KERN KERN MBB-M series User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
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

MBB-M-SH-e-1010
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GB KERN MBB-M
Version 1.0 3/2010
Service manual
Baby weighing scale
Table of Contents
1Basic Information.............................................................................................. 3
2Technical Data................................................................................................... 4
3Overview of Display / Keyboard....................................................................... 5
4Error Message Indication.................................................................................. 6
5Trouble Shooting............................................................................................... 7
6Calibration.......................................................................................................... 8
6.1 Calibration switch and seals .................................................................................8
6.2 Calibration procedure ..........................................................................................10
7Service Mode ................................................................................................... 12
7.1 Navigation in the menu........................................................................................12
7.2 Description............................................................................................................13
7.3 Setting of maximum capacity and resolution....................................................14
8Approval Mode – Menu Overview .................................................................. 15
9Schematics ...................................................................................................... 16
10 System Block Diagram.................................................................................... 20
11 Display Format ................................................................................................ 21
12 Layout............................................................................................................... 22
13 Assembly Drawing .......................................................................................... 25

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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.

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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 calibra-
tion 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 accor-
dance with 93/42/EEC Category I with measuring function

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3 Overview of Display / Keyboard
Display view
Display Designation Description
1 0Zeroing display Should the balance not display exactly zero
despite empty scale pan, press the but-
ton. Your balance will be set to zero after a
short standby time.
2 Stability display Scales are in a steady state
3 Power supply connected Illuminates in the event of power supply via
mains adaptor
4
HOLD function active Hold/Save function active
5
Net weight display Net weight will be displayed
6
Weight value display Current weight value will be displayed

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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
E. ooooo : The scale plate was loaded during switching on the scale

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5 Trouble Shooting

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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

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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

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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 calibra-
tion, set the switch to calibration position (centre position). (See chpt. 6.1).
Display Operation
a
z000
ÖStart balance by pressing OFF
ON
SETUP
Ø
UNKT
ÖPress for approx. 3 sec,
in the display appears „SETUP“, followed by „UNIT“
CAL
K
B
ÖPress TARE repeatedly until “CALIB“ appears
CAL U
ÖPress HOLD , „CAL U“ appears
ÖPress TARE , the appeared triangle Wmust be located in the
upper left part of the display.
If it is not, press again TARE .

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CAL U
Ø
CAL O
ÖPress HOLD repeatedly until “CAL 0“ appears.
30770
Ø
CAL O
ÖPress TARE ,
the display will show a numeric value.
ÖThen press ,
“CAL 0“ appears.
CAL 5
ÖPress HOLD ,
“CAL 5“ appears.
12.0 ÖPress 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 .
0
ÖAcknowledge by .
82077
ÖPlace the calibration weight carefully in the centre of the
weighing pan and a numerical value will appear in the dis-
play.
ÖPress 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.

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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“ ap-
pears, 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

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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

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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 -

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8 Approval Mode – Menu Overview
Menu overview for calibrated scales (calibration switch in verification position)
When the scale is switched on, press and hold the [→0←]-key for about 3 seconds
until “SETUP“ followed by “A.OFF“ appears.
A parameter selection is made by pressing the [ TARE] -key and the [HOLD] -
key.
A.OFF = Auto off: 120 s / 180 s / 240 s / 300 s / OFF
bUrr = Audible signal: ON/OFF
End = Exiting the menu
When “End” is selected, press the [HOLD] -key to return to normal weighing
mode.
SETUP
A.OFF 120 180
OFF
240 300 OFF
BURR 0n
END

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9 Schematics
Main Board CH-0651

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Power Board CH-0723
Junction Board CH-0725

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10 System Block Diagram