the weight from weighing pan 1 respectively Verify which of the following three patterns applies to the data in 3 and specify the cause e There is no dispersion around the zero point and around the maximum capacity The following may be considered as causes The stability mark appears too quickly due to the influence of environment There is a problem with the sample or the sample container Failure of the balance which is not appearing currently Caused by vibration but vibration is not occurring currently e T
12. KERN amp Sohn GmbH fa er Bo mera D 72322 Balingen Frommern Tel 0049 0 7433 9933 0 AS 4 Postbox 4052 Fax 0049 0 7433 9933 149 E Mail info kern sohn de Internet www kern sohn de Service Manual Electronic Analytical Balances Page 2 KERN ABS version 1 0 ABS SH e 0110 KERN ABS Service Manual Electronic Analytical Balances Contents 1 SERVICE MENU e ret enden 5 1 4 How to enter the service menu mode 2 5 1 2 Contents of the service menu mode 4 2 5 1 2 1 Model coated t teak a S eR daa a ee 6 1 2 2 Linear adjusimentzcueseneronesenesonesosssososesosesesss 6 1 2 3 Inputting the weight values for linear adjustment 6 1 2 4 Software version No 6 1 2 5 Print out the non volatile RAM 7 1 2 6 Editing the non volatile RAM data 7 2 HOW TO INSPECT THE UNIT ASSY 1 8 3 INSPECTION REPLACEMENT OF THE FULCRUM SPRING LOAD SPRING AND PARALLEL GUIDE 10 3 1 How to dismount the unit assy 10 3 2 Inspection and replacement of the fulcrum spring load spring and parallel 10 4 PART REPLA
13. analog board cover are dismounted and the key switch assy is connected to digital board 19 Adjust the balance with the following procedure 12 13 14 15 Turn ON the power and enter the service menu see 1 1 Height adjustment of detector assy 217 See 6 2 Mount the shake protector See 6 3 Adjustment of the mechanical balance and the level See 6 4 Rough adjustment of eccentric error See 6 5 Mount the inner case See Section 2 3 Mount the analog board cover See Section 2 3 Perform span calibration E CAL using the external weight Push weighing pan 1 with your hand to check the repeatability and stability at zero point Mount the case assy on the base See Section 2 2 To perform the following adjustment correctly warm up the balance for 30 min Fine adjustment of eccentric error See 6 6 Repeatability check See 7 2 Linearity adjustment See 6 7 Linearity check Return to 14 if the performance specifications are not satisfied See 7 4 6 2 Height adjustment of the detector ASSY 1 2 Pull out the 2 pin coil current cable from analog board assy 20 See Fig 4 on page 43 Adjust the variable resistance of detector assy 21 and position of detector assy 21 so that the lever displacement output voltage CP2 of detector assy 21 becomes 2V max and 2V min Note The lever displacement signal varies to plus direction when the
14. appears It is not abnormal when A CAL appears once in 20 to 30 min at the air conditioned place 0 5 C of temperature change corresponds to 1 PPM change of weight If you have trouble of A CAL appearing frequently use the balance with A CAL set to OFF Cause See 9 3 4 Checking the temperature sensor signal and judge whether it is caused by failure of the balance The display deviates after stability mark appears Cause When the display deviates after stability mark appears but the stopped value does not have dispersion poor installation environment of the balance may be the cause In this case the deviation amount of the display value differs as follows depending on the stability detection width With b1 Around 1 count With b3 Around 3 counts Countermeasures The following countermeasures are effective Change the installation site of the balance to the location free from draft Prevent the wind from entering directly into the weighing room when the door is opened Open Close the door a little Open close the door on the opposite side of the unit Some sound is heard from the balance Cause The ABS series balance performs measurement with its lever slightly ABS SH e 0110 vibrating Accordingly if you listen carefully you may hear the sound of the vibrating lever when the balance is placed at a quiet place or when something is loaded on weighing pan 17 However if extremely loud noise is h
15. cord the values displayed when the stability mark appears Note When loading the weight on the weighing pan 1 place it at the center of the pan 1 Note With the large drift both at the 0 point and at the span point even a normal balance may have the standard deviation of 0 15 mg or more 3 Evaluation The balance is normal if the standard deviation of the displayed value is 0 10 mg or less when loading unloading the weight o lt 0 10 mg ABS SH e 0110 22 7 3 1 2 3 Eccentric error check Weight to be prepared or the equivalent With the maximum capacity of 120g 50 g weight With the maximum capacity of 220 g 200 g 100 g weight Operation Place the weight at the center of weighing pan 1 and let the balance display 000 0000 g by pressing the key with the stability mark lit Next move the weight back forth and right left on weighing pan 1 and record the value displayed at each position Evaluation The balance is normal when the difference in values is 0 5 mg or less between when the weight is in the center position and when it is in the eccentric position 7 4 Linearity inspection 1 2 Weight to be prepared or equivalent With the maximum capacity of 120 g weights of 20 g 50g and 100 g With the maximum capacity of 220g 200g weights of 50g 100g and 200g Each weight value can be checked by the precision of 0 1 mg Operation Example Following is the description of the exam
16. ction coefficient at the zero point and span point or the correction coefficient of linearity have been rewritten for some reason Cause The data stored in the non volatile memory has been destroyed 9 2 5 Span calibration CAL time is long The time required for span calibration is approx 40 to 50 sec when power is turned ON Even if span calibration takes a long time the balance can be used if CALEnd appears The span calibration consists of the following three steps e CAL 2 being displayed Measurement at zero point e CAL 1 being displayed Measurement at span point e CAL 0 being displayed Measurement at zero point At each step of the calibration if the fluctuation range of the measurement data is within three counts the calibration proceeds to the next step in 15 sec and if it is approx 45 counts or more CAL d appears after the end of span calibration Cause The causes for long calibration time is according to the description in 9 2 2 CAL d See 9 3 3 Display when the power is turned ON 9 2 6 Display is abnormal Cause ABS SH e 0110 9 2 7 9 2 8 9 2 9 32 The cause for the appearance of something like signs that are not displayed at the normal state is the faulty digital board assy 19 CAL appears frequently Meaning of A CAL When the temperature inside the balance changes 0 5 C or more from that of the previous span calibration automatic span calibration starts and A CAL
17. ctor assy positlOri coe pner CARR CD SOUND SUE EU 34 9 3 2 Leak and disconnection of the coil 34 9 3 3 Display when the power is turned ON 35 9 3 4 Temperature sensor signal check 1 35 9 3 5 Dispersion of span calibration 36 9 3 6 Dispersion fluctuation zero drift and poor return of zero point 36 10 PRINCIPLE OF MEASUREMENT 39 10 1 Magnet coil current ala deter rel 39 10 2 Temperature correction of the current value of electromagnetic coil 39 10 2 1 Temperature correction by the electric Circuit 39 10 2 2 Temperature correction by software 39 10 3 Linearity COME CHON bee 40 104 Span once a dat rd ed D ud pied n 40 4 ABS SH e 01 10 1 SERVICE MENU 1 4 How to enter the service menu mode First let the balance display the weight value 1 Hold down both the __ key and PRINT key simultaneously for three seconds or longer 2 Release both the key and PRINT key at the same time 3 Hold down both the CAL MENU key key simultaneously until the model name is displayed on the LCD The balance has now entered the
18. digital board assy 19 Remove four screws Semus M4 x 8 and dismount digital board assy 19 from the base Mount new digital board assy 19 to the base with four screws Semus M4 x 8 Connect all the cables to digital board assy 19 4 3 Replacement of the analog board assy Same as 1 in Section 2 HOW TO CHECK THE UNIT ASSY Same as 2 in Section 2 HOW TO CHECK THE UNIT ASSY See Fig 4 on page 43 for the following Remove two screws Semus M3 x 6 and dismount the analog board cover Pull out all the cables from analog board assy 20 Remove two screws Semus M3 x 10 and dismount analog board assy 20 from the inner case ABS SH e 01 10 6 7 Note Do not lose the spacer nut type 1 M4 Place the spacer nut type 1 4 between new analog board assy 20 and the inner case and fix it with two screws Semus M3 x 10 Connect all the cables and mount the analog board cover 4 4 Replacement of the detector assy 10 11 Same as 1 in Section 2 HOW TO CHECK THE UNIT ASSY Same as 2 in Section 2 HOW TO CHECK THE UNIT ASSY See Fig 4 on page 43 for the following Remove two screws Semus M3 x 6 and dismount the analog board COVer Pull out the detector output cable from analog board assy 20 Remove two screws Semus M4 x 8 and dismount the inner case from the base Remove two screws Semus M3 x 8 and dismount detector assy 21 Mount new detector assy 21 C
19. display appears and the non volatile RAM data can be edited Example of display 00 0123 L Data is indicated by two bytes Address Meaning of the above display 01 H is written at Address 00 23H is written at Address 01 How to edit Pressing the CAL MENU key increments the address by e Pressing the UNIT key increases the numerical value of the blinking digit by one Pressing the PRINT key moves the digit Pressing the TARE key validates the data of the displayed address ABS SH e 0110 2 HOW TO INSPECT THE UNIT ASSY lt Disassembly and Inspection gt 1 Pull out the power cable and remove weighing pan 1 draft shield ring 2 and pan supporter assy 3 See Fig 1 on page 41 2 Remove the case assy See Fig 1 on page 41 2 1 Remove three screws Semus M4 x 10 and dismount the case assy from the base 2 2 Pull out the operation cable from digital board assy 19 Be careful not to damage the cable in this occasion 3 Remove the analog board cover and the inner case See Fig 4 on page 43 3 1 Remove two screws Semus M3 x 6 and dismount the analog board cover 3 2 Pull out the detector output cable and the coil current cable from analog board assy 20 3 3 Remove two screws Semus M4 x 8 and remove the inner case Checkpoint 1 Check that the shake protector and the lever pin do not make contact and no dust exists between them
20. eard or only one unit among many makes unusually loud noise check if the coil assy 25 or other movable parts are not loose 9 2 10 Nothing appears on the display Cause The following may be considered as causes e Power is not supplied to the balance Failure of power board assy 18 Failure of digital board assy 19 Faulty contact of the cables between the above board assys 9 2 11 The switches on the front panel do not work Cause If all the switches do not work the following may be considered as causes e The operation cable connected to digital board assy 19 is disconnected or its faulty contact e Faulty digital board If only one or two key keys does do not work faulty switch unit s may be considered as the cause If only the key does not work failure of the printer power board assy 18 and or digital board assy 19 may be considered as the cause 9 2 12 The display becomes unstable when something is loaded on the pan If the display becomes unstable only when something is loaded on weighing pan 1 the following may be considered as causes e Static electricity is being applied to the sample or the sample container e Magnetic force is being applied to the sample or the sample container e here is a difference between the temperature of sample or and container and that of the weighing chamber ABS SH e 0110 34 Even if one of the above is considered as the cause confirm that the balance is normal as f
21. ee Fig 18 on page 20 5 Regard the value displayed when the weight is moved to Y position on weighing pan 1 as Y g See Fig 18 on page 20 6 Make adjustment until the absolute values of X g and Y g becomes 10 mg or less respectively When X g is a plus value loosen the eccentric error adjustment screw P When X g is a minus value tighten the eccentric error adjustment screw P When Y g is a plus value loosen the eccentric error adjustment screw Q When Y g is a minus value tighten the eccentric error adjustment screw Q 6 6 Fine adjustment of eccentric error 1 The case assy must be mounted on the base 2 Same as 2 in 6 5 Rough adjustment of the eccentric error 3 Load the weight at the center of weighing pan 1 and press the key to display 0 0000 g 4 Regard the value displayed when the weight is moved to X position on ABS SH e 0110 5 6 weighing 1 as X g See Fig 18 Regard the value displayed when the weight is moved to Y position on weighing pan 1 as Y g See Fig 18 Eccentric error adjustment screw P Back Pan 1 Weighing chamber Fig 18 Make adjustment until the absolute values of X g and Y g are 0 5 mg or less respectively When X g is a plus value loosen the eccentric error adjustment screw P When X g is a minus value tighten the eccentric error adjustment screw P When Y g is a plus value loosen the eccentric error adjustment
22. for the following 2 Move balance weight 33 so that the wAD value at zero point becomes between 800 000 and 1 000 000 and keep this wAD value in your memory 3 Place a plate with the thickness of 2 0 mm under left front level assy 12 viewed from the front of the balance and check how the wAD value varies 4 Perform the following adjustment until the difference between the wAD value in 2 and wAD value in 3 becomes 250 or less 18 ABS SH e 01 10 If wAd value 2 lt wAD value 3 rotate eccentric weight 28 toward lower direction If wAd value in 2 gt wAD value 3 rotate eccentric weight 28 toward upper direction Note 250 counts of the wAD value is equivalent to approx 10 mg 5 Rotate balance weight 33 to fix balance weight 33 and eccentric weight 28 to the screw bar 6 5 Rough adjustment of the eccentric error The aim of rough adjustment of the eccentric error is to confirm that the eccentric error can be adjusted while observing the displayed value on the LCD Follow the procedure below 1 Mount the inner case to the base 2 Prepare the following weights For the balance with the maximum capacity of 120 g 50 g weight For the balance with the maximum capacity of 220 g 200g 100 g weight 3 Load the weight at the center on weighing pan 1 and press the key to display 0 0000 g 4 Regard the value displayed when the weight is moved to X position on weighing pan 1 as X g S
23. h a hex wrench See Fig 13 on page 49 Checkpoint Check if there is any strain crack and or warp with fulcrum spring 13 and load spring 14 Remove four screws for parallel guide 36 respectively and dismount upper and lower parallel guides 37 See Fig 15 on page 50 Note Do not lose the eccentric error adjustment spacer 34 placed under parallel guide 377 Note Do not forget the original location of the eccentric error adjustment spacer 34 as it must be mounted on that location when reassembled Checkpoint Check if there is any strain crack and or warp with upper lower parallel guides 37 lt Reassembly gt 8 9 Assemble upper lower parallel guides 377 See Fig 15 on page 50 Note Align the mount hole of parallel guide 37 and that of the force cell frame at the center Note Place the eccentric error adjustment spacer between the upper portion of the column and parallel guide 37 where it was placed before and then fix it with a screw 18 kgfecm Note Do not use a used screw to fix parallel guide 367 Assemble fulcrum spring 13 and load spring 14 with the following procedure See Fig 14 on page 49 Place each spring so that the mount holes of fulcrum spring 13 load spring 14 are aligned with the center of those of the unit assy ABS SH e 0110 b Insert spring set 24 into the upper hole and lightly tighten the lower bolt ensuring that
24. here is dispersion similarly around the zero point and around the maximum capacity The following may be considered as causes Failure of the balance Caused by vibration Dust around weighing pan 1 and pan support assy 3 e Dispersion around zero point is smaller than that around the maximum capacity The following may be considered as the causes Failure of the electrical system of balance Caused by vibration Eccentric error of the balance 10 PRINCIPLE OF MEASUREMENT 10 1 10 2 Magnet coil current value With the ABS series magnetic force balancing method is adapted as the principle of measurement With the magnetic force balancing method the sample weight operates on one end of the lever which rotates and displaces around the fulcrum point and the magnetic force is generated at the other end according to the sample weight to keep the lever at level As the size of this magnetic force is proportional to the amount of current that flows to the electromagnetic coil the amount of the sample can be calculated from this current amount With the ABS series the amount of current that flows to the electromagnetic coil is digitally calculated PID calculation is digitally performed on the A D value of lever displacement and its result electromagnetic coil current value is returned to the analog amount electromagnetic coil current amount and is fed back to the mechanical system of the balance Adapt
25. ing this method has realized high resolution electronic balance using the A D converter with relatively low resolution Temperature correction of the current value of electromagnetic coil The current value of electromagnetic coil unless the temperature is corrected has the temperature coefficient of approx 400 ppm C due to the magnet inside the electromagnetic force generator Then the temperature coefficient of the electromagnetic coil current value is corrected within 2 ppm C with the following two step correction means 10 2 1 Temperature correction by the electric circuit Reference voltage which has the temperature coefficient reverse to that of the magnet is supplied to the electromagnetic coil current generator which corrects the temperature coefficient of the electromagnetic coil current value within 30 ppm C 10 2 2 Temperature correction by software 38 By the temperature data obtained from the temperature sensor the temperature coefficient of electromagnetic coil current value is corrected within 2 ppm C ABS SH e 0110 10 3 Linearity correction Linearity is corrected by software First all the area is corrected using a secondary equation secondary correction and the remaining error is corrected using a primary equation primary correction by 50 g increment 10 4 Span calibration The weight value to be displayed includes the error within 2 ppm C caused by the temperature coefficient To perform co
26. is normal if the absolute value of linearity error is 0 2mg or less ABS SH e 01 10 8 PART LIST No in this manual Name this manual Order name and Order No are listed in the following table To order the parts inform us of both the Order name and the Order No The No in this manual is the No in the parenthesis with attached to the right shoulder Example of a No in this manual weighing 1 No in this Name in this manual Order name Order No Remarks manual PAN PRESS 321 60453 Draft shield ring WIND SHIELD RING 321 41205 supporter Pan supporter PAN SUPPORTER ASSY 321 60459 Bottom plate COVER PLATE 321 60437 ABS220 ABS120 Leveling foot FOOT WHEEL ASSY 321 53530 30 Load spring SPRING FORCE POINT 321 53700 05 Pt Ni band Pt Ni BAND 014 54301 Right glass assy SIDE GLASS RIGHT ASSY 321 60445 MOTER ASSY 321 60520 E Domestic Overseas Analog board assy BOARD ASSY ANALOG 321 60234 01 SPRING FORCE POINT 321 54744 02 Detector assy DETECTOR ASSY 321 60521 01 Assembling jig for ASSEMBLING JIG 321 60209 AX series Long Short Spring set pin Rubber washer WASHER RUBBER 321 60587 2 Eccentric weight CENTER OF CRAVITY 321 60756 01 1 7 10 10 11 12 13 14 15 16 17 17 18 19 20 21 22 23 23 24 25 26 27 8 29 PULL STOPPER Eccentric error SPACER 4 CORNER 321 60522 01 adjustment spacer ABS SH e 0110 30 31 32 33 4 3 No
27. lever is moved up and varies to minus direction when it is moved down Note Adjust the maximum voltage and the minimum voltage of the lever displacement signal within 0 2 V specified voltage ABS SH e 0110 3 Fix detector assy 21 to the force cell frame with two screws Semus x 10 measure the lever displacement output voltage again and confirm that the Max value and the Min value are within the above specified voltage range 4 Connect 2 pin coil current cable to analog board assy 20 flip the lever by hand and confirm that the lever displacement output returns to OV 6 3 Adjustment of the shake protector 1 Loosely fix the shake protector to the force cell frame with screws See Fig 10 on page 47 2 Tighten two screws of the shake protector alternatively while moving up and down the screw bar to which balance weight 33 and eccentric Lever Pin Shake protector O weight are attached 28 Fig 11 Note The screw bar becomes hard to move up down if the lever pin is in contact with the shake protector See Fig 11 Note careful not to damage fulcrum spring 13 and load spring 14 3 Confirm that the shake protector does not make contact with the lever pin using a magnifying glass Note Confirm that no dust attaches to this portion 6 4 Mechanical balance and level adjustment 1 Adjust the level of the base while observing the level indicator See Fig 12 on page 48
28. lure of the electric board assy When CAL E2 appears occasionally the following may be considered as Causes e The balance is used incorrectly e Failure of the hardware 9 22 CAL qd Meaning This is an error message indicating that the measured value has dispersion or fluctuation at the time of span calibration CAL CAL d appears when the balance is shook large vibration exists or the balance has dispersion in the measured values during span calibration Even though CAL d is displayed the balance can be used by pressing the ON OFF key Causes The following may be considered as causes e The level adjustment of the balance is performed during span calibration e The balance door was open during span calibration e The balance base was shaken during span calibration e There was large vibration during span calibration e The balance has dispersion 9 2 3 Err 01 Meaning 30 ABS SH e 0110 This is an error message indicating that the temperature signal tAD value of the service menu is inappropriate Causes The following may be considered as causes e Faulty connection between the temperature sensor and the detector assy 21 Faulty analog board assy 207 or faulty digital board assy 19 See 9 3 4 Temperature signal check 9 2 4 Err 05 Meaning This is an error message indicating that the data stored in the non volatile memory has been deleted ERR 05 appears when the corre
29. mode Model name Displays the model name and the domestic export setting condition AbS 22 AbS 220 for domestic specification setting E AbS22 AbS 220 for export specification setting Linear adjustment Linear adjustment can be executed by selecting Lin Adj See 6 7 Linear adjustment Inputting the weight values for linear adjustment The weight values for linear adjustment can be input by selecting Lin SEt See 6 7 Linear adjustment Input the true weight values of the following weights for the balance with the maximum capacity of 320g 50g 100g 150g 200g 230g 300g 350g for Others 50g 100g 150g 200g 230g How to input Pressing the UNIT key increases the numeral value at the blinking digit by one Pressing the PRINT key moves the digit by one To validate the input value press the key SEt will be displayed for several sec to inform you that the input has been validated Software version No Displays the software versions of the control CPU and the operational CPU 1 00 1 02 The number in the left indicates the software version No of the control CPU and the one in the right indicates that of the operational CPU ABS SH e 0110 1 2 5 Print out the non volatile RAM data By selecting EE oUt non volatile RAM data is output to the balance EP 50 or EP 60A connected 1 2 6 Editing the non volatile RAM data By selecting Edit the following
30. ollows Turn ON the zero tracking function and press the key with another sample or and container loaded If the weight display is stable the balance is normal Hints of measurement If static electricity is being applied to the sample and or the container covering them with the metal such as aluminum foil may produce good result If magnetic force is being applied to the sample and or the container demagnetize them before measurement Make the difference as little as possible between the temperature of sample and or container and that of the weighing chamber 9 2 13 Dispersion fluctuation zero drift and poor return of zero point If dust adheres to the movable part of the mechanism such as the balance lever phenomenon such as dispersion fluctuation zero drift and poor return of zero point may occur If something is wrong with the installation environment or sample s the similar phenomena will occur See 9 3 6 Dispersion fluctuation zero drift and poor return of zero point to find the cause 9 3 Checkpoints 9 3 1 9 3 2 Detector assy position For the position of detector assy 21 see 6 2 Height adjustment of detector assy 21 in this service manual Leak and disconnection of the coil assy To check the leak of coil assy 25 remove the power cable and the J4 connector cable from the analog board assy 20 and check the leak between each line at the small board that relays Pt Ni band 15 and coil assy
31. onnect the detector output cable Turn ON the power and adjust the height and the volume control of detector assy 21 See 6 2 Height Adjustment of the Detector Assy Mount the inner case Mount the analog board cover 4 5 Replacement of the switch panel 1 2 3 See Fig 6 on page 45 for the following Remove switch panel 9 Wipe off dirt on the dented portion Paste new switch panel 9 ABS SH e 0110 5 16 ASSEMBLING THE CASE ASSY Remove four screws M4 x 6 and dismount the back plate See Fig 16 on 51 N Remove pull 29 and pull fixer 30 from side glass assy 5 6 and pull them out from the case assy Note As it is bonded with double faced tape carefully remove them using a precision driver Note Attention should be paid not to lose the flat spring as it is placed between side glass assy 5 and 6 and the case roof assy 3 Remove two nuts and disassemble the case the draft shield column and the case roof assy See Fig 17 on page 52 Note Front glass assy can be dismounted by loosening the nuts Note If side glass assy 5 and 6 do not move smoothly when assembled apply Teflon on the end surface of the glass by a piece of cloth on which PTFE spray 39 is blown ABS SH e 0110 6 BALANCE ADJUSTMENT 6 1 Adjustment procedure of the balance The balance shall be adjusted on condition that the case assy inner case and
32. ould be made from the change of ambient temperature and the change of this numerical value When Err01 appears The temperature sensor signal tAD value must be 30 000 or more 5 000 or less When the value is 30 000 or more the following may be considered as causes e Temperature sensor or its cable is short circuited or leaks to the metal portion of the mechanical unit e The temperature sensor or detector assy 21 is damaged ABS SH e 0110 36 9 3 5 9 3 6 When the value is 5 000 or less e The temperature sensor or its cable is disconnected e Failure of the temperature sensor detector assy 21 or analog board assy 20 Dispersion of span calibration When the span values have dispersion every time the span calibration is performed check the dispersion after span calibration When CAL d appears press the key and let the balance display the weight value If the balance has dispersion when the weight is loaded on and unloaded from the weighing pan 1 see 9 3 6 Dispersion fluctuation zero drift and poor return of zero point If the balance does not have dispersion when the weight is loaded on and unloaded from the weighing pan 1 see 9 3 3 Display when the power is turned ON Dispersion fluctuation zero drift and poor return of zero point Many possibilities such as failure of the balance poor environment problems with sample or the sample containers may be considered as causes
33. our screws pan head screw M2 5 x 6 See Fig 2 1 on page 42 Mount the inner case and the analog board cover See Fig 4 on page 43 Note Do not pinch a cable between the base and the inner case Mount the case assy See Fig 1 on page 41 Mount draft shield ring 2 pan supporter assy 3 and weighing pan 1 See Fig 1 on page 41 Adjust the level of the balance turn ON the power and check the balance operation ABS SH e 0110 3 3 1 3 2 INSPECTION REPLACEMENT OF THE FULCRUM SPRING LOAD SPRING AND PARALLEL GUIDE 1 2 3 4 1 3 How to dismount the unit assy Same as 1 in Section 2 HOW TO INSPECT THE UNIT ASSY Same as 2 in Section 2 HOW TO INSPECT THE UNIT ASSY Same as 3 in Section 2 HOW TO INSPECT THE UNIT ASSY Remove the unit assy from the base Remove four screws Semus 4 x 25 and dismount the unit assy from the base See Fig 8 on page 46 Note Keep the unit assy away from dust Note Do not hold the eccentric error adjustment lever of the force cell frame See Fig 8 on page 46 Checkpoint Check that there is no strain no crack and or no warp with upper and lower parallel guides 37 See Fig 15 on page 50 Inspection and replacement of the fulcrum spring load spring and parallel guide lt Disassembly and Inspection Preparation Disassemble and assemble the unit assy at a location free from dust Attention m
34. ple operation procedure for the balance whose capacity is 120g Press the key with the stability mark lit with 0 g load on weighing 17 Load 120 g on weighing 1 and record the value displayed when the stability mark is lit Make the load 0 g on weighing pan 1 and record the value displayed when the stability mark is lit Load 20 g on weighing pan 1 and record the value displayed when the stability mark is lit Load 50 g on weighing pan 1 and record the value displayed when the stability mark is lit Load 100 g on weighing pan 1 and record the value displayed when the stability mark is lit Make the load 0 g on weighing pan 1 and record the value displayed ABS SH e 0110 when the stability mark is lit H Load 120 g on weighing pan 1 and record the value displayed when the stability mark is lit Make the load 0 g on weighing 1 and record the value displayed when the stability mark is lit 3 How to calculate How to calculate the linearity error based on the above example operation is described as follows The actual mass amount of the weight used shall be as follows Nominal value of weight Actual mass of weight 20g 19 9994 g 504 49 9985 g 100 g 100 0010 g The values recorded through the above operation are as follows Weight Measurement value A 09 0 0000 g B 120g 120 0002 g C 0g 0 0001 g D 20g 19 9992 g E 50g 49 9983 g F 100 g 100 0005 g G 0g 0 0002 g H 120 g 120 00
35. rrect weight measurement perform span calibration as necessary taking temperature change into consideration ABS SH e 0110 40 Case assy Pan supporter Pan cushion Pan head screw M3x4 Floor plate 4 Switch cable 9P 6P Digital board assy Semus M4x10 Fig 1 ABS SH e 01 10 Magnet cover 4 Clearance Screw Magnet assy m head screw 4 10 Fig 2 3 ABS SH e 0110 42 Semus M4x8 Inner case Spacer nut type 1 M4 Analog board assy Motor assy Detector output cable Coil current cable Fig 4 ABS SH e 0110 Base Digital board assy Power board assy Semus M4x8 x Qu G ev o Es Cable cover es Semus M4x8 ping rubber Red line P p S p Clam Semus M4x8 Semus M3x8 Semus M4x6 Motor clamp Fig 5 ABS SH e 0110 Semus M4x8 Fig 6 ABS SH e 0110 Pug Semus M4x25 Unit assy Eccentric error adjustment lever Base assy for AW AX series Fig 8 ABS SH e 0110 Spacer Detector output cable Check terminal es ger Re 9 Pan head screw M4x6 Semus M3x10 Flat washer M4 Shake protector Lever pin 46 ABS SH e 01 10 Lever Flat washer SPG washer Screw bar Spacer nut type 1 M4 LQ Eccentric weight A SPG washer M4 Balance weight 33 Fig
36. screw Q When Y g is a minus value tighten the eccentric error adjustment screw Q 6 7 Linearity adjustment 1 2 Select Lin SEt in the service menu and input the weight value for linear adjustment See 1 2 3 Select Lin Adj in the service menu and execute linear adjustment See 1 2 2 ABS SH e 0110 7 PERFORMANCE CHECK OF THE BALANCE 7 1 Environment and conditions for checking the balance e Room temperature Room temperature from 20 C to 30 C and temperature variation of 1 C H is desirable e Humidity The humidity must not be extremely high or low Humidity from 40 to 70 is desirable e Installation site The balance should be placed at the location free from blowing wind and vibration e Warm up operation Warm up is required for more than 30 min Setting of the balance Must be set to St bl Cautions at inspection e Place the weight in the weighing room beforehand so that the balance can be inspected without temperature difference between the weight and the weighing room Use a pair of long tweezers to load unload the weight and avoid entering your hand into the weighing room 7 2 Repeatability check 1 Weight to be prepared or the equivalent For the balance with the maximum capacity of 120 g 100 g weight For the balance with the maximum capacity of 220 0 2000 200 g weight 2 Operation Load unload the above described weight on from the weighing 1 seven times respectively and re
37. service menu 1 2 Contents of the service menu mode Contents of the service menu are as follows Display on the LCD E AbS22 Lin Adj Lin SEt 1 00 1 02 End EE oUt CAL SEt wAd tAd oAd LAd ABS SH e 0110 Menu contents Model name Linear adjustment Inputting the weight values for linear adjustment Software version No End of service menu Returns to the weight display mode Printing out the non volatile RAM data A printer dedicated for the balance is required Inputting the external weight value used for span calibration A D value of the load Approx 800 000 to 1 000 000 counts without any load on the weighing pan 1 About 2 5 counts 0 1 mg A D value of the temperature 15 000 to 17 000 counts at the temperature around 15 C A D value of the load after temperature correction unit g The balance is normal when the zero point is approx 1g When it is 10g or more the balance might be out of order A D value after temperature correction and linear correction unit g 1 2 1 1 2 2 1 2 3 1 2 4 wG Weight value bAt Power supply voltage unit V S id Set Inputting serial no last five digits only Edit Editing non volatile RAM data trAdE on Export specification setting If set to export specification E is attached to the left of the model name trAdE oF Domestic specification setting End End of service menu Returns to the weight display
38. ust be paid to prevent dust from entering the clearance between parallel guide 37 and the force cell frame and the clearance between the shake protector and the pins for lever Remove the blue and the yellow lines connected to the temperature sensor from detector assy 21 using a soldering iron See Fig 10 on page 47 Remove Pt Ni band 15 using a soldering iron Remove a screw Semus M4 x 12 to dismount the relay board from the force cell frame See Fig 9 on page 47 Loosen the nut with a wrench and remove the screw bar to which balance weight 33 and eccentric weight 28 are attached from the lever Note Be sure to perform the work with a shake protector attached See Fig 10 on page 47 Otherwise the spring might be damaged Remove two screws M4 x 6 and dismount the shake protector from the force cell frame Refer to Fig 10 on page 47 Note careful not to bend fulcrum spring 13 and load spring 14 ABS SH e 0110 Replacing coil assy 25 5 By removing the magnet cover and the connection screw between the lever coil assy 25 the coil assy can be replaced See Fig 2 3 on page 42 Remove one screw bolt with a hole SPG washer small flat washer and dismount the pan supporter assy See Fig 15 on page 50 Checkpoint Check if there is any strain crack and or warp with fulcrum spring 13 and load spring 14 Remove fulcrum spring 13 and load spring 14 wit

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