KERN TACJ Service Manual
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KERN TACJ Service Manual

Analytical balance
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Service manual
Analytical balance
KERN TACJ/TACS
Version 1.2
2019-12
GB
KERN & Sohn GmbH
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
TACJ/TACS-SH-e-1912

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Summary of Contents for KERN TACJ

  • Page 1 KERN & Sohn GmbH Ziegelei 1 Tel: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 E-Mail: info@kern-sohn.com Internet: www.kern-sohn.com Service manual Analytical balance KERN TACJ/TACS Version 1.2 2019-12 TACJ/TACS-SH-e-1912...
  • Page 2 KERN TACJ/TACS Version 1.2 2019-12 Service manual Analytical balance Basic information Grundlegende Hinweise The device must be repaired only by trained specialist staff or personnel with pro- fessional formation (such as a repair-specialist accredited by law concerning verification). The service manual is obligatory for repair work.

  • Page 3: Table Of Contents

    Operation Procedure and Process ....................39 Sensitivity Calibration ......................... 42 5.7.1 Menu settings „I.CAL“ / „E.CAL“ ....................42 5.7.2 Adjustment with external weight (KERN ACS) ................43 5.7.3 Adjustment with internal weight (KERN ACJ)................44 Weight Loader Mechanism Operation Check ................45 5.8.1 Operation Procedure and Process ....................
  • Page 4 Display Won't Appear ........................57 Key Operation Does Not Work ....................57 “ERR C” is Displayed ........................58 “ERR H” Is Displayed ........................60 When Power Is Switched On, Display Stops at “Software Version” ........60 Trouble of Weight Loader ......................61 TACJ/TACS-SH-e-1912...

  • Page 5: Operations For Adjustment

    “CHE 2” is displayed, release the switch. 2. After a short time the display appears “OFF”. Press the [ON/OFF] key once. Now you are in weighing mode. 3. Enter the Service Mode following the same procedure as with standard models ACS (see above). TACJ/TACS-SH-e-1912...

  • Page 6: Contents Of Service Menu

    1.2 Contents of Service Menu TACJ/TACS-SH-e-1912...

  • Page 7: Service Mode Functions

    Displays the model name setting. Destination display Displays the destination setting. Ex.: JPN = Japan SI = Countries and regions that recog- nize SI units only EXP = Overseas (excluding Southeast Asia) ASIA = Southeast Asia TA = Type Approval TACJ/TACS-SH-e-1912...
  • Page 8 Internal weight is loaded or unloaded to unit ASSY. Linearity adjust- Linearity adjustment Executes the adjustment operation for calcula- ment tion of the linearity correction coefficient. Weight value input for Inputs the reference weight value used for line- linearity arity adjustment. TACJ/TACS-SH-e-1912...
  • Page 9 Flash memory. Download Writes to EEPROM the data backed up on a Flash memory. All initialize Initializes all data saved in EEPROM. Ends service mode TACJ/TACS-SH-e-1912...

  • Page 10: Disassembling And Assembling The Balance

    3. When performing disassembly and assembly of the unit ASSY (1), insert the lever fixing pin (J1) into the lever fixing hole on the top of the OPF. *Lift up on the lever ASSY (1) to insert the pin. Proceed carefully to avoid scratching the * elastic support. TACJ/TACS-SH-e-1912...
  • Page 11 4. Use a controlled torque driver to tighten the screws to the torques shown in the table below. Screw Torque [kgf•cm] M2.5 M3 pan head M3 hexagonal socket head bolt M4 pan head M4 hexagonal socket head bolt M5 hexagonal socket head bolt TACJ/TACS-SH-e-1912...

  • Page 12: Inspecting The Balance Interior (Removing The Case And Pan Supporter)

    • When removing the screw covers (B24), be careful to avoid damag- ing the case (C1) and the screw covers (B24). Fig. 2-3 Fig. 2-4 4. Remove screw P3 M4 × 20 (2 screws) (B23) on the bottom and front of the bal- ance. Fig. 2-5 TACJ/TACS-SH-e-1912...
  • Page 13 *Mount the unit cover (B5) so that the cable is flat. At this time, be careful to avoid pinching the cable. * Check that there is no gap between the base ASSY (B1) and the unit cover (B5). Fig. 2-7 Fig. 2-8 TACJ/TACS-SH-e-1912...
  • Page 14 (11) → Screw P3 M2.5 × 6 (2 screws), Wind shield plate (12) → Screw P4 M3 × 6 (2 screws) Fig. 2-12 7. Set the pan (6), pan supporter ASSY (4), and wind shield ring (7). 8. Perform horizontal adjustment, and connect the AC adaptor. TACJ/TACS-SH-e-1912...

  • Page 15: Replacing Components

    (C13), (4 cushions). Fig. 2-13 7. Follow this procedure in reverse to mount the new front glass ASSY (C8). * Insert into the case roof (C3) groove so that the cushion adhesion side faces toward the front. Fig. 2-14 TACJ/TACS-SH-e-1912...

  • Page 16: Replacing The Side Glass Assy (C6, C7)

    (B8). For the front-to-back direction, align the display board ASSY (B2) to a pressed-forward position, and attach the screw P3 M3 × 8 (4 screws). TACJ/TACS-SH-e-1912...

  • Page 17: Replacing The Power Board Assy (B4)

    ASSY (B4). With the centers of the two connectors, and of the jig ACJ for board mounting (J7) holes, in aligned positions, adjust the board position so that it comes to the farthest outside position. Fig. 2-17 7. Mount the rear cover (13). TACJ/TACS-SH-e-1912...

  • Page 18: Replacing The Analog Board Assy (B3)

    * When removing, use caution to ensure that it does not come into contact with the lever ASSY (U7) and scratch the elastic support. Fig. 2-19 5. Loosen the clamp, E-20-3C (B10) mounted to the base unit ASSY (2), and re- move the wire. Fig. 2-20 TACJ/TACS-SH-e-1912...

  • Page 19: Replacing The Weight Loader Assy (27)

    * Be careful to avoid letting the weight loader mechanism come into con- tact with the lever. * When mounting, press the weight loader ASSY (27) forward for the mounting position. Fig. 2-21 TACJ/TACS-SH-e-1912...

  • Page 20: Replacing The Unit Assy (1)

    * Mount the weight loader ASSY (27) on cell width of the unit ASSY (1) in the balance left and right directions. * Be careful to avoid letting the weight loader mechanism come into con- tact with the lever. TACJ/TACS-SH-e-1912...

  • Page 21: Replacing The Detector Assy (U11)

    5. Use the above procedures 3) to 4) in reverse to mount the detector ASSY (U11). 6. Perform "4.1 Adjusting the Detector ASSY (U11) Height." 7. Use the above procedures 1) to 2) in reverse to restore the original state. TACJ/TACS-SH-e-1912...

  • Page 22: Replacing The Force Coil Assy (L1)

    ASSY (L1) to the lever ASSY (U7), and solder the twist cable (L7) to the force coil ASSY (L1) terminal plate. * When viewed from the lever ASSY (U7) mounting side, left: blue line, right: yellow line TACJ/TACS-SH-e-1912...
  • Page 23 * Always insert the tightening parts in the facing shown in Fig. 2-29. Fig. 2-28 Fig. 2-29 12. With the force coil ASSY (L1) height adjusted by the magnet spacer (J9), tighten the lever ASSY (U7). (35 kg—cm) Fig. 2-30 TACJ/TACS-SH-e-1912...
  • Page 24 ASSY (B1). 20. With the stopper plate (U14) in a position aligned to the center of the force coil ASSY (L1) pin, use the pan head screw M3 × 6 (2 screws) and flat washer M3 (2 locations) to tighten. TACJ/TACS-SH-e-1912...

  • Page 25: Replacing The Stopper Plate (U14)

    4. Extract the lever fixing pin (J1) from the unit ASSY (1) lever fixing hole. * Lift up on the lever ASSY (U7) to extract the pin. Proceed carefully to avoid scratching the elastic support. 5. Connect the AC adaptor to the balance, and energize it. TACJ/TACS-SH-e-1912...
  • Page 26 10. Remove the AC adaptor, and remove the tester terminals from the detector ASSY (U11). 11. Remove the cable ASSY jig (J10). 12. Use the above procedures 2) to 3) in reverse to restore the original state. 13. See 2.3.8 to restore the original state. TACJ/TACS-SH-e-1912...

  • Page 27: Checking The Electronic Board

    PID calculation Metric data Circuits Mounted calculation PWM gate array (16bit) PID calculation PWM Temperature correction EEPROM Connector (J6) for flash memory writing Main clock 20 MHz (CPU1), 64 MHz (CPU2) Motor driver for weight loader I/F DATA communication circuit TACJ/TACS-SH-e-1912...

  • Page 28: Analog Board Assy (B3)

    J1 (3) Power (about +12V) J1 (4) Power GND (0V) J1 (5) Power GND (0V)  J1 (6) Power (about +12V) J1 (7) Temperature sensor signal output (about 2 to 3.2 V)  (in environment of 5 to 35 °C) TACJ/TACS-SH-e-1912...

  • Page 29: Power Board Assy (B4)

     J3 (6) Power (about +12V) J3 (7) Power GND (0V) J3 (8) Power GND (0V)  J3 (9) Power (about -12V)  J3 (10) Power (about +5V)  J3 (11) Main power (about 11.5 V with AC adaptor) TACJ/TACS-SH-e-1912...

  • Page 30: Hardware Adjustment

    4. Extract the lever fixing pin (J1) from the unit ASSY (1) lever fixing hole. * Lift up on the lever ASSY (U7) to extract the pin. Proceed carefully to avoid scratching the elastic support. 5. Connect the AC adaptor to the balance, and energize it. TACJ/TACS-SH-e-1912...

  • Page 31: Adjusting The Tilt Error

    6. If the adjustment standard deviates by ±5 mg, insert the lever fixing pin (J1) into the lever fixing hole on the top of the unit ASSY (1) OPF, and loosen the nut M3 fixing the eccentric balance weight (U20) for the lever ASSY (U7) in place. TACJ/TACS-SH-e-1912...

  • Page 32: Adjusting The Balance

    6. If the wAd display is off from 6,000,000 to 7,000,000, insert the lever fixing pin (J1) into the lever fixing hole on the top of the unit ASSY (1) OPF, and loosen the nut M3 fixing the balance weight (U21) for the lever ASSY (U7) in place. TACJ/TACS-SH-e-1912...

  • Page 33: Adjusting The Cornerload Error

    6. Place the weight successively in adjustment positions L and R, and record the respective display values. 7. Place the adjustment weight (200 g) at adjustment position B on the adjustment pan, and press the TARE key to display "0 g." TACJ/TACS-SH-e-1912...
  • Page 34 * To prevent deformation of the edge surface, do not shave off 3 mm on both sides of the cell width (X X area in the Fig. 4-8). Fig. 4-8 10. Repeat steps 5 to 9, record the display values, and perform the above adjust- ment until reaching the adjustment standard. TACJ/TACS-SH-e-1912...

  • Page 35: Software Adjustment

    1) In the service menu, select [NVRAM] → [INIT (All Initialize)]. 2) The execution confirmation display [OK?] appears. 3) Press the [TARE] key to execute. 4) The initializing progress indicator appears. 5) When initialization is completed, return to the AD value display in the service menu. TACJ/TACS-SH-e-1912...

  • Page 36: Model Selection

    5.2 Model Selection Select the KERN standard model name. The operation procedure is as shown below. 1) In the service menu, press either the [MENU/↓] or [UNIT/↑] key, and then select [Model Selection] (TYPE). 2) Press the [TARE] key. [Menu display example for model selection] [Caution] If "TYPE"...

  • Page 37: Releasing The Setting Information Lock

    If the setting information is not locked, the calibration error check will not occur. Therefore, even if an unsuitable weight is used during calibration, or if an unsuitable calibration operation is performed, the sensitivity cali- bration coefficient is calculated without any conditions, resulting in prob- lems in the measurement data display. TACJ/TACS-SH-e-1912...

  • Page 38: Inputting Weight Values For Linearity Adjustment

    1) In the AD value display, press the [MENU] key several times to display "LIN- EAR," and then press the [TARE] key. 2) Press either the [MENU] or [UNIT] key to display "L. ADJUST," and then press the [TARE] key. 3) "START" is displayed. Press the [TARE] key. TACJ/TACS-SH-e-1912...

  • Page 39: Internal Weight Calibration (Pcal) (Acj Only)

    3) In weighing mode press and hold down the [CAL] key, with [UNIT] or [MENU] key call up the sensitivity calibration related menu to display “PCAL”, and press the [TARE] key. 4) The display appears P-0000 . Input the PCAL password P-9999 by using the arrow keys and press the [TARE] key once. TACJ/TACS-SH-e-1912...
  • Page 40 9) If the zero point mass value is stable, automatically measure the mass. 10) Drive the weight loader system, and place the internal weight in UniBloc. 11) Stop the weight loader system, and when the mass value is stable, automatically measure the mass. TACJ/TACS-SH-e-1912...
  • Page 41 13) Stop the weight loader system, and when the zero point mass is stable, measure the mass (Z int). 14) Attach an instrumental error to the internal weight, and re-store in NVRAM. 15) Automatic sensitivity calibration (ICAL) starts up next. 16) Calibration is completed when the display returns to mass display. TACJ/TACS-SH-e-1912...

  • Page 42: Sensitivity Calibration

    E.CAL: Adjustment with external weight  Confirm with TARE  Press ON/OFF repeatedly or 3 sec., the balance will re- turn into weighing mode The saved adjustment (I.CAL or E.CAL) can now directly be invoked via the CAL button. TACJ/TACS-SH-e-1912...

  • Page 43: Adjustment With External Weight (Kern Acs)

    5.7.2 Adjustment with external weight (KERN ACS) • If during the adjustment process within 60 s no operation is carried out, „ERR C“ will be displayed. Press ON/OFF a restart.  In weighing mode press CAL. The weight value of the recommended adjustment weight appears flashing.

  • Page 44: Adjustment With Internal Weight (Kern Acj)

    5.7.3 Adjustment with internal weight (KERN ACJ) With the internal adjustment weight, the weighing accuracy can be checked and re-ad- justed at any time. • Condition: Menu setting „I.CAL“. Adjustment may be interrupted with ON/OFF, „ABORT“ is displayed.  Press the CAL-button and adjustment will take place au- tomatically.

  • Page 45: Weight Loader Mechanism Operation Check

    The initial position returning of the ACJ internal weight loader mechanism and the weight loader action are checked. ACJ also has a function that enables adjustment and testing using an external weight loader system, which is also displayed as a menu item. TACJ/TACS-SH-e-1912...

  • Page 46: Operation Procedure And Process

    If the operation is not completed within the specified time, a timeout error occurs, and an error log is registered. When returning from the error display, press the [ON/OFF] key. Code Error Name Description S-ERR0 Weight loader error Weight loader mechanism did not complete action within the specified time. TACJ/TACS-SH-e-1912...

  • Page 47: Eeprom

    S/N : 0000000000 V NO : 1.00,00,00 0000 : 07AB 0002 : ACAB 0004 : 0041 0006 : 0E47 • • 3) When printing of all data is completed, return to the AD value display in the ser- vice menu. TACJ/TACS-SH-e-1912...

  • Page 48: Data Edit (Edit) Operations

    1) In the service menu, select [NVRAM] and then [BKUP (Backup)]. 2) The execution confirmation display "OK?" appears. 3) Press the [TARE] key. Data in EEPROM is backed up and saved to the micro- computer Flash memory. 4) The backup progress indicator appears. TACJ/TACS-SH-e-1912...

  • Page 49: Download (Restr) Operations

    1) In the service menu, select [NVRAM] and then [INIT (All Initialize)]. 2) The execution confirmation display "OK?" appears. 3) Press the [TARE] key to execute. 4) The initialization progress indicator appears. 5) When initialization is completed, return to the AD value display in the service menu. TACJ/TACS-SH-e-1912...

  • Page 50: Performance Inspection

    3) - (Average of two display values at position 1) 4) If the errors are minor, follow "4.4 Adjusting the Cornerload Error." *This adjustment is only effective for minor errors (within ±30 counts). If the error is larger, replace the unit ASSY (1). Fig.20 TACJ/TACS-SH-e-1912...

  • Page 51: Linearity

    2) Position a sheet with thickness of 1 mm at the base of the rear fixing feet, and register the display value after the display stabilizes. (B) (Error) = (B) - (A) 3) If the errors are large, follow "4.2 Adjusting the Tilt Error." TACJ/TACS-SH-e-1912...
  • Page 52 *1: When the display board ASSY has been replaced, mount the EEPROM that was in- cluded with the original display board ASSY. *2: If the unit ASSY has been replaced, mount the included EEPROM to the display board ASSY. TACJ/TACS-SH-e-1912...

  • Page 53: Problems And Solutions

    Replace the force coil ASSY fault (L1). 5) Damage to OPF (U1) Replace the unit ASSY (1). 6) Detector ASSY (U11) Replace the detector ASSY fault (U11). 7) Analog board ASSY (B3) Replace the analog board ASSY fault (B3). TACJ/TACS-SH-e-1912...
  • Page 54 Re-solder the temperature sen- sor to the detector ASSY (U11). 7) Damage to OPF (U1) Replace the unit ASSY (1). 8) Analog board ASSY (B3) Replace the analog board ASSY fault (B3). 9) Detector ASSY (U11) fault Replace the detector ASSY (U11). TACJ/TACS-SH-e-1912...

  • Page 55: Error Display

    Unidentifiable command code received Weight capacity exceeded - OL Measurement pan was removed. Battery Power voltage Lights up when voltage supplied to the microcomputer is at or be- Mark drop low the specified voltage. WAIT Wait for operation approval ABORT Abort TACJ/TACS-SH-e-1912...

  • Page 56: Service Mode Errors

    PCAL and measured weight span value exceeds 2 % of reference weight value. Span error (CAL E4) Difference between the set ref- erence weight value and meas- ured weight span value exceeds 2 % of the reference weight mass. TACJ/TACS-SH-e-1912...

  • Page 57: Troubleshooting

    Troubleshooting 9.1 Display Won't Appear 9.2 Key Operation Does Not Work TACJ/TACS-SH-e-1912...

  • Page 58: Err C" Is Displayed

    9.3 “ERR C” is Displayed TACJ/TACS-SH-e-1912...
  • Page 59 Flow Chart of CAL error TACJ/TACS-SH-e-1912...

  • Page 60: Err H" Is Displayed

    9.4 “ERR H” Is Displayed 9.5 When Power Is Switched On, Display Stops at “Software Version” TACJ/TACS-SH-e-1912...

  • Page 61: Trouble Of Weight Loader

    9.6 Trouble of Weight Loader TACJ/TACS-SH-e-1912...

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