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4.7 Linearity Adjustment

1. How To Adjust Linearity

EW-C Type

EG type

- 20 - EW_EW-C_EG_N-SH-e-0722

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Summary of Contents for EG

Page 1: ...alingen Frommern E Mail info kern sohn com Tel 0049 0 7433 9933 0 Fax 0049 0 7433 9933 149 Internet www kern sohn com GB Service Manual Electronic Precision Balances Page 2 KERN EW EW C EG N Version 2...

Page 2: ...ks 10 3 4 Checks For Electric Electronic Parts 11 4 ADJUSTMENTS AND SETTINGS 12 4 1 Span Calibration CAL 12 4 1 1 EW and EW C Type 12 4 1 2 EG Type 13 4 2 Lock Switch 14 4 3 Corner Error Adjustment 15...

Page 3: ...36 5 5 1 How to uninstall Tuning fork assy 36 5 6 Sequence Of The AJDP Circuit Board Replacement 37 5 6 1 How To Remove AJDP Circuit Board 37 5 6 2 How To Install AJDP Circuit Board 38 5 7 How To Rem...

Page 4: ...1 Total View 1 1 Total View Of EW Type 220 12000g 1 2 Total View Of EG Type 220 620g 2200g 4200g 4 EW_EW C_EG_N SH e 0722...

Page 5: ...1 3 Total View Of EW C Type 600ct 120g 1 4 Total View Of EW Type 120g 0 0002g 5 EW_EW C_EG_N SH e 0722...

Page 6: ...2 Electronic Construction 2 1 Block Diagram EG EG AC Adaptor 6 EW_EW C_EG_N SH e 0722...

Page 7: ...2 2 Whole Wiring EG EG 7 EW_EW C_EG_N SH e 0722...

Page 8: ...3 Troubleshooting 3 1 Troubleshooting Procedure 8 EW_EW C_EG_N SH e 0722...

Page 9: ...cted by a wind or disturbing oscillation Check environment or working base Check also setting of stabilization time See operation manual o Err appears with a net load less than specified capacity F S...

Page 10: ...earity d Err appears 1 Address data related to determine the capacity has been destroyed Contact the shipper 2 AJDP board is defective I Err appears 1 The calibration weight is less than F S 2 Err app...

Page 11: ...carried out on back of AJDP board after removing the upper case at test Points and Pins of CN1 CN4 TP4 and TP6 1 Check of input voltage TP0 1 of CN1 8V 12V 2 Power voltage in the circuit TP0 2 of CN4...

Page 12: ...ale 2 The calibration is available with of F S Nevertheless it is recommend to use weight closer to F S for accurate calibration 3 Error messages o Err The calibration weight is over the full capacity...

Page 13: ...4 1 2 EG Type 13 EW_EW C_EG_N SH e 0722...

Page 14: ...4 2 Lock Switch Set the lock switch to Locked before stamping or sealing so that the user is unable to change parameters or to calibrate the scale 14 EW_EW C_EG_N SH e 0722...

Page 15: ...eferring to 5 1 Place the pan base then place the weighing pan on the mechanism Adjust the level Remove fixing screw on AJDP board and unplug connector with CN4 on AJDP board Adjust corner errors by a...

Page 16: ...4 3 2 EW 2200 12K 16 EW_EW C_EG_N SH e 0722...

Page 17: ...4 4 Adjustment Sequence For Cases 17 EW_EW C_EG_N SH e 0722...

Page 18: ...mories of address data are changed or lost by some reasons such as by replacement of PCB or by noises or static electricity re set original data by following procedure 1 Location Of Original Data 2 Co...

Page 19: ...4 6 How To Call Address Mode How To Re write Address Data EW C Type 19 EW_EW C_EG_N SH e 0722...

Page 20: ...4 7 Linearity Adjustment 1 How To Adjust Linearity EW C Type EG type 20 EW_EW C_EG_N SH e 0722...

Page 21: ...eight Required 50g x 4 20g x1 100g x 4 20g x 1 100g x 4 50g x 4 20g x 1 200g x 4 20g x 1 Model Display EW 2200 2NM EG 2200 2NM EW 4200 2NM EG 4200 2NM EW 6200 2NM EW12000 1NM on 0 0g 0g 0g 0g 0g 0g 0g...

Page 22: ...4 NM on 0 0g 0g 0g 0g on 1 30g 30g 30g 30g on 2 30g 60g 30g 60g on 3 30g 90g 30g 90g on 4 30g 120g 30g 120g Calibration Weight Required 20g x 4 10g x 4 20g x 4 10g x 4 Please use the weight for E2 OI...

Page 23: ...Following does not describe the procedure of ordinary span calibration This is the procedure of calibration of the built in weight with EG scales It is necessary to adjust the linearity of the scale...

Page 24: ...quality tolerance of the reference weight determine the accuracy of the scale Use weights of higher accuracy than the scale 3 Adjust the level beforehand The REF CAL must be done in a good environment...

Page 25: ...lug the AC adaptor Remove the pan and pan base 2 Remove case fixing screw with a screwdriver 3 Locate two hooks beneath the scale near front Pull those two hooks toward you to lift the case up then sh...

Page 26: ...5 1 2 EW 2200 12K 1 Remove the weighing 2 Remove case fixing screw with a screwdriver 2 places in the top and 1 place in the chassis 26 EW_EW C_EG_N SH e 0722...

Page 27: ...g the AC adaptor Remove the pan and pan base 2 Remove case fixing screw with screwdriver 3 Locate two hooks toward you to lift the case up then shift the case to rear to release it from hooks 27 EW_EW...

Page 28: ...5 1 4 EW 120 4 NM 28 EW_EW C_EG_N SH e 0722...

Page 29: ...case gently until two front hooks are set securely 2 Drive in case fixing screw securely 3 Set pan base and then weighing pan on the scale 5 2 2 EW 2200 12K 1 Put the case on properly catching connect...

Page 30: ...5 3 Sequence Of Mechanism Unit Replacement 30 EW_EW C_EG_N SH e 0722...

Page 31: ...and EW C 1 Remove the case referring to 5 1 2 Remove four sensor cover fixing screw 3 Remove wires to the tuning fork sensor by welding solders at AJDP circuit board 4 Remove the AJDP circuit board fi...

Page 32: ...sm unit by holding the chassis Mechanism unit fixing screws 5 3 1 2 EW 2200 12K 1 Remove the case referring to 5 1 2 Remove wires to the Tuning fork sensor by welding solders at AJDP circuit board 3 R...

Page 33: ...Weighing Mechanism 1 Place the mechanism on the chassis Fit it with the fixing screws 2 Solder wires of the Tuning fork sensor to the AJDP circuit board 3 1 Cover the mechanism unite with the sensor c...

Page 34: ...5 4 Plate Rib Replacement 34 EW_EW C_EG_N SH e 0722...

Page 35: ...ng fork sensor 3 Attach the fixing jig with fixing screws for the tuning fork sensor assy The fixing jig should be attacked to the guide link 4 Remove the damaged plate rib by unscrewing and fix the n...

Page 36: ...How to uninstall Tuning fork assy 1 Remove the mechanical unit from the chassis 2 Replace the tuning fork sensor 3 Insert shim at stopper 4 While holding guide link down to under direction tighten scr...

Page 37: ...e referring to 5 1 2 Remove wires to the Tuning fork sensor by welding solders at AJDP circuit board 3 Remove the AJDP circuit board fixing screw 4 Unplug connectors at CN1 CN4 and CN3 with AJH CE on...

Page 38: ...f the Tuning fork sensor to the new AJDP board 2 Plug connectors CN1 AJLF cord CN3 Calibration cord CN4 AJIF cord CN5 Battery cord 3 Place the AJDP board on the chassis Fix it with a fixing screw 4 Co...

Page 39: ...620 1 Remove the CN3 connector Removing AJDP P C B in advance makes it easy to do it 2 Remove cut the cord band 3 Unscrew at two points 5 7 2 EG 2200 4200 1 Remove SW cord assy from AJDP circuit boar...

Page 40: ...Weight Holder 3 Remove the side ring and disassemble the weight Weight Fixing Screw Side Ring 4 Remove the weight shaft from the mechanical main unit Weight Shaft 40 EW_EW C_EG_N SH e 0722...

Page 41: ...5 8 How To Install Calibration Weight Unit Follow the instruction in 5 7 by the opposite order Refer to the position for the installation below 41 EW_EW C_EG_N SH e 0722...

Page 42: ...6 1 1 EW 120 1200 and EW C 1 Remove the case referring to 5 1 2 Plug AJ battery cord to CN5 on AJDP board 3 Install AJ battery holder assy 4 Cover the scale and stick battery label above power jack o...

Page 43: ...CN5 on AJDP board 3 Fasten the AJM battery held together into the nylon clamp which has holed the cord of the AJMIF circuit board assy Nylon Clamp AJMBT Assy 4 Cover the scale and stick the battery la...

Page 44: ...7 Parts List 7 1 EW 220 1200 EW 220 420 620 EG 220 420 620 EW 820 1200 EG 220 420 620 44 EW_EW C_EG_N SH e 0722...

Page 45: ...7 2 EW 2200 12K 45 EW_EW C_EG_N SH e 0722...

Page 46: ...7 3 EW C EW 120 4 NM EW 600 C3 NM EW 120 4 NM 46 EW_EW C_EG_N SH e 0722...

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