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KERN KERN AEJ, Service Manual

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KERN KERN AEJ Service Manual Download Page 26

6.3  The Sequence of Mechanical Unit Replacement 

 

1. How to remove the mechanical unit 

 

a 

a. Open the case and remove nylon cramp fixing 
    the connector cables.

 

 

 

 

 

 

b. Pull out RS cable from LF board (power source board). 

 

 

 

b 

 

 

 

 

 

 

 

 

 

 

 

c 

c. Loose four screws, and remove the sensor cover. 
    sensor cover 

 

 

 

 

 

 

 

d. Attach “mono-metal fixing block” to the 
    mechanical unit. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

e. Loose two bolts fixing the weight stay, 
    and remove the weight stay. 

 

 

 

 

Weight stay 

 

d

e

Sensor cover 

Mono-metal fixing 
block 

 

 

 

 

 

 

26

Summary of Contents for KERN AEJ

Page 1: ... Ziegelei 1 D 72336 Balingen E Mail info kern sohn com Tel 49 0 7433 9933 0 Fax 49 0 7433 9933 149 Internet www kern sohn com Service manual Analytical balances KERN AEJ AES Version 1 0 4 2009 GB AEJ AES SH e 0910 1 ...

Page 2: ...justment with external weight AES 14 5 3 Verification switch and seals 15 5 4 Corner Error Adjustment 16 5 5 Linearity Adjustment 17 5 5 1 Linearity Adjustment of AES 120 4 and AEJ 120 4M 17 5 5 2 Linearity Adjustment of AES 220 4 and AEJ 220 4M 18 5 6 Calibration of Built In Weight Ref Cal only AEJ 19 5 7 Address Data Check and Re setting 20 5 8 Adjustment of Overload Stopper 22 6 Parts Replaceme...

Page 3: ...uccessful repair the balance will have to be reverified before it can be used again in a statutorily regulated field Das Gerät darf nur von geschultem oder beruflich ausgebildetem Fachpersonal z B eichrechtlich anerkannter Instandsetzer repariert werden Die Serviceanleitung ist bindend für Reparaturen Das Gerät muss nach erfolgter Reparatur wieder in den Originalzustand zurückversetzt werden Es dü...

Page 4: ...2 Total View Windshield Weighing plate Protection ring Air bubble LCD display RS 232 interface Printer interface Connection mains adapter Foot screw Underfloor weighing device Foot 4 ...

Page 5: ...3 Electric Electronic Construction 3 1 Block Diagram Calibration Weight Unit AEJ only PRINT 5 ...

Page 6: ...3 2 Whole Wiring Calibration Weight Unit AEJ only PRINT 6 ...

Page 7: ...4 Troubleshooting 4 1 Troubleshooting Procedure 7 ...

Page 8: ... disturbing oscillation o Err appears with net load less than full capacity 1 Gross weight applied to the scale pan net weight tare value exceeds the scale capacity 2 Setting of address data has mistake 3 Coefficient memories address data have changed by noise or static electricity Re set the address data and or adjust the linearity 4 Wrong external weight is used in the span calibration Span erro...

Page 9: ...used in span calibration external weight must be more than 50 of scale capacity appears 1 Span error exceeds 1 of scale capacity in span calibration Check the external weight appears 1 During calibration there was a weight on the weighing plate Remove it from the pan appears 1 Span error exceeds 1 of capacity in automatic span calibration appears 1 Interval time is not properly set appears 1 Inter...

Page 10: ...h or remove pan pan base windshield take care no dust and or liquid gets into the Pan base Pan 3 Is the weighing pan the right one 4 Is the windshield properly attached 5 Is the working table stable 6 Is the balance installed in level Position of the air bubble in the level Adjuster 7 Is the AC adaptor properly connected both with scale and with outlet AC adapter connector 10 ...

Page 11: ...4 4 Check of Electric Electronic Parts 1 Check of HT DP board 11 ...

Page 12: ...4 75V 5 25V TP0 TP2 3 15V 3 45V TP0 IC12 O 7 6V 8 4V TP0 IC13 OUT 2 65V 2 95V TP0 D3 kasode 2 0V 2 4V TP0 IC8 5 8 4V 7 6V 4 Check of signal wave TP0 IC1 39 19 968MHz TP0 TP4 38 4MHz Check of tuning fork vibration 800 1000Hz CH1 TP0 TP6 P P 200mv or more CH2 TP0 TP5 P P 9V or more 12 ...

Page 13: ... Function menu 1 setting x CA 1 Ö Press the CAL key AWT CAL CAL PWSH C CAL Ö Press the CAL key again and adjustment will take place automatically AWT CAL CAL CH O 1 CAL CH F S 1 CAL Ö The process of adjustment is completed Adjustment protocols will be issued automatically if you connect an optional printer see chpt 15 printer mode Whilst printing is in progress busy will be displayed EnD CAL Ö The...

Page 14: ...1 K PWSH C CAL Ö Press the CAL key again zero point will be saved EHT CAL CAL 1 K Qn O CAL Ö When display on F 5 appears put the adjusting weight carefully in the centre of the weighing pan CAL Qn F 5 Ö The adjustment process is started CAL Qn F 5 Ö The process of adjustment is completed Adjustment protocols will be issued automatically if you connect an optional printer see operating instructions...

Page 15: ...itions Seal of approval Seal of approval Fig 1 Move verification switch to verification position Seal rubber plug verification switch Access to the verification switch is achieved by removing the possibly existing seal veri fication becomes invalid and the rubber plug Position of verification switch Status forwards Balance is unlocked for the adjustment process ad justment will be possible ADJ app...

Page 16: ... weight to B and C To adjust bolts R and L referring to the table below so that the corner error is within the specified range 基準点 C A corner error adjustment table B Error is positive to the center Error is negative to the center Drive the bolt clockwise Drive the bolt counter clockwise Bolt L Bolt R Display A B C L R Display A B C L R Display A B C L R Display A B C L R 16 ...

Page 17: ...x appears maintenance mode 2 After a while display changes to weight value not the zero point Press until appears after displaying 3 While pressing first press together and release both 4 starts blinking to indicate zero adjustment is performed automatically 5 When display changes to blinking put the external weight on the pan according to the table below 6 When display appears press key The displ...

Page 18: ...release both 5 starts blinking to indicate zero adjustment is performed automatically 6 When appears put the external weight of 100g on weigh ing pan The display changes to put additional 120g 220g in accumulate on weighing pan 7 appears again Remove 120g 100g remains on the pan The display changes to Remove 100g nothing on the pan 8 When display changes to blinking put the external weight on the ...

Page 19: ...ress together and release both After a while starts blinking 3 When appears put the external weight of full capacity on weighing pan max 120g 120g max 220g 220g 4 starts blinking The display changes to after displaying 5 Remove external weight from the pan 6 The display changes When internal calibration is successfully completed appears on the display 7 Press key to return to normal weighing mode ...

Page 20: ... 41 98 22 12 9B 32 08 85 19 30 00 27 56 62 80 10 00 18 27 39 26 72 17 12 18 99 72 27 8D 49 27 61 48 20 84 33 77 69 92 20 20 00 28 00 00 20 10 00 00 00 0A 30 06 07 02 0B 07 00 00 FF 38 1C 0B 14 53 0A 00 00 00 40 00 00 00 00 00 00 00 00 48 00 00 5F 左からAdr 00 07 左からAdr 08 0F 左からAdr 10 17 左からAdr 18 1F 左からAdr 20 27 左からAdr 28 2F 左からAdr 30 37 左からAdr 38 3F 左からAdr 40 47 左からAdr 48 4A 音叉番号 プログラム番号 Number of ...

Page 21: ... first step 5 Press once then numerical number in this case shifts to upper digit Set numerical number by pressing the key once 6 Press to display a numerical number at the right side 7 Press key to select in the right side By pressing key you set in addr and move to next address 8 Input other data by the same procedure When you set data in all the address the balance returns to normal weighing mo...

Page 22: ... to the picture 3 Adjust the level of the balance Stopper adjustment block 4 Lose stopper fixing screw on the side of mechanical unit 5 Press and check whether the indication is stable 6 Adjust the stopper by sliding the stopper the stopper should slightly touch with guide link 7 Fix the stopper fixing screw Stopper fixing screw 22 ...

Page 23: ...eplacement 6 1 How to Remove the Case 1 Remove the weighing pan and pan base Weighing Pan Pan Base 2 Remove the WS Ring by turning it counter clockwise WS Ring 3 Remove the windshield 4 Remove the upper case 23 ...

Page 24: ...er 6 1 b Remove wires to tuning fork sensor by welding solders at HT DP board c Loose and remove fixing screws d Pull out all connectors and remove HT DP board e Solder wires of tuning fork sensor to HT DP board White White Black G G G f Plug connectors g Place HT DP board on the chassis and fix the screws 24 ...

Page 25: ...eplacement of HT DP board Replacement with new HT DP board Address data re setting Span Calibration Linearity Adjustment See 5 7 See 5 5 See 5 1 5 2 See 4 3 See 5 6 Calibration of internal weight AEJ only Performance check 25 ...

Page 26: ... fixing the connector cables b Pull out RS cable from LF board power source board b c c Loose four screws and remove the sensor cover sensor cover d Attach mono metal fixing block to the mechanical unit e Loose two bolts fixing the weight stay and remove the weight stay Weight stay d e Sensor cover Mono metal fixing block 26 ...

Page 27: ...ll out the connectors and remove HT DP board f g Remove internal weight ASSY first and then remove span weight span weight g2 g1 internal weight ASSY h Loose three screws and remove the mechanical unit h 27 ...

Page 28: ...weight stay g Put the sensor cover h Connect RS cable to LF board power source board and attach the nylon cramp 3 Adjustment after the replacement with new mechanical unit In case of any defection in the mechanical unit the mechanical unit should be replaced with new one After the replacement with new mechanical unit please make following adjustment and setting Replacement with new mechanical unit...

Page 29: ...nsor 3 Install new tuning fork sensor to the mechanical unit with two bolts torque 20kgfcm 4 Install the mechanical unit to the chassis see 6 3 2 Adjustment after the replacement of tuning fork sensor Replacement with new mechanical unit Corner Error Adjustment See 5 4 Calibration of internal weight AEJ only Span Calibration Adjustment of overload stopper Performance check Linearity Adjustment See...

Page 30: ...7 Parts List 7 1 Explosion Diagram 30 ...

Page 31: ... 2 for 220g capacity model 16B CAL WEIGHT M 270007C 2 for 120g capacity model 17 WEIGHT STAY 270010P 1 18 UPPER CASE 270001I 1 19 BASE PLATE 270002P 1 20 PANEL 270001P 1 21 CHASSIS ASSY 270013I 1 22 LEVEL ASSY 270015A 1 23 ANTI VIBRATION RUBBER 270002J 1 24 M5 Φ16 FLAT WASHER MS0273 1 25 M5 NUT M5NT1S 1 26 MECHANICAL ASSY 270009A 1 26 1 HT 220 TUNING FORK SENSOR 270010A 1 27 SENSOR COVER 270012I 1...

Page 32: ...ent Repeatability 1 Corner Error 2 Non Linearity AES 120 4 AEJ 120 4M 0 0001g 0 0005g 0 0003g AES 220 4 AEJ 220 4M 0 0001g 0 0005g 0 0003g 1 standard deviation 2 1 3 of full capacity loaded Repair Tool List 1 Mono metal fixing block 2 Stopper adjustment block 32 ...

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