Kern PES, PEJ Service Manual

KERN & Sohn GmbH

Ziegelei 1	Tel: +49-[0]7433- 9933-0
D-72336 Balingen	Fax: +49-[0]7433-9933-149
E-Mail: [e-mail]	Internet: www.kern-sohn.com

Service manual

Precision balance

KERN PEJ/PES

Version 1.1 4/2009

GB

PEJ/PES-SH-e-0911

GB	KERN PEJ/PES
	Version 1.1 4/2009
	Service manual
	Precision balance

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
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

Calibration Weight Unit

(PEJ only)

	BT
PRINT	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

LF Board

DP (N) 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	1.	Wrong weighing pan is applied.
test of segment.	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.
Display does not get settled	1.	Some parts such as stopper touch others.
down.	2.	Internal calibration weight touches other parts.
	3.	Weighing pan touches other parts.
Display does not repeat	4.	Foreign substances are in the scale.
correctly.	5.	Tuning-fork sensor or mechanism unit is
		defective.
Zero points drifts.	6.	Affected by wind or disturbing oscillation.
		Check environment or working base. Check
		also setting of stabilization time.
‘o-Err’ appears with a net	1.	Gross weight applied to the scale pan (net
load less than specified		weight + tare value) exceeds the scale
capacity.		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.
Span is out of specified	1.	Tuning-fork sensor or mechanism unit is
range.		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.
Linearity is out of specified	1.	Tuning-fork or mechanism unit is defective.
range.	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		1.	DP board is defective.
disappeared		2.	AC adaptor is defective.
-	appears.	1.	Wrong external calibration weight is used in
			span calibration. (External weight is less than
			50% of capacity).
-	appears.	1.	Span error exceeds 1% of capacity in span
			calibration (check the external weight).
		2.	Tuning-fork sensor or mechanical unit is
			defective.
-	appears.	Something is loaded on the pan in automatic span
		calibration (remove the things from the pan).
-	appears.	1.	Span error exceeds 1% of capacity in
			automatic span calibration.
		2.	Tuning-fork sensor or mechanical unit is
			defective.
-	appears.	Interval time is not properly set.
-	appears.	Automatic span calibration stops due to battery
		consumption.
		The weight error exceeds +/- 100.00mg. Re-set the
		weight error within +/- 100.00mg.
-	appears.	Coefficient memories (address data) have changed.
		Reset the data.
-	appears.	Internal clock function is defective. Check internal
		clock and replace DP board, if necessary.
-	appears.	Coefficient memories (address data) have changed.
		Check the address data and reset it, if necessary.
-	appears.	The weight of sample is too light (counting mode and
		% mode).
-	appears.	Counting function is not properly operated.

PEJ/PES-SH-e-0911

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4.4Primary 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