Service Manual KERN EW/EG
Contents
1. Return the Calibration Knob to NEIGH point After displaying E nd the mode returns to weight value automatically ee gt continued from page 21 Cautions 1 r EF Cal must be carried out in following cases 1 When built in weight is added or replaced 2 When linearity adjustments is done 3 When DJD board is replaced 2 The quality tolerance of the reference weight determine dj ears em Ad Pana me an gt CAL oFF EW EG SU e 9811 the accuracy of the scale Use vveights of higher accuracy than the scale 3 Adjust the level beforehand The ref calibration must be done in a good environment no vvind no oscillation and no temperature changes 4 I Err The reference weight is less than Vof F S 2 Err The data error exceeds 0 4 Adjust the linearity 5 SECTION 5 PARTS REPLACEMENT 51 Sequence of mechanism unit replacement EW EG KB e 9811 19 D Weighing Mechanism unit is defective Replace the mechanism unit Re setting address data Data of the new mechanism Calibration Performance Test 1 How to remove weighing mechanism 1 Remove the upper case referring to page 9 2 Remove three mechanism fixing nuts by a nut driver of opp 7mm 3 Remove wires to the tuning fork sensor by welding solders at DJD circuit board Mechanism Fixing Nuts Tuning Fork Wires TI T2 T3 DJD PCB 4 Remove the mechanism unit by holding at the lovver case2. Servicemanual for electronic precision balances series KERN EVVVEG Version 1 1 07198 EVVJEG SU e 9811 CONTENTS 1 2 3 4 5 6 SECTION 1 TOTAL VIEW OF EW WG ennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnnnnennnnnnnenn 3 SECTION 2 ELECTRONIC CONSTRUCTION none ee rene e tere nete tere mete teren ete teren ete teren ete tere m eee RR ER 4 2 1 Block diagramm KERN EW type nana ese ee nenen ere EER tere EER tere EER tere EER tere GE RR teren ete tere mete nenet ete t n 4 2 2 Block diagramm KERN EG type rmmevnnnvvnnnnnnvnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnennnnnnneen 5 2 3 Whole wiring KERN EW type ees ee see seke rene nene nente teren ete te res tete rene te tere m ete tere e tete rete te tere m ete teme 6 2 4 Whole wiring KERN EG type ie esse ee AA 7 SECTION 3 TROUBLESHOUTING PROCEDURE ee ees ee ee ese ee see ER Re ee Ge ER RR RR Ge ER RR RR Ge ER RR RR GEE RR RR Rae ER RR RR 8 3 1 Troubleshooting procedure see ee rene eee RR EER tere EER RR RR EER tere EER tere GE ERK KAR GEE RR KERE ER RR RR GEE ERK ER 8 3 2 Troubleshooting table esse EER RR RR EER RR rene te tere EER RR RR EER tere EER teres ete teren ete tere EER tere mete tere GE tet n 9 3 3 Primary CHECKS RR EE EE N RE OE EN NE N ett 10 3 4 How to remove the case see res RR EER RR RR EER tere EER tere EER tere EER tere BEER tere BERE tere GEE ERK RR Ge EE RR RR ae EE RR 1
3. 4 Setting of address data has mistake 5 Coefficient memories address data have changed by noises or static electricity Adjust linearity Display does not 1 Some parts such as stopper touches others get settled down 2 Weighing pan touches other parts 3 Foreign substance is in the scale Display does not 4 Tuning fork sensor or mechanism unit is defective repeat correctly 5 Affected by a wind or disturbing oscillation Check environment or working base Zero point drifts Check also setting of stabilization time See page 9 of operation manual o Err appears 1 Big weight applied to the scale pan net weight with a net load tare value exceeds the scale capacity less than specified 2 Coefficient memories address data have changed capacity FS 9d by noises or static electricity Adjust linearity 3 Setting of address data has mistake 4 Calibration weight is not correct Span is out of 1 Tuning fork sensor or mechanism unit is defective specified range 2 EW EG board is defective 3 Setting of address data has mistake 4 Coefficient memories address data have changed by noises or static electricity Linearity isoutof 1 Tuning fork sensor or mechanism unit is defective specified range 2 Setting of address data has mistake 3 Coefficient memories address data have changed by noises or static electricity Adjust linearity 4 Calibration weight is not correct Corner error istoo 1 Mechanism unit is def
4. EG 600 2M EW 6000 1M 8000g 500g 8500g Caution Erroneous setting of stoppers may cause destroying the tuning fork sensor which is very delicate Guide link should be stopped with the Maximum Weight 2 without fail 16 EW EG SU e 9811 44 Calibration of Built In Weight Ref Cal EG type Following does not describe the procedure of ordinary span calibration This is the procedure of Calibration of the built in weight with EG scales Itis necessary to adjust the linearity of the scale beforehand Refer to page 19 EW EG KB e 9811 17 18 Pressing T key and F key together hit ONJOFF key Release T and F key when display shows JJri si Press T key Hit S key to read EF CAL first then press F key together and release both on 0 display starts blinking to indicate zero adjustment is performed automatically Display advances to gn FS Apply reference weight of scale capacity just in the centre of the pan Display starts to blinking to indicate the span is adjusted automatically Display DO changes to on Unload the weight CAL Q starts blinking to indicate zero adjustment is performed automatically Display changes to CAL on Turn the Calibration Knob to CAL to load the built in weight CAL on starts blinking to indicate the weight data is being memorized Display changes to C AL oFF to indicate the calibration is completed
5. EW EG SU e 9811 Mechanism Fixing Nuts 2 How to install weighing mechanism 1 Place the mechanism on the lower case Fix it with three fixing nuts 2 Solder wires of the tuning fork sensor to the DJD circuit board Mechanism Fixing Nuts do HY rn TE 6 Mle dd PN Tuning Fork Wires D ZA A N S black earth wire white 3 Cover the scale referring to page 10 EW EG KB e 9811 21 1 Remove DJD board 1 Remove the upper case referring to page 9 2 Unplug connectors at CN6 and CN4 on DJD board With battery option unplug CN3 with output option unplug CN1 and CN2 in addition 3 Unsolder T1 T2 and T3 4 Remove DJD board by removing two DJD fixing screw N N DID fixing screw CN1 CN2 Output option TI T2 T3 Ste N3 Batte f option CN6 DJ power cord 2 Installation of new PCB 1 Install a new DJD board with two fixing screws 2 Plug connectors CNI AG Output cord CN3 Gt Battery cord CN6 Gt DJ power cord DC 9V in T1 T2 T3 SH Tuning fork cord 3 Cover the scale refering to page 10 22 EW EG SU e 9811 6 Parts list for EW type Parts list for EW type 24 PartNo PartName Materia 5 62 PE 8 Sidecover CABS 96 jeweooo 1im Aluminum EW EG SU e 9811 Parts list for EG type 26 PartNo PartName Materia 6 1409 protector Stainless steel eee 8 Topcovr ABS 00000000 EW EG SU e 9811
6. 1 3 5 ON OFF of lock switch susse seek ee Rd GEN GR dete RE GEGEE NR ek Gee EN ve Ee Se GR dann RE aE aata dt GEE ina kaa Ke 12 3 6 How to cover the caS uu esse EER RR an EER RR RR EER tere EER ANAN ANAKAN BEER tere BEER tere mete tete BEER tere Ge EE RR RR ae EER 12 SECTION 4 ADJUSTMENTS AND SETTINGS da nana see ee nonen rene nete rene ne tere mete tere EER tere EER R RR Re me ere ae RR 13 4 1 Span calibration Cal EW type sere ss ee ee EER RR RR EER RR re EER tere EER te RR EER tere GEE RR KAR mete te RR GEE ERK RR ae mete 13 4 2 Corner error adjustment see es RR EER RR RR EER tere EER tere EER tere mete te rem ete te rep ete te rem ete te RR Ge EE RR RR ae EER 14 4 3 How to adjust overload StODDEF ees EER na RR EER tere EER tere EER te rem ete tere GEE RR KAR EER tere mete tere ae EE RR 15 4 4 Calibration of Built In Weight Ref Cal EG type see ee esse ee EER RR RR EER tere EER tere meme R RR Rae RR 17 SECTION 5 PARTS REPLACEMENT ee ee esse ee ese ee ee Ge EE te rene te tere pete tere EER tere mete te teme te tere Ge E ERK RR ae EER 19 5 1 Sequence of mechanism unit replacement EER RR RR EER RR RR EER RR RR EER RR RR EER tere EER RR RR Ge RR 19 Parts list for EW ve NGARAN ER N EE EE EE N EE EE EE EE EN 23 EW EG SU e 9811 1 SECTION 1 TOTAL VIEW OF EW WG Total view of round pan type 150g gt 600g Total view of square pan type 15009 gt 6kg EW EG KB e 9811 2 SECTION 2 EL
7. ECTRONIC CONSTRUCTION 2 1 Block diagramm KERN EW type XC68HCT11S6PU or MC6BIICTL1S6 PU or MC68HC11S6PU Oscillatio Circuit heh Mechanism Unit ER U e Various options AC adaptor 4 EW EG SU e 9811 2 2 Block diagramm KERN EG type XC68HC711S6PU or MC6BIICTLLS6PU or MC68HC1ISGPU 5 50 GG TT Board CPU LLCD Battery 7 Option 6 Weighing ER pana Various options EE pm pen Calibration AC adaptor EW EG KB e 981 1 2 3 Whole wiring KERN EW type displa Battery option Various options DJLF board Gp 6 EW EG SU e 9811 2 4 Whole wiring KERN EG type DJD board display 6V 1200mA Battery option Various options DCgV IN EW EG KB e 9811 3 SECTION 3 TROUBLESHOUTING PROCEDURE 3 1 Troubleshooting procedure AC adaptor Mm gattery is Tx is connectet charged Pia Display is settled down Connectors re connecte Fuse on DJD is OK Replace YES fuse NG Tag fork is Tic ice DJD PCB is Replace DJD 8 EW EG SU e 9811 3 2 Troubleshooting table No display lights on 11 EW EG board is defective 2 AC adapter is defective 3 Wrong connection of connection cords inside 4 Built in battery option is discharged u Err or o Err 1 Wrong weighing pan is applied appears after self 2 Tuning fork sensor or mechanism unit is defective test of segments 3 EW EG board is defective 888
8. e weighing mode 6 Set the Lock Switch ON if necessary referring 7 to page page 9 and page 10 1 Itis recommended to use a calibration weight of better accuracy than the scale 2 The calibration is available with Vof F S Nevertheless it is recommended to use weight closer to F S for accurate calibration 8 Error messages 0 Err The calibration weight is over the full capacity 1 Err The calibration weight is less than Yof the capacity 2 Err The data error exceeds 0 4 Or perhaps the scale may be defective EW EG KB e 9811 sos If AdJ does not appear turn the lock switch 35000 13 4 2 Corner error adjustment Remove the upper case referring to page 9 Place the pan base then place the vveighing pan on the mechanism Adjust the level Remove two fixing screws on EW EG board and place the screws on the plastic part of the lovver case Adjust corner errors by adjusting bolts reffering to follovving illustrations CAUTION Don t touch PCB vith tools lt may damage the PCB by shorting gt OSS NA ES JD Ko SP gt AN ja PRN Corner adjusting bolt B For The error is positive to the centre The error is negative to the centre Drive the bolt clockwise Drive the bolt counter clockwise 14 EW EG SU e 9811 4 3 Hovv to adjust overload stopper 1 Apply the pan base on the mechanism Then slide out stoppers by loosening two fixin
9. ective such as Roberval much plate spring has been bent or twisted 2 Pan base touches other parts Display suddently 1 Built in battery option has been consumed disappeared in 2 EW EG board is defective operation 3 AC adaptor is defective b Err appears 1 EW EG board is defective 2 Coefficient memories address data have changed by noises or static electricity Adjust linearity d Err appears 1 Adress data related to determine the capacity has been destroyed Contact the shipper 2 EW EG board is defective 2 Err 1 The data error exceeds 0 4 Or perhaps the scale may be defective Contact the shipper EW EG KB e 9811 3 3 Primary checks 1 Is any wind around the site Is any oscillation Is the working table stable 2 Is anything under the pan base or the weighing pan 3 Is the weighing pan a right one 4 Is AC adapter connected both with the scale and with the outlet properly 5 Is battery option charged sufficiently 10 EW EG SU e 9811 3 4 How to remove the case 1 Unplug the AC adapter Remove the pan and pan base 2 Remove 2 case fixing screws with a philip driver 3 Locate two hooks beneath the scale near to front Pull those two hooks toward you to lift the case up then shift the case to rear to release it from rear hooks Case Fixing Screw Upper Case Mechanism Unit EW EG KB e 9811 11 4 Remove the upper case and place it to the left Remove protecto
10. g screws with a hexagon wrench of 3 x 3 Overload Stoppers Stopper Fixing Screws 2 Press the ON OFF key to on while pressing F key and T key together Release both keys when DJr appears Co Apply reference vveights up to the Stopper Setting Value specified in the table in page 1571 Press the T key to clear the display to zero 0 4 Insert stoppers until they slightly touch corresponding guide link Holding the stopper with a screw driver or the like fix the stopper by driving the cap screw securely Guide Link touching 5 The adjustment is good if display shows E between 5g and 50g Stoppers Even the display shows 0 if the guide link touches stopped by stoppers by increasing reference weights up to Maximum specified in the table 15 2 the adjustments is good HOW TO KNOW WHEN LINK TOUCHES STOPPER While increasing weights when the guide link touches the stopper the display will not show as much value as increased weight This indicates the guide link has touched the stopper 6 How to correct the setting If the display value in above 5 Is less than 50g such as 100g for example slide out stoppers a little from the guide link If the display value in above 5 Is over 5g such as 59 for example insert the stoppers slightly more into the guide link EW EG KB e 981 1 15 Table for stopper positioning for setting 1 increased to be applied 2 EG 300 3M EW 600 2M 1000g 100g 1100g
11. r beforehand if any 3 5 ON OFF of lock switch DJD board Upper Case Lock Switch Set the lock switch to ON before stamping or sealing so that the user is unable to change parameters or to calibrate the scale 3 6 Howto cover the case 1 Cover the scale with the upper case seeing cables are just stored inside properly Insert the rear hooks first then press the upper case gently until two front hooks are set securely 2 Drive in two case fixing screws securely Set pan base and then weighing pan on the scale Verify the setting of the Lock Switch When the setting of the Lock Switch is OFF display shows 8 8 8 followed by ADJ by energizing Do 12 EW EG SU e 9811 4 SECTION 4 ADJUSTMENTS AND SETTINGS 44 Span calibration Cal EW type Press ONJOFF key to power ON See that x m Ad J appears after B B B to OFF Refer_to page 10 2 Press F key until CAL appears after Func gt Verify that no load is on the pan Press T key first and press F key together and release both on DO display starts blinking to indicate zero adjustment is performed automatically When zero adjustment is completed display advances toon F 5 indicating the span adjust ment is ready to start Apply calibration weight just in the centre of the pan The display starts blinking to adjust the span exactly When the calibration is completed the display returns to th
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