KERN TACJ User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Service manual
Analytical balance
KERN TACJ/TACS
Version 1.2
2019-12
GB
TACJ/TACS-SH-e-1912

2 TACJ/TACS-SH-e-1912
GB
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.
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 viola-
tion 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 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 dürfen nur Originalersatzteile verwendet werden.
Hinweis zu konformitätsbewerteten Waagen:
Reparatur darf nur in 100% -iger Übereinstimmung mit der Bauartzulassung erfolgen.
Ein Verstoß gegen diese Vorgabe führt zum Erlöschen der Bauartzulassung!
Nach erfolgreicher Reparatur muss eine Nacheichung erfolgen, um die Waage wieder
im gesetzlich geregelten Bereich verwenden zu können.

TACJ/TACS-SH-e-1912 3
Table of Contents
1Operations for Adjus tment ................................................................................5
1.1 Entering the Service Mode ............................................................................................................5
1.2 Contents of Service Menu .............................................................................................................6
1.3 Service Mode Functions................................................................................................................7
2Disass embling and As s embling the B alance.................................................10
2.1 Precautions.................................................................................................................................. 10
2.2 Inspecting the Balance Interior (Removing the Case and Pan Supporter) ........................... 12
2.3 Replacing Components .............................................................................................................. 15
2.3.1 Replacing the Front Glass ASSY (C8).......................................................................................... 15
2.3.2 Replacing the Side Glass ASSY (C6, C7)..................................................................................... 16
2.3.3 Replacing the Roof Glass ASSY (C5)........................................................................................... 16
2.3.4 Replacing the Display Board ASSY (B2)....................................................................................... 16
2.3.5 Replacing the Power Board ASSY (B4)........................................................................................ 17
2.3.6 Replacing the Analog Board ASSY (B3)....................................................................................... 18
2.3.7 Replacing the Weight Loader ASSY (27)...................................................................................... 19
2.3.8 Replacing the Unit ASSY (1)......................................................................................................... 20
2.3.9 Replacing the Detector ASSY (U11) ............................................................................................. 21
2.3.10 Replacing the Force Coil ASSY (L1)......................................................................................... 22
2.3.11 Replacing the Stopper Plate (U14) ........................................................................................... 25
2.3.12 Replacing the Stopper Lever (U15) .......................................................................................... 25
3Checking the E lectronic B oard........................................................................27
3.1 Display Board ASSY (B2) ........................................................................................................... 27
3.2 Analog Board ASSY (B3)............................................................................................................ 28
3.3 Preamp Board ASSY (B1)........................................................................................................... 28
3.4 Power Board ASSY (B4).............................................................................................................. 29
4Hardware Adjustment.......................................................................................30
4.1 Adjusting the Detector ASSY (U11) Height............................................................................... 30
4.2 Adjusting the Tilt Error ............................................................................................................... 31
4.3 Adjusting the Balance................................................................................................................. 32
4.4 Adjusting the Cornerload Error ................................................................................................. 33
5S oftware Adjus tment........................................................................................35
5.1 EEPROM Initialization................................................................................................................. 35
5.2 Model Selection........................................................................................................................... 36
5.3 Releasing and Setting the Setting Information Lock............................................................... 36
5.3.1 Releasing the Setting Information Lock......................................................................................... 37
5.3.2 Setting the Setting Information Lock ............................................................................................. 37
5.4 Inputting Weight Values for Linearity Adjustment................................................................... 38
5.5 Linearity Adjustment................................................................................................................... 38
5.6 Internal Weight Calibration (PCAL) (ACJ Only)........................................................................ 39
5.6.1 Operation Procedure and Process................................................................................................ 39
5.7 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
5.8 Weight Loader Mechanism Operation Check........................................................................... 45
5.8.1 Operation Procedure and Process................................................................................................ 46
5.8.2 Errors............................................................................................................................................. 46
6EEPROM............................................................................................................47
6.1 PRINT Operations........................................................................................................................ 47
6.2 Data Edit (EDIT) Operations ....................................................................................................... 48
6.3 Backup (BKUP) Operations........................................................................................................ 48

4 TACJ/TACS-SH-e-1912
6.4 Download (RESTR) Operations.................................................................................................. 49
6.5 All Initialization (INIT) Operations.............................................................................................. 49
7Performance Inspection .................................................................................. 50
7.1 Reproducibility............................................................................................................................. 50
7.2 Cornerload Error.......................................................................................................................... 50
7.3 Linearity........................................................................................................................................ 51
7.4 Tilt Error........................................................................................................................................ 51
8Problems and S olutions .................................................................................. 53
8.1 General Problem Solutions ........................................................................................................ 53
8.2 Error Display ................................................................................................................................ 55
8.2.1 User Mode Errors .......................................................................................................................... 55
8.2.2 Service Mode Errors...................................................................................................................... 56
9Troubleshooting............................................................................................... 57
9.1 Display Won't Appear.................................................................................................................. 57
9.2 Key Operation Does Not Work................................................................................................... 57
9.3 “ERR C” is Displayed.................................................................................................................. 58
9.4 “ERR H” Is Displayed.................................................................................................................. 60
9.5 When Power Is Switched On, Display Stops at “Software Version”...................................... 60
9.6 Trouble of Weight Loader........................................................................................................... 61

TACJ/TACS-SH-e-1912 5
1 Operations for Adjustment
For the general operations method, see the User's Manual for the ACJ/ACS Series.
1.1 Entering the Service Mode
Series ACS:
Move from user mode to service mode as follows.
1. In the user mode mass display state, keep pressing [ON/OFF] and [PRINT] keys
together for aprox. 3 seconds.
2. Release the keys
3. Press down on the [CAL] and [MENU] keys together for approx 3 seconds.
4. The password input display appears.
5. Use the arrow keys to input numbers.
6. Input 00321 as the display maintenance mode password, and press the [TARE]
key.
7. When the password is approved, the service mode opens.
Alternately, you can enter service mode by inputting the display maintenance mode
command "@SVC=321" from the PC.
Series ACJ:
1. Break the seal on base (left side). By pressing the sealing switch on the display
board (a push button on the left from your view of the board), connect the AC
adapter and when “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).

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

TACJ/TACS-SH-e-1912 7
Items in the figure framed in thick lines denote execution items, while those framed in
thin lines denote menu items.
Shaded items are not displayed when the setting information lock is on. Use the arrow
keys to move between items.
Key
Explanation
→
(Print)
Move to an item in a subordinate menu. If the menu item to the left of
the arrow has no asterisk mark and is also shaded, pressing the [Enter]
key on that item opens a subordinate menu item. (In other words, if the
higher menu accepts the [Enter] key even if it has no enable/disable
switch, pressing the [Enter] key opens the subordinate menu.) To open
the menu from the mass display state, use the [MENU] key instead of
the [→] key.
ESC (ON/OFF)
Return to the item in the higher menu.
↓
(MENU)
Move to the items in order.
↑
(UNIT)
Move to the items in revers order.
1.3 Service Mode Functions
Function
Outline
Error display
Error display Displays error codes for errors
that have occurred in user mode.
If no errors have occurred when service mode
is opened, the error display does not appear.
Model name display
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

8 TACJ/TACS-SH-e-1912
Function
Outline
Software Ver. display
Displays the currently mounted software ver-
sion.
Ex.: 1.00, ##, XX
In principle, 1.00 is the version number for
hardware changes.
Next, ## is the version number for manuals
and other documentation changes.
Finally, XX is the version number for bug fixes
and other minor changes.
Span temperature coefficient display
Displays the span temperature coefficient for
before and after aging.
Zero drift display
Displays the amount of zero drift before and af-
ter aging.
AD value display
Mass data (WAD) dis-
play
Displays mass data as received from AD con-
verter. (Data subjected to smoothing)
Temperature data
(TAD) display
Digitally displays voltage of temperature sensor
mounted
Temperature-corrected
mass
Displays WAD mass data subjected to temper-
ature correction. (Data subjected to smoothing)
Linear-corrected mass
data
Displays OAD mass data subjected to linearity
correction.
Absolute load(WG)
display
Displays mass values shown in g units that are
subjected to all correction processing. Displays
mass values not subjected to zero setting or
tare weight.
Sensitivity calibration
Executes sensitivity calibration using the same
operation
Weight loader
Return to initial position
Internal weight loader system returns to initial
position.
Load and unload
Internal weight is loaded or unloaded to unit
ASSY.
Linearity adjust-
ment
Linearity adjustment
Executes the adjustment operation for calcula-
tion of the linearity correction coefficient.
Weight value input for
linearity
Inputs the reference weight value used for line-
arity adjustment.

TACJ/TACS-SH-e-1912 9
Function
Outline
Model selection
Selection of the model name automatically sets
the basic information for weighing capacity,
minimum display, and reference mass for ad-
justment.
Shipping settings
Unit for Japan
Set the units users can use, depending on
shipping destination.
SI unit
Overseas unit
Unit for Asia
Type approval
Serial No. input
Top 5 digits
Input the top 5 digits of serial No.
Bottom 5 digits
Input the bottom 5 digits of serial No.
OEM
On
Sets to OEM model
Weighing capacity
Changes to weighing capacity
Minimum display
Changes to minimum capacity
Setting information lock (error check)
Prevents changes to the model, OEM, ship-
ping, and S/N settings. When the lock is active,
all error checks are enabled.
NVRAM
Data print
Outputs data saved in EEPROM to a dedicated
printer.
Data edit
Edits data saved in EEPROM on balance dis-
play unit.
Backup
Of the data saved in EEPROM, backs up tem-
perature correction coefficient, linearity correc-
tion coefficient, and model setting status data
to a Flash memory.
Download
Writes to EEPROM the data backed up on a
Flash memory.
All initialize
Initializes all data saved in EEPROM.
END
Ends service mode

10 TACJ/TACS-SH-e-1912
2 Disassembling and Assembling the Balance
2.1 Precautions
1. Pull the connector straight out when disconnecting. Never pull it out at a bent an-
gle.
*Pulling out at a bent angle could bend the terminal pins, making it difficult to re-
insert the connector.
Fig. 2-1
2. When assembling the base unit ASSY (2) and case ASSY (3), check that the
power board ASSY (B4) connector is firmly inserted.
*An insufficiently inserted connector could lead to instability in the display.
Connector
Fig. 2-2
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.