Kern PES, PEJ Service Manual
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Service manual
Precision balance
KERN PEJ/PES
Version 1.1
4/2009
GB
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
PEJ/PES-SH-e-0911
GB
KERN PEJ/PES
Version 1.1 4/2009
Service manual
Contents
1. Basic information................................................................................................. 3
2. Total View............................................................................................................ 4
3. Electronic Construction........................................................................................ 5
3.1 Block Diagram.............................................................................................. 5
3.2 Whole Wiring................................................................................................ 6
4. Troubleshooting................................................................................................... 7
4.1 Troubleshooting Procedure .......................................................................... 7
4.2 Troubleshooting Table.................................................................................. 8
4.3 Troubleshooting Table 2............................................................................... 9
4.4 Primary Checks.......................................................................................... 10
4.5 Checks for Electric/Electronic Parts ........................................................... 11
4.5.1 Check of VIBA-2A board ..................................................................... 13
5. Adjustment and Setting ..................................................................................... 14
5.1 Span Calibration (Adjustment with internal weight – PEJ).......................... 14
5.2 Span Calibration (Adjustment with external weight – PES) ........................ 15
5.3 Corner Error Adjustment ............................................................................ 16
5.4 Linearity Adjustment................................................................................... 17
5.4.1 Table Increasing Calibration Weight for Linearity Adjustment............. 18
5.5 Calibration of Built-In Weight (Ref Cal) – only PEJ..................................... 19
6. Parts Replacement............................................................................................ 20
6.1 How to Remove the Case .......................................................................... 20
6.2 How to Cover the Case .............................................................................. 20
6.3 How to Replace Mechanical Unit ............................................................... 21
6.4 How to Remove Mechanical Unit ............................................................... 21
6.5 How to Install Mechanical Unit ................................................................... 22
6.6 Sequence of Tuning-Fork Sensor Replacement ........................................ 23
6.7 How to Remove Tuning-Fork Assy............................................................. 23
6.8 How to Install Tuning-Fork Assy................................................................. 24
6.9 Adjustment of Overload Stopper ................................................................ 25
6.10 Sequence of Circuit Board Replacement ................................................... 26
7. Installation of Options........................................................................................ 27
7.1 Installation of Battery Option ...................................................................... 27
7.2 Installation of Relay Contact Option ........................................................... 28
8. Parts List ........................................................................................................... 30
8.1 Explosion Diagram ..................................................................................... 30
8.2 Bill of Material............................................................................................. 31
8.3 View of Components PES 31000-1M ......................................................... 32
Precision balance
2 PEJ/PES-SH-e-0911
1. Basic information
Grundlegende Hinweise
The device must be repaired only by trained specialist staff or personnel with
professional 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 violation 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.
PEJ/PES-SH-e-0911 3
2. Total View
4 PEJ/PES-SH-e-0911
3. Electronic Construction
3.1 Block Diagram .1 Block Diagram
Calibration Weight Unit
(PEJ only)
PRINT
BT
LEFT
PEJ/PES-SH-e-0911 5
3.2 Whole Wiring
Calibration Weight Unit
(PEJ only)
PRINT LEFT
6 PEJ/PES-SH-e-0911
4. Troubleshooting
4.1 Troubleshooting Procedure
LF Board
is normal
Board
DP (N) Board
LF Board
LF Board
PEJ/PES-SH-e-0911 7
4.2 Troubleshooting Table
SYMPTOMS CAUSES & REMEDY
No display lights on 1. DP board is defective.
2. AC adaptor is defective.
3. Wrong connection of connection cords inside.
4. Built-in battery is discharged.
‘u-Err’ or ‘o-Err’ appears self
test of segment.
Display does not get settled
down.
Display does not repeat
correctly.
Zero points drifts.
‘o-Err’ appears with a net
load less than specified
capacity.
Span is out of specified
range.
Linearity is out of specified
range.
1. Wrong weighing pan is applied.
2. Tuning-fork sensor or mechanism unit is
defective.
3. DP board is defective.
4. Setting of address date has mistake.
5. Coefficient memories (address data) have
changed by noise or static electricity. Adjust
linearity.
1. Some parts such as stopper touch others.
2. Internal calibration weight touches other parts.
3. Weighing pan touches other parts.
4. Foreign substances are in the scale.
5. Tuning-fork sensor or mechanism unit is
defective.
6. Affected by wind or disturbing oscillation.
Check environment or working base. Check
also setting of stabilization time.
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 noises or static electricity. Adjust
linearity.
4. Wrong external calibration weight is used in
span calibration.
5. Internal calibration weight touches other parts.
1. Tuning-fork sensor or mechanism unit is
defective.
2. DP board is defective.
3. Setting of address data has mistake.
4. Coefficient memories (address data) have
changed by noises or static electricity. Adjust
linearity.
1. Tuning-fork or mechanism unit is defective.
2. Setting of address data has mistake.
3. Coefficient memories (address data) have
changed by noises or static electricity. Adjust
linearity.
4. Wrong external calibration weight is used in
span calibration.
8 PEJ/PES-SH-e-0911
4.3 Troubleshooting Table 2
SYMPTOMS CAUSES & REMEDY
- Corner error is too much. 1. Mechanical unit is defective, such as roberval
plate (spring) has been bent or twisted.
2. Pan base touches other parts.
- Display suddenly
disappeared
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
- appears.
1. DP board is defective.
2. AC adaptor is defective.
1. Wrong external calibration weight is used in
span calibration. (External weight is less than
50% of capacity).
1. Span error exceeds 1% of capacity in span
calibration (check the external weight).
2. Tuning-fork sensor or mechanical unit is
defective.
Something is loaded on the pan in automatic span
calibration (remove the things from the pan).
1. Span error exceeds 1% of capacity in
automatic span calibration.
2. Tuning-fork sensor or mechanical unit is
defective.
Interval time is not properly set.
Automatic span calibration stops due to battery
consumption.
The weight error exceeds +/- 100.00mg. Re-set the
weight error within +/- 100.00mg.
Coefficient memories (address data) have changed.
Reset the data.
Internal clock function is defective. Check internal
clock and replace DP board, if necessary.
Coefficient memories (address data) have changed.
Check the address data and reset it, if necessary.
The weight of sample is too light (counting mode and
% mode).
Counting function is not properly operated.
PEJ/PES-SH-e-0911 9
4.4 Primary Checks
1. Is any wind around the site?
Is any oscillation? Is the working table stable?
2. Is anything under the pan base or the weighing pan?
3. Is the weighing pan the right one?
4. Is AC adaptor connected both with the scale and with the scale and with the
outlet properly?
5. Is battery option charged sufficiently?
10 PEJ/PES-SH-e-0911
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