KERN MBB-M series Service Manual

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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

Baby weighing scale

KERN MBB-M (approval series)

Version 1.0 3/2010 GB

MBB-M-SH-e-1010

KERN MBB-M

Version 1.0 3/2010

Service manual

Baby weighing scale

Table of Contents

1 Basic Information .............................................................................................. 3

2 Technical Data ................................................................................................... 4

3 Overview of Display / Keyboard ....................................................................... 5

4 Error Message Indication .................................................................................. 6

5 Trouble Shooting ............................................................................................... 7

6 Calibration .......................................................................................................... 8

6.1 Calibration switch and seals ................................................................................. 8

6.2 Calibration procedure .......................................................................................... 10

7 Service Mode ................................................................................................... 12

7.1 Navigation in the menu ........................................................................................ 12

7.2 Description ............................................................................................................ 13

7.3 Setting of maximum capacity and resolution .................................................... 14

8 Approval Mode – Menu Overview .................................................................. 15

9 Schematics ...................................................................................................... 16

10 System Block Diagram .................................................................................... 20

11 Display Format ................................................................................................ 21

12 Layout ............................................................................................................... 22

13 Assembly Drawing .......................................................................................... 25

MBB-M-SH-e-1010

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.

MBB-M-SH-e-1010

2 Technical Data

KERN MBB 15K5M MBB 15K2DM

Weighing range (max) 15 kg 6 kg; 15 kg Minimum load (Min) 100 g 40 g Verification value (e) 5 g 2 g; 5 g Display LCD 24mm digit height

1.0 inch LCD with 5 and ½ digits

Recommended calibration weight, (class)

12 kg

(M1) Warm-up time 10 min Operating temperature + 5° C …. + 35° C Storage temperature - 20°C … + 60°C Humidity of air max. 80 % (not condensing)

Power Supply

Line adapter 15V / 300 mA ( EN60601-1)

Battery operation 6 x 1.5V, size AA Auto Off After 3 min without load change, adjustable Housing display unit

(B x D x H) mm

210 x 110 x 45

Weighing pan (WxD) mm 550 x 240 Calibrated in accordance

with 90/384/EEC

Medical grade III

Medical product in accordance with 93/42/EEC

Category I with measuring function

MBB-M-SH-e-1010

3 Overview of Display / Keyboard

Display view

Display Designation Description

Zeroing display Should the balance not display exactly zero

despite empty scale pan, press the

button. Your balance will be set to zero after a short standby time.

Stability display Scales are in a steady state

Power supply connected Illuminates in the event of power supply via

mains adaptor

HOLD function active Hold/Save function active

Net weight display Net weight will be displayed

Weight value display Current weight value will be displayed

MBB-M-SH-e-1010

Keyboard

Button Designation Function

ON/OFF-switch Turn on/off

Zero setting key Balance will be reset to 0.0 kg.

Possible up to max. 2% of maximum load for verified scales or 2 % or 100% of maximum load for all other scales (selectable via menu)

HOLD button Hold function/Calculation of a stable weight value

TARE button Tare balance

4 Error Message Indication

A. ErrE : EEprom Error B. ErrL : Low zero count C. Err : High zero count / Overload D. : Low battery indication

ooooo

: The scale plate was loaded during switching on the scale

MBB-M-SH-e-1010

5 Trouble Shooting

MBB-M-SH-e-1010

6 Calibration

6.1 Calibration switch and seals

After verification the display device is sealed at the indicated positions.

Verification of the balance is invalid without the "seal". Position of the official seals:

1. Rear of display device 2. Battery compartment

3. Bottom side of platform

MBB-M-SH-e-1010

Position of calibration switch:

Position of calibration switch Status

1. to the left

Test mode

Shows internal count, e.g. 100052 Zero count: 5000 ~ 200000 Span count: 10000 ~ 250000

Note: If the value of internal count is outside the reference value, please change the load cell or the main board.

2. concentric

Service mode

Calibration position – enables calibration

3. to the right

Approval mode

Verification position – calibration locked

1 2 3

Switch key

MBB-M-SH-e-1010

6.2 Calibration procedure

Observe stable environmental conditions. A warming up time of approx. 10 minutes is required for stabilization.

Attention: In calibrated balances the calibration function is switch locked. To carry out calibration, set the switch to calibration position (centre position). (See chpt. 6.1).

Display Operation

z000

Ö Start balance by pressing

OFF

SETUP

UNKT

Ö Press for approx. 3 sec, in the display appears „SETUP“, followed by „UNIT“

CAL

Ö Press

TARE

repeatedly until “CALIB“ appears

CAL U

Ö Press

HOLD

, „CAL U“ appears

Ö Press

TARE

, the appeared triangle W must be located in the

upper left part of the display. If it is not, press again

TARE

MBB-M-SH-e-1010

CAL U

CAL O

Ö Press

HOLD

repeatedly until “CAL 0“ appears.

30770

CAL O

Ö Press

TARE

the display will show a numeric value.

Ö Then press ,

“CAL 0“ appears.

CAL 5

Ö Press

HOLD

“CAL 5“ appears.

12.0

Ö Press

TARE

Enter the required size of the calibration weight. For this select the digit to be changed

with

HOLD

and the numeric value using

TARE

Ö Acknowledge by .

82077

Ö Place the calibration weight carefully in the centre of the

weighing pan and a numerical value will appear in the display.

Ö Press

HOLD

, the calibration process is started.

12.0

The balance will automatically return to weighing mode upon successful completion of the calibration and will display the weight of the calibration weight.

Take away calibration weight.

For verified scales, turn off the scales and move the calibration switch back to verification position.

MBB-M-SH-e-1010

7 Service Mode

The balance must be switched over to the service mode. To achieve this, set the calibration switch to calibration position (See chpt. 6.1).

In the service mode all parameters of the balance can be modified.

7.1 Navigation in the menu

 When the scale is switched on, press and hold the [→0←]-key for approx. 3

seconds until “SETUP“, followed by ”UNIT“ appears.

 Press the [ TARE ]-key repeatedly until the desired function appears.  Confirm the selected function by pressing the [HOLD]-key. The first parameter

appears. To select the desired parameter, use the [HOLD]-key and confirm by pressing the [TARE]-key.

To exit the menu and to store, press the [ TARE ]-key repeatedly until “END“ appears, then confirm by pressing the [HOLD]-key. The balance returns automatically into weighing mode.

A selection is made by pressing the [HOLD]-key and the [ TARE]-key

* *

* default setting

MBB-M-SH-e-1010

7.2 Description

Weighing unit: Kg Dividing steps (resolution) and weighing range (max) Selection multi-range scales / single range scales Single-range scales Multi-range scales Filter: Fast / normal / slow Auto Zero Tracking: 0.25d / 0.5d / 1d / 3d / OFF Stabilisation range: 0.25d / 0.5d / 1d / 3d / OFF Zero range: 2% / 100% Overload range: 9d / 2% Calibration Auto off: 120 sec / 180 sec / 240 sec / 300 sec / OFF Audible signal: ON/OFF Reset to default settings (default setup) Exit menu

MBB-M-SH-e-1010

7.3 Setting of maximum capacity and resolution

A selection is made by pressing the [HOLD]-key and the [ TARE]-key

Table 1- Dividing steps

NO. 500d 1000d 1500d 2000d 2500d 3000d 6000d

1 1.002 kg 1.001 kg 1.501 kg 1.0005 kg 1.2505 kg 1.5005 kg 1.2002 kg 2 2.505 kg 2.002 kg 3.002 kg 2.001 kg 2.501 kg 3.001 kg 3.0005 kg 3 5.01 kg 5.005 kg 7.505 kg 4.002 kg 5.002 kg 6.002 kg 6.001 kg 4 10.02 kg 10.01 kg 15.01 kg 10.005 kg 12.505 kg 15.005 kg 12.002 kg 5 25.05 kg 20.02 kg 30.02 kg 20.01 kg 25.01 kg 30.01 kg 30.005 kg 6 50.1 kg 50.05 kg 75.05 kg 40.02 kg 50.02 kg 60.02 kg 60.01 kg 7 100.2 kg 100.1 kg 150.1 kg 100.05 kg 125.05 kg 150.05 kg 120.02 kg 8 250.5 kg 200.2 kg 300.2 kg 200.1 kg 250.1 kg 300.1 kg 300.05 kg

9 501 kg 500.5 kg 750.5 kg 400.2 kg 500.2 kg 600.2 kg 600.1 kg 10 1002 kg 1001 kg 1501 kg 1000.5 kg 1250.5 kg 1500.5 kg 1200.2 kg 11 2505 kg 2002 kg 3002 kg 2001 kg 2501 kg 3001 kg 3000.5 kg 12 5010 kg 5005 kg 7505 kg 4002 kg 5002 kg 6002 kg 6001 kg 13 10020 kg 10010 kg 15010 kg 10005 kg 12505 kg 15005 kg 12002 kg

6.002

15.005

30.01

Maximum capacity

Dividing steps (resolution)

- standard 3000d -