PEJ-PES Version 1.1
Contents
1. KERN amp Sohn GmbH WAAGEN GEWICHTE BALANCES WEIGHTS Ziegelei 1 Tel 49 0 7433 9933 0 D 72336 Balingen Fax 449 0 7433 9933 149 E Mail info kern sohn com Internet www kern sohn com Service manual Precision balance KERN PEJ PES Version 1 1 4 2009 GB PEJ PES SH e 0911 KERN PEJ PES Version 1 1 4 2009 Service manual Precision balance Contents Ma BASIE IMMOFMANG 3 Zi TOA DOLIO 4 3 EIECIONIC GonstFUCONi eise Pol ide boue de Ev a d Dr 5 3 1 5 9 WAOS VNG e EE EEEE 6 A ErOUDIESHOOUNG 7 4 1 Troubleshooting Procedure 7 4 2 5 Table en 8 4 3 Troubleshoolng able 2 2 rta eei tat eaae exea 9 AA Pumatry CHECKS vases quon te RA er IE EHI 10 4 5 Checks for Electric Electronic Parts 11 4 5 1 Check of VIBA 2A 13 5 Adjustment and Seting x59 E ba voca ovo od toon ub o 14 51 Span Calibration Adjustment with internal weight 14 5 2 Span Calibration Adjustment with external weight PES 15 93 o P DU Mte uec 12. 1 Basic information Grundlegende Hinweise The device must be repaired only by trained specialist staff or personnel with professional formation such as a repair specialist accredited by law concerning verification The service manual is obligatory for repair work After repair original conditions of the device have to be restored Only original spare parts should be used Instructions about conformity evaluated scales Repair must be carried only at 100 compliance with the type approval A violation of this specification will result in a loss of the type approval After successful repair the balance will have to be reverified before it can be used again in a statutorily regulated field Das Ger t darf nur von geschultem oder beruflich ausgebildetem Fachpersonal z B eichrechtlich anerkannter Instandsetzer repariert werden Die Serviceanleitung ist bindend f r Reparaturen Das Ger t muss nach erfolgter Reparatur wieder in den Originalzustand zur ckversetzt werden Es d rfen nur Originalersatzteile verwendet werden Hinweis zu konformit tsbewerteten Waagen Reparatur darf nur in 10096 iger bereinstimmung mit der Bauartzulassung erfolgen Ein Versto gegen diese Vorgabe f hrt zum Erl schen der Bauartzulassung Nach erfolgreicher Reparatur muss eine Nacheichung erfolgen um die Waage wieder im gesetzlich geregelten Bereich verwenden zu k nnen PEJ PES SH e 0911 3 Total View PEJ PES SH e 0911
3. fixing screws 0 F three tuning fork assy tuning fork fixing screws two 24 PEJ PES SH e 091 1 6 9 Adjustment of Overload Stopper Fix the pan base assy to the mechanical unit and put the square pan on it Connect AC adaptor and turn on the switch Change to maintenance mode o os Adjust the overload stopper Square pan Jig to adjust the stopper Adjusting procedure 1 Remove the pan and the pan base 2 Push TARE key to display 0 0 0 3 Put the clearance gauge between the adjusting screw and the chassis then adjust the stopper 4 After adjusting the stopper check the overload error value in referring to the table below Capacity Overload stopper Capacity adjustment 4200 g 0 2 PEJ PES SH e 0911 25 6 10 Sequence of Circuit Board Replacement How to Remove DP N Board 1 Open the case Remove SW spacer and key spacer from DP N board 2 Loose four screws from DP N board 3 Take off the connectors of CN1 CN3 and CN4 on DP board SW spacer Key spacer uU D B 2 x E y j 4 a i Iii La LLL zu LUE RE Seen ALL ui KE 88088 4 DP N board fixing screws four 27 1 How to Install DP N Board 1 Connect the connectors to DP N board CN1 LFM board assy cord CN3 Tuning fork assy co
4. 2005 x 1 20005 x 4 20005 x 7 200 g x1 1000 g x 1 Please use the weight for F1 or higher class to maintain the accuracy 18 PEJ PES SH e 0911 5 5 Calibration of Built In Weight Ref Cal only Set the verification switch to unlocked before doing the calibration of built in weight see drawing Prior to verification the verification switch must be moved into the verification position Position forwards enabled unlocked Position backwards verification position Position verification switch nm A P m N Pm l X Ld While pressing both rare press 8 to ON Release both keys when 8 4 H Lit X l appears After a while display changes to weight value Press 2 be BAE is displayed Verify that no load is on the pan Press first and 3 press key together and release both lan Li ldisplay starts to blinking to indicate zero adjustment is performed automatically When Zero adjustment is completed display advances _ 4 to on F5 indicating the span adjustment is ready to on 675 start 5 Load the reference weight Display starts blinking to adjust the span automatically The calibration is finished and display stops blinking then automatically returns to weighing mode 1 It is recommended to use a weight of full scale capacity for accurate calibration max load 2 Error messages Z LTE re
5. 3 Electronic Construction 3 1 Block Diagram Calibration Weight Unit PEJ only 4 en III in ne oa OO O O O O O ON Zuo PRINT Sat Fasten um LF LEFT REST OFF Tare PEJ PES SH e 0911 3 2 Whole Wiring MECHANISM UNIT Calibration Weight Unit Tuning WES 42 BOARD JJ CIRCUIT BOARD LLLI A T LF Ohe 3 121377 haee GE Battery Unit Option 7206 LM CIRCUIT BOARD 55 oda i JT CIRCUIT BOARD 1 Option UT 00000 ui JL A V p TJ p O O O O O O O O O O O O 0 mar PRINT Zeu Tar nam N J mm E p er mmm Frog NN PEJ PES SH e 0911 4 Troubleshooting 4 1 Troubleshooting Procedure E AC adaptor NO Battery is gt is connected charged B Connect Primary Check AC adaptor Return to START Display Weight O Err U Err NN address data memorized i settled down lt Connectors NG Connected Reset address coefficient Connect plug i cal wight unit Return to primar
6. 1 Preparation for checks Prepare the oscilloscope Turn off the scale and connect probe to CN2 CH 1 1 GND 2 CH 2 3 D 2 3 1 2 Voltage and Frequency range of 3 oscilloscope 4 e Voltage Range 5 CH 1 0 1 0 5V DIV 6 CH 2 1V DIV e Frequency Range 0 2m sec DIV CN 1 1 Power Source 4V 6V 2 GND 3 Power Source 4V 6V 4 Rectangular Wave Output tuning fork 5 GND 6 Rectangular Wave Output temperature 2 How to Check 1 Vibration starts in 3 seconds after turning on the switch of scale 2 Check the amplitude and phase difference of CH 1 and CH 2 as of full capacity is loaded E amplitude CH 1 more than 150mV average 750mV CH 2 more than 700 average 3 5V TX NIX ALY AN lt phase difference 15 120 T 0 3 0 8 division 0 2 PEJ PES SH e 0911 13 5 Adjustment and Setting 5 1 Span Calibration Adjustment with internal weight PEJ The installed adjusting weight allows checking and resetting the weighing accuracy at any time Procedure for adjustment according to the operating instructions Observe stable environment conditions A warming up time of approx 2 hours for stabilisation is necessary Setting 7 CA 1 Display Switch on the balance using the _ Press 1 key Auto CAL is displayed A uto CAL Automatic adjustment is started 9 Calibration wil
7. 2 AC adaptor is defective i Err appears 1 Wrong external calibration weight is used in span calibration External weight is less than 50 of capacity opan error exceeds 1 of capacity in span calibration check the external weight Tuning fork sensor or mechanical unit is defective Something is loaded on the pan in automatic span calibration remove the things from the pan opan error exceeds 1 of capacity in automatic span calibration Tuning fork sensor or mechanical unit is defective 7trr appears Interval time is not properly set consumption The weight error exceeds 100 00mg Re set the y weight error within 100 00mg appears Coefficient memories address data have changed Reset the data Internal clock function is defective Check internal clock and replace DP board if necessary cl Err appears Coefficient memories address data have changed Check the address data and reset it if necessary L Err appears The weight of sample is too light counting mode and mode _ I 5 appears Counting function is not properly operated PEJ PES SH e 0911 9 10 4 4 Primary Checks Is any wind around the site Is any oscillation Is the working table stable Is anything under the pan base or the weighing pan Is the weighing pan the right one Is AC adaptor connected both with the scale and with the scale and with the outlet properly Is bat
8. 20A 1 9 RS232C PCB ASSY 22AE053 1 10 RS BLIND 220062P 1 11 RS BRACKET 220069P 1 12 PCB SPACER FOR RS232 3166C 2 RS232 13 RS SUTTER 220073P 1 14 RS PACKING 220090P 1 15 REAR SHUTTER 220066P 1 16 NYLON RIVET NRP 355 22CNOL3 2 with rear shutter 220066P 17 LF PCB ASSY D2AE055 1 18 LF PCB SUPPORT PLATE 220071P 1 19 LF COVER 220032P 1 20 DP N PCB ASSY 22AE06 1 20 1 FD DISPLAY 220E003 1 20 2 TACT SWITCH 225 001 1 20 3 SLIDE SWITCH 11SWO02 10 21 SW SPACER 2200151 1 22 KEY SPACER 2200161 1 23 TF SENSOR CODE 22AE056 1 24 IBA 2A 3 Assy 008 1 25 5 22AE70P 1 26 PCB SPACER FOR VIBA 2A 3166C11 1 VIBA 2A 3 PCB 27 NYLON CLAMP NK 2N 007 2 28 HEAT SHUTTER PLATE 220068P 1 29 MECHANICAL UNIT 1 29 1 TUNING FORK SENSOR ASSY 1 30 SUB PAN BASE ASSY 22006A 1 31 UPPER CASE 2200111 1 32 DISPLAY PANEL SHEET 220063P 1 33 SWITCH PANEL SHEET 220064P 1 34 DUST COVER 2200141 1 35 PROTECTOR 220065P 1 36 PAN BASE ASSY 220063A 1 36 1 PAN GUIDE 30711 4 26 2 1064 220 014 1 37 SQUARE PAN 220067P 1 38 A AC ADAPTER AC230 IN DC12V OUT 0 083 1 38 B AC ADAPTER AC120 IN DC12V OUT 0 092 1 PEJ PES SH e 0911 31 1 iew of Components PES 31000 8 3 V A33487P 21 16 15 1 or 15 2 12 1 or 12 2 1 1 1 2 HJ 31K CHASSIS HJ 21K CHASSIS ADJUSTER FOOOT 25 LEVEL ASSY LEVEL ASSY HJLF PCB ASSY HJ DP PCB ASSY HJ DP N PCB ASSY HJ VFD DISPLAY HJSW SPACER HJ RS232C PCB ASSY HJK
9. 6 LineaHliy sierden 17 5 4 1 Table Increasing Calibration Weight for Linearity Adjustment 18 5 9 Calibration of Built In Weight Ref only 19 6 Parts Replacement ssiri diari 20 6 1 How to Remove the 20 62 HOWTO COVER UNG e 20 6 3 Howto Replace Mechanical Unit 21 6 4 How to Remove Mechanical 21 6 5 Howto Install Mechanical 22 6 6 Sequence of Tuning Fork Sensor Replacement 23 67 How to Remove Tuning Fork 23 6 8 Howto Install Tuning Fork 24 6 9 Adjustment of Overload 25 6 10 Sequence of Circuit Board Replacement 26 I T TT 27 7 1 Installation of Battery Option a 27 7 2 Installation of Relay Contact Option 20 0 mE T nM an amd 30 8 1 EXDIOSIOM DIAGRAM REN E 30 C2 BNO ML 31 8 3 View of Components PES 31000 1 32 2 PEJ PES SH e 0911
10. EY SPACER HJ TF SENSOR CORD HJ 31K MECHANICAL UNIT HJ 21K MECHANICAL UNIT VIBA 2A 3 ASSY HJ 30K TUNING FORK SENSOR ASSY HJ 31K UPPER CASE HJ 21K UPPER CASE HJ 31K PANEL SHEET MC K COVER PAN BASE HOLDER PAN GUIDE CUSSION LOAD SETTER PAN AC ADAPTER AC230 IN DC12V OUT AC ADAPTER AC120 IN DC12V OUT 220306P 220216P 30801 3263 3120 22 055 22 05 22 06 220E003 2200151 22 053 2200161 22AE056 220183A 220151A 008 220150 220307 220215 220229 220204 3213C 30161 3401 4020P UMO83 UM092 PEJ PES SH e 0911 32
11. e in the scale correctly Tuning fork sensor or mechanism unit is defective Zero points drifts Affected by wind or disturbing oscillation Check environment or working base Check also setting of stabilization time Oo Err appears with a net Gross weight applied to the scale pan net load less than specified weight tare value exceeds the scale capacity capacity Setting of address data has mistake Coefficient memories address data have changed by noises or static electricity Adjust linearity Wrong external calibration weight is used in span calibration Internal calibration weight touches other parts opan is out of specified Tuning fork sensor or mechanism unit is range defective DP board is defective Setting of address data has mistake Coefficient memories address data have changed by noises or static electricity Adjust linearity Linearity is out of specified Tuning fork or mechanism unit is defective range Setting of address data has mistake Coefficient memories address data have changed by noises or static electricity Adjust linearity Wrong external calibration weight is used in span calibration u Err or o Err appears self test of segment IN 8 PEJ PES SH e 0911 4 3 Troubleshooting Table 2 1 Mechanical unit is defective such as roberval plate spring has been bent or twisted 2 Pan base touches other parts 1 DP board is defective isappeared
12. ference weight is over than the full capacity i Lr The reference weight is less than 72 of the capacity Er r The data error exceeds 1 of the capacity 3 Itis recommended to use reference calibration weight of better accuracy than the scale PEJ PES SH e 0911 19 6 Parts Replacement 6 1 How to Remove the Case 1 Remove pan and pan base 2 Remove three screws fixing the case x 8 Screws M3 x 15 Screw 6 2 How to Cover the Case 1 Cover the case 2 Fixing the case with screws Put the pan base and the 20 PEJ PES SH e 0911 6 3 How to Replace Mechanical Unit Mechanical Unit is defective 4 Replace Mechanical Unit i Reset address data data of replacing mechanical unit l Span Calibration i Adjust the overload stopper 6 4 How to Remove Mechanical Unit 1 Remove the case 2 Remove the cords black and white of tuning fork assy from VIBA board assy remove the solder 3 Remove nylon cramp fixing cords of tuning fork assy Cord of tuning fork assy black white M3 screw Nylon cramp 4 Remove four bolts fixing mechanical unit 5 Remove the mechanical unit from the chassis PEJ PES SH e 0911 21 22 Radiation Shield bottom 7 6 5 How to Install Mechanical Unit 1 Put the mechanical unit on the chassis take care to put radiation shield between the chassis and the mechanical unit 2 Solder the cord
13. iagram 16 PEJ PES SH e 0911 5 4 Linearity Adjustment oet the verification switch to unlocked before doing the linearity adjustment see drawing Prior to verification the verification switch must be moved into the verification position Position forwards enabled unlocked Position backwards verification position gt Position verification switch While pressing both 9 press to ON Release both ENE keys when L i H Li Li X appears maintenance mode After a while display changes to weight value Press until L Lt appears after displaying 1 am L display starts blinking to indicate zero adjusting is performed automatically lam c Put the weight referring to the table at the next mm 3 dio Returns to weight value after reading 2 d J Press to turn off Power and press again Then return to normal weighing mode PEJ PES SH e 0911 17 5 4 1 Table Increasing Calibration Weight for Linearity Adjustment Model 220 g 420 g 620 g 2200 g Display Og EEN 0020 0s Og __ an 50g 1009 150g 500 ani ZUR Calibration Weight Required TRENT 50g x4 100 5x4 900 g x 4 209 1 20g x1 2005 x 1 Model 4200 g 62000 8200 g 15000 g Display om i Oo Og Og Og __ mn 10050 1500 2000 g 3000 g 2000 9 3000 g 4000 9 7000 9 mn 3000 g 4500 9 6000 g 11000 g an 4 4200 g 6200 g 8200 g 15000 g Calibration 1000 9x 4 Weight en 500 s x 4 Required
14. l be carried out automatically Calibration process has been concluded 14 PEJ PES SH e 0911 5 2 Span Calibration Adjustment with external weight PES Procedure for adjustment according to the operating instructions Observe stable environment conditions A warming up time of approx 2 hours for stabilisation is necessary Setting 7 CA 3 Display owitch on the balance using the key Press 1 key Zero point will be saved Carefully place adjusting weight in the centre of the weighing plate Adjustment process is started The process of adjustment is completed Remove adjusting weight balance will return into weighing mode automatically In case of an adjustment error or incorrect adjusting weight the display will show Err repeat adjustment process PEJ PES SH e 0911 15 5 3 Corner Error Adjustment 1 Remove the case then after setting the pan base and the pan turn the adjuster legs to bring the bubble of the level to the center of the circle 2 Push nylon rivet from the inside and remove the rear shutter 3 Load full scale weight and push T key Check the corner error referring to the diagram below LJ Adjusting Bolt A Adjusting Bolt B B Rear shutter Nylon rivet The error is positive to the center The error is negative to the center Drive the bolt counter clockwise CN Drive the bolt clockwise Corner Error Adjusting D
15. rd CN4 RS Board assy cord 2 Fix DP N board with screws 3 Fix SW spacer and key spacer Key Spacer re TE Bar gt CN3 This projection should be on right lower side PEJ PES SH e 091 1 26 T Installation of Options 7 1 Installation of Battery Option Remove the case Fix battery assy to the chassis with two screws Fix cords of BT board assy with nylon cramp and two screws Connect the cord of BT board assy to CN2 of DP N board Put BATTERY label on the AC adaptor screws HJ BT Board assy M3x8 screws nylon cramp CN2 connector PEJ PES SH e 091 1 27 28 7 2 Installation of Relay Contact Option 1 Remove the case 2 Fix LM board assy to the chassis with two screws M3 x 10 screws 9 v X LM board assy PEJ PES SH e 091 1 Fix cords of LM board assy with LCD packing and connect the cords to of display board 4 Put RELAY label CN 7 RELAY label PEJ PES SH e 091 1 29 8 Parts List 8 1 Explosion Diagram PEJ PES SH e 091 1 30 8 2 Bill of Material POS DESCRIPTIONS PARTS Q TY REMARKS 1 CHASSIS 2200121 1 2 ADJUSTER 2000341 4 3 HOLE PLUGDP 312 110002J 1 4 SHUTTER 3190P 1 5 DP PCB SUPPORT PLATE 220072P 1 6 LCD SPACER 3650P 1 7 LCD PACKING 7398P 1 8 LEVEL ASSY 31
16. s of tuning fork sensor to VIBA board assy black cord to 1 and white cord to 3 referring to the picture below 3 Fix the cords of tuning fork sensor with nylon cramp be sure these cords are not touch with other parts 4 Cover the case black cord white cord M3 screw gt ls nylon cramp I i T t re d ei 2 a 2s EC ees PEJ PES SH e 091 1 6 6 Sequence of Tuning Fork Sensor Replacement Tuning Fork sensor is defective i Replace Tuning Fork sensor Linearity adjustment Adjust the overload stopper Performance check 6 7 How to Remove Tuning Fork Assy 1 Remove the mechanical unit from the chassis 2 Remove the sub pan base assy by loosing three screws on the mechanical unit 3 Loose two screws to remove tuning fork assy 4 Replace tuning fork assy gt Three screws fixing sub pan E gt base assy lt tuning fork assy two screws fixing tuning fork assy PEJ PES SH e 091 1 23 6 8 How to Install Tuning Fork Assy 1 Temporarily fix tuning fork assy to mono metal block 2 Fix sub pan base assy to mono metal block with screws torque 52 5kgfem 3 Tightly fix tuning fork assy with screws while putting the weight 10kg on the sub pan base assy torque 30kgfcm sA sub pan base Uu
17. tery option charged sufficiently PEJ PES SH e 0911 4 5 Checks for Electric Electronic Parts 11 IND a owe E ez st 2 MN mim mim mmo C98 gy Sal lm Lg mim mm sms cml c t ls LEE 2 mjn Zonen 20 LEE E m M o C94 94 mim mm 95 22 e gt 5 e mle mim 4022 2014 Em 094 3 _ _ 2 m g es IM 2 n zo NN ann n SS NI a PD70F 3033 1982082829888 11 a 6 101 00 E HS m ALLL i MITTIT zu Sed tales nin EDU Mer Vues ROLE dr d e CA mij m 9v8 BI 614 EREN m ZNO lm TER 2181 PEJ PES SH e 0911 1 Check of input voltage TPO CN1 CD 12V 14V 2 Power voltage in the circuit TP1 4 75V 5 25V TPO IC13 O 9 5V 10 5V TPO D13 anode 3 V 4 3V 010 cathode 23 5V 24 5V 3 Check of signal wave TPO TP3 tuning fork waveform oV 0 4 0 7msec 25 1 5kHz TPO TP4 temperature waveform oV 3 3 Omsec 300 200 2 D13 anode IC11 6pin VFD filament frequency 55 50usec 18 20kHz VFD1 1 pin 56 pin 4V x OV II E 55 50 18 20kHz 12 PEJ PES SH e 0911 4 5 1 Check of VIBA 2A board
18. y check Return to Primary Check NG NG Check gt Readjustment Stoppers of Stopper OK er Return to Primary Check Didplay changes according to load Check comer error Adjust comer error Voltages NG on PCB Check Linearity OK Scale is normal OK Scale is normal Adjust Linearity LF Board NG is normal OK Board DP N LF Board is defective is defective NG Check signal Waves Tuning folk is Mechanical unit pn i Replace defective is defective p DP N Board LF Board E c NET Ld Replace lt mechanical unit Replace tuning folk PEJ PES SH e 0911 7 4 2 Troubleshooting Table SYMPTOMS CAUSES amp REMEDY No display lights on DP board is defective AC adaptor is defective Wrong connection of connection cords inside Built in battery is discharged Wrong weighing pan is applied Tuning fork sensor or mechanism unit is defective DP board is defective Setting of address date has mistake Coefficient memories address data have changed by noise or static electricity Adjust linearity Display does not get settled Some parts such as stopper touch others down Internal calibration weight touches other parts Weighing pan touches other parts Display does not repeat Foreign substances ar
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