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
Service manual
Platform balances
KERN EOE/EOS…N
Version 2.1
4/2009
GB
EOE, EOS…N-SH-e-0921
GB
KERN EOE, EOS…N
Version 2.1 4/2009
Service manual
Platform balances
2 EOE, EOS…N-SH-e-0921
Table of Contents
1 Basic Information........................................................................................................3
2 Features.......................................................................................................................4
3 Error Message Indication...........................................................................................4
4 Trouble Shooting........................................................................................................5
5 Calibration Procedure................................................................................................6
6 Inspection Mode for Technical Maintenance ...........................................................7
6.1 Zero Count and Span Count Adjustment............................................................................ 8
7 Functions Setting-up Sequence................................................................................9
8 Schematic of Main Board CH-0509..........................................................................10
9 Circuit Diagram for Adapter System.......................................................................11
9.1 CH-0521 (Inside EOE Platform).......................................................................................... 11
9.2 CH-0525 (Inside EOS Platform).......................................................................................... 12
10 System Block Diagram.........................................................................................13
11 Display Format......................................................................................................14
12 Layout....................................................................................................................15
12.1 Layout of Main Board CH-0509........................................................................................ 15
12.2 Layout of CH-0521 (Inside EOE Platform)....................................................................... 16
12.3 Layout of CH-0525 (Inside EOS…N Platform) ................................................................ 17
13 Explosion Diagram................................................................................................18
EOE, EOS…N-SH-e-0921 3
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.
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.
2 Features
1. Compact Dimension: 310 x 300 x 65 mm, 505 x 505 x 65, 945 x 505 x 65 mm,
900 x 550 x 65 mm
2. Material: Stainless Steel or Lacquered Steel
3. Overload Protection on Load Cell
4. Display options: 1.0 inch LCD display with 4 3/8 digital LCD
5. Capacity/Division: 6kgx5g, 15kgx10g, 35kgx20g, 60kgx50g, 150kgx100g,
300kgx200g
6. Power: AA 1.5VX6 batteries / 9V 100mA DC adapter
7. Power saving (auto shut-off timing selectable: 120 sec / 180 sec / 240 sec /
300 sec)
8. Operating Temperature: +10°C ~ +35°C
9. Operating Humidity: 25% ~ 80%
10. Function keys (4 key): ON/OFF, HOLD, UNIT, TARE
ON/OFF Switch the balance on or off by pressing the ON/OFF key.
HOLD Place the animal on the weighing platform and press the HOLD key to start
the animal weighing function (mean value).
A triangle will start to flash on the left hand side of the display, and during
this time the balance will record several values, then calculate and display
a mean value.
By pressing the HOLD key again, the weighing machine will be reset to
standard weighing mode.
Remark: With to lively movement (strong diplay fluctuation) no mean value
can take place.
UNIT Select weight unit kg lb
TARE By pressing the TARE key the display will appear “0”.
11. Weight units: kg/lb
12. Tare (to full capacity)
13. External Calibration (see chapter 5)
14. Functions setting-up (see chapter 7)
3 Error Message Indication
A. ErrE or ErrP : EEprom Error
B. ErrL : Low zero count
C. Err : Overload & High zero count
D. : Low battery indication
If scale shows any of the above error messages, it will auto shut-off after 30
seconds.
4 EOE, EOS…N-SH-e-0921
4 Trouble Shooting
EOE, EOS…N-SH-e-0921 5
5 Calibration Procedure
START
Press and hold
UNIT key for 6
seconds
Display shows
CAL
Display shows
LoAd
Load weight
(see Note 1.)
Press UNIT key once to confirm.
Display shows calibration weight.
END
Note 1:
Capacity Calibration
Weight
6kg 5kg
15kg 10kg
35kg 20kg
60kg 40kg
150kg 100kg
300kg 200kg
6 EOE, EOS…N-SH-e-0921
6 Inspection Mode for Technical Maintenance
START A
Press ON key without releasing, and Loading calibration weight
press UNIT key 3 times (see note 1)
Display shows zero count Display shows span count.
XXXX. Please see note 1 Please see Note 1 for span
for the zero count count range
Press TARE key Adjust RX1 value. Please see
note 1 for recommended RX1
value
EOE, EOS…N-SH-e-0921 7
Display show
0 Proceed calibration
procedure as per
chapter 5
A
Note 1:
Capacity Zero Count Span Count Calibration
Weight
Span Control
(RX1)
6kg 2000~12000 4000~8000 5kg 80K
15kg 2000~12000 4000~8000 10kg 62K
35kg 2000~12000 4000~8000 20kg 50K
60kg 2000~12000 3200~6400 40kg 25K
150kg 2000~12000 4000~8000 100kg 60K
300kg 2000~12000 4000~8000 200kg 30K
The total internal count is 32768. Overload was set at 32500 (in production).
<--------------------------------------32768 -------------------------------------------------------------------->
------
<----- ---------------------------32500 ------------------------------------------------------> Overload
<-2000~12000 (zero) + 4000~8000 (span)= 6000~20000 -> Safety range
6.1 Zero Count and Span Count Adjustment
If the ZERO COUNT value is out of range, adjust R1 or R2 on the main board.
If zero count is below 2000, use a variable resistor on R1 to adjust the zero count
(see note 1 chapter 6).
If zero count is above 12000, use
a
variable resistor on R2 to adjust the zero count
(see note 1 chapter 6).
After determination of the required resistor, solder it on the main board.
If the SPAN COUNT value is out of range, adjust RX1 on the main board.
Use a variable resistor on RX1 to adjust the span count
(see note 1 chapter 6).
After determination of the required resistor, solder it on the main board.
8 EOE, EOS…N-SH-e-0921
7 Functions Setting-up Sequence
EOE, EOS…N-SH-e-0921 9
Press and hold TARE for 6
seconds
Operating:
The Tare key is used for the rejection of a proffered option and has the same
meaning as “NO”
The [UNIT] key serves to select an available option and means the same as
„YES“
UNIT
TARE
TARE
UNIT
TARE
UNIT
TARE
TARE
TARE
UNIT
UNIT
TARE
TARE
8 Schematic of Main Board CH-0509
10 EOE, EOS…N-SH-e-0921
9 Circuit Diagram for Adapter System
9.1 CH-0521 (Inside EOE Platform)
EOE, EOS…N-SH-e-0921 11
9.2 CH-0525 (Inside EOS Platform)
12 EOE, EOS…N-SH-e-0921
10 System Block Diagram
EOE, EOS…N-SH-e-0921 13
11 Display Format
14 EOE, EOS…N-SH-e-0921
12 Layout
12.1 Layout of Main Board CH-0509
EOE, EOS…N-SH-e-0921 15
12.2 Layout of CH-0521 (Inside EOE Platform)
16 EOE, EOS…N-SH-e-0921
12.3 Layout of CH-0525 (Inside EOS…N Platform)
EOE, EOS…N-SH-e-0921 17
13 Explosion Diagram
1 Panel NP-xxxx
2 Lens LS-8045
3 Control Panel NP-8149
4 Screw SW-8060
5 Plastic Cover CR-8085
6 Bracket WP-8006
7 Screw M3x8
8 PCB Module CH-xxxx
9 Nut
10 Plastic Base BM-8055
11 Screw M3x8
12 Feet SW-0170
13 AC Jack LD-0201
14 Screw M2x5
15 Battery Box SN-36-1/6P
16 Battery Snap AE-013E
17 Strain Relief SB-5M-2
18 Foam 3x20x40mm
18 EOE, EOS…N-SH-e-0921
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