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Table of Contents
Troubleshooting
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Summary of Contents for KERN EW
- Page 1 KERN & Sohn GmbH Ziegelei 1 Tel: 0049-[0]7433- 9933-0 D-72336 Balingen-Frommern Fax: 0049-[0]7433-9933-149 E-Mail: info@kern-sohn.com Internet: www.kern-sohn.com Service Manual Page 2 Electronic Precision Balances KERN EW · EW-C · EG (N) Version 2.2 01/2007 - 1 - EW_EW-C_EG_N-SH-e-0722...
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Page 2: Table Of Contents
Total View Of EW Type - 220-12000g............4 Total View Of EG Type - 220-620g, 2200g, 4200g........4 Total View Of EW-C Type - 600ct (120g) ........... 5 Total View Of EW Type - 120g/0,0002g ............. 5 ELECTRONIC CONSTRUCTION ................6 Block Diagram .................... - Page 3 INSTALLATION OPTIONS ...................42 Installation Of Battery Option ..............42 6.1.1 EW 120-1200 and EW-C..............42 6.1.2 EW 2200-12K..................43 PARTS LIST......................44 EW 220-1200 ..................... 44 EW 2200-12K ..................... 45 EW-C / EW 120-4 NM ................46 - 3 - EW_EW-C_EG_N-SH-e-0722...
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Page 4: Total View
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: Total View Of Ew-C Type - 600Ct (120G)
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: Electronic Construction
2 Electronic Construction 2.1 Block Diagram AC Adaptor - 6 - EW_EW-C_EG_N-SH-e-0722... -
Page 7: Whole Wiring
2.2 Whole Wiring - 7 - EW_EW-C_EG_N-SH-e-0722... -
Page 8: Troubleshooting
3 Troubleshooting 3.1 Troubleshooting Procedure - 8 - EW_EW-C_EG_N-SH-e-0722... -
Page 9: Trouble Shooting Table
3.2 Trouble shooting Table Symptoms Causes & Remedy No display lights on. 1. AJDP board is defective. 2. AC adapter is defective. 3. Wrong connection of connection cords inside. 4. Built-in battery (option) is discharged. u-Err o-Err 1. Wrong weighing pan is applied. 2. -
Page 10: Primary Checks
Symptoms Causes & Remedy Corner error is too much. 1. Mechanism unit is defective, such as Roberval plate (Spring) has been bent or twisted. 2. Pan base touches other parts. Display suddenly 1. Built-in battery (option) has been consumed. disappeared in operation. 2. -
Page 11: Checks For Electric/Electronic Parts
3.4 Checks For Electric/Electronic Parts -AJDP Circuit board- Checks for electric/electronic parts are to be 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 of CN1 ••••••... -
Page 12: Adjustments And Settings
4 Adjustments and Settings 4.1 Span Calibration (CAL) 4.1.1 EW and EW-C Type 1. It is recommended to use a calibration weight of better accuracy than the scale. 2. The calibration is available with ½ of F.S. Nevertheless, it is recommend to use weight closer to F.S. -
Page 13: Eg Type
4.1.2 EG Type - 13 - EW_EW-C_EG_N-SH-e-0722... -
Page 14: Lock Switch
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: Corner Error Adjustment
4.3 Corner Error Adjustment 4.3.1 EW – 120-1200 and EW-C Type Remove the case referring 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. -
Page 16: Ew - 2200-12K
4.3.2 EW – 2200-12K - 16 - EW_EW-C_EG_N-SH-e-0722... -
Page 17: Adjustment Sequence For Cases
4.4 Adjustment Sequence For Cases - 17 - EW_EW-C_EG_N-SH-e-0722... -
Page 18: Resetting Address Data (Coefficients)
4.5 Resetting Address Data (Coefficients) When memories 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. -
Page 19: How To Call Address Mode/How To Re-Write Address Data
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: Linearity Adjustment
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 2. Table Increasing Calibration Weight For Linearity Adjustment ( ) : Cumulative total of weights on the scale Model EW 220-3NM EW 420-3NM EW 620-3NM EW 820-3NM EG 220-3NM EG 420-3NM EG 620-3NM Display on = (0g) (0g) (0g) (0g)
- Page 22 ( ) : Cumulative total of weights on the scale Model EW 600-C3 NM EW 120-4 NM Display on 0 (0g) (0g) on 1 (30g) (30g) on 2 (60g) (60g) on 3 (90g) (90g) on 4 (120g) (120g) Calibration 20g x 4...
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Page 23: Calibration Of Built-In Weight (Ref Cal)
4.8 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 • It is necessary to adjust the linearity of the scale beforehand. Refer to 4-7. - 23 - EW_EW-C_EG_N-SH-e-0722... - Page 24 Cautions (1) [ ] must be carried out in following cases: When built-in weight is added or replaced. When linearity adjustment is done. When AJDP board is replaced. (2) The quality/tolerance of the reference weight determine the accuracy of the scale. Use weights of higher accuracy than the scale.
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Page 25: Parts Replacements
5 Parts Replacements 5.1 How to remove the case 5.1.1 EW 220-1200 (1) Unplug the AC adaptor. Remove the pan and pan base. Remove case fixing screw with a screwdriver. Locate two hooks beneath the scale near front. Pull those two hooks toward you to lift the case up, then shift the case to rear to release it from hooks. -
Page 26: Ew 2200-12K
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: Ew-C
5.1.3 EW-C (1) Unplug 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. -
Page 28: Ew 120-4 Nm
5.1.4 EW 120-4 NM - 28 - EW_EW-C_EG_N-SH-e-0722... -
Page 29: How To Cover The Case
5.2 How To Cover The Case 5.2.1 EW 120-1200 and EW-C (1) Cover the scale with the 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. -
Page 30: Sequence Of Mechanism Unit Replacement
5.3 Sequence Of Mechanism Unit Replacement - 30 - EW_EW-C_EG_N-SH-e-0722... -
Page 31: How To Remove The Weighing Mechanism Unit
5.3.1 How To Remove The Weighing Mechanism Unit 5.3.1.1 EW 120-1200 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 fixing screw. - Page 32 (5) Remove three mechanism unit screws. (6) Remove the mechanism 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.
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Page 33: How To Install Weighing Mechanism
(2) Solder wires of the Tuning-fork sensor to the AJDP circuit board. Cover the mechanism unite with the sensor cover. Fit it with four fixing screw. (EW 120-1200). Fix the Tuning-fork sensor wire to hexagon pillar with cord band. (EW2200-12K) (4) Cover the scale referring to 5-2. -
Page 34: Plate Rib Replacement
5.4 Plate Rib Replacement - 34 - EW_EW-C_EG_N-SH-e-0722... -
Page 35: Plate Rib Replacement Procedure
5.4.1 Plate Rib Replacement Procedure (1) Remove the mechanism unit from the chassis. (5-3) (2) Replace the tuning-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 new one. -
Page 36: Sequence Of Tuning-Fork Sensor Replacement
5.5 Sequence Of Tuning-Fork Sensor Replacement 5.5.1 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 screws. (Need the torque 25kgfcm) - 36 - EW_EW-C_EG_N-SH-e-0722... -
Page 37: Sequence Of The Ajdp Circuit Board Replacement
5.6 Sequence Of The AJDP Circuit Board Replacement 5.6.1 How To Remove AJDP Circuit Board (1) Remove the case 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 AJDP board. -
Page 38: How To Install Ajdp Circuit Board
5.6.2 How To Install AJDP Circuit Board (1) Solder wires of 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) Cover the scale referring to 5-2. -
Page 39: How To Remove Calibration Weight Unit
5.7 How To Remove Calibration Weight Unit 5.7.1 EG 220-620 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 Remove SW cord assy from AJDP circuit board Remove the weight holder - 39 -... - Page 40 Weight Holder Remove the side ring and disassemble the weight Weight Fixing Screw Side Ring Remove the weight shaft from the mechanical main unit Weight Shaft - 40 - EW_EW-C_EG_N-SH-e-0722...
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Page 41: How To Install Calibration Weight Unit
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: Installation Options
6 Installation Options 6.1 Installation Of Battery Option 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 on the rear panel. -
Page 43: Ew 2200-12K
6.1.2 EW 2200-12K (1) Remove the case referring to 5-1. (2) Plug AJ battery cord to 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. -
Page 44: Parts List
7 Parts List 7.1 EW 220-1200 EW 820/-1200 EW 220/-420/-620 EG 220/-420/-620 EG 220/-420/-620 - 44 - EW_EW-C_EG_N-SH-e-0722... -
Page 45: Ew 2200-12K
7.2 EW 2200-12K - 45 - EW_EW-C_EG_N-SH-e-0722... -
Page 46: Ew-C / Ew 120-4 Nm
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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