KERN MBC-(E) User manual

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 scale
KERN MBC-(E)
Typ MBC 15K2DNM (DEM)
Typ MBC 20K10NM (EM)
Version 1.1
02/2020
GB
MBC-NM-SH-e-2011
Importør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
[email protected]
Tel.: [phone]

2 MBC-NM-SH-e-2011
GB
KERN MBC
Version 1.1 02/2020
Servicemanual
Contents
1Basic Information........................................................................................... 3
2Introdution...................................................................................................... 3
3Appliance overview ....................................................................................... 4
3.1 Overview of display .................................................................................................................... 5
3.2 Keyboard overview..................................................................................................................... 6
4Levelling ......................................................................................................... 7
4.1 Rechargeable battery operation (MBC-A08).............................................................................. 7
4.2 Battery operation........................................................................................................................ 8
4.3 Insert batteries............................................................................................................................ 8
4.4 Mains connection........................................................................................................................ 9
4.5 Initial Commissioning.................................................................................................................. 9
5Menu ............................................................................................................. 10
5.1 Navigation in the menu............................................................................................................. 10
5.2 Menu overview ......................................................................................................................... 11
6Position adjustment switch and seals:...................................................... 13
7Adjustment................................................................................................... 14
7.1 Procedure:................................................................................................................................ 15
8MAINTENANCE ............................................................................................ 17
8.1 General..................................................................................................................................... 17
8.2 Error Codes .............................................................................................................................. 17
8.3 Determine the Problem............................................................................................................. 17
8.4 Check the Load cell.................................................................................................................. 17
8.5 Load Cell Connections ............................................................................................................. 18
8.6 Checking the different Voltages ............................................................................................... 18
8.7 Trouble Shooting ...................................................................................................................... 19
9DRAWING ..................................................................................................... 20
9.1 MBC HM................................................................................................................................... 20
9.2 MBC oHM................................................................................................................................. 21

MBC-NM-SH-e-2011 3
1 Basic Information
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.
The operation and configuration of each scale is described in the accompanying manual of
the scale. Any safety information in respect for verification are also described in the
accompanying manual
2 Introdution
This service manual covers the MBC-NM series and is edited for the authorized servicing
personnel.
Note all rights are reserved. Copying any part of this manual is prohibited without our
permission.

4 MBC-NM-SH-e-2011
3 Appliance overview
1. Height measuring rod (optional)
2. Bubble level
3. Display Unit
4. LED
5. Baby weighing pan
6. Weighing pan
7. Rubber feet (height adjustable)
8. Mains connection
9. Battery compartment
10. RS232

MBC-NM-SH-e-2011 5
3.1 Overview of display
Display
Description
Description
GROSS
Gross weight display
Lights up during indication of the gross
weight of the baby (after drinking)
NET
Net weight display
Lights up during indication of the net weight
of the baby (before drinking)
Illuminated after weighing scale was tared
ZERO
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.
STABLE
Stability display
Scales are in a steady state
DRINK
DRINK function
Is displayed with active drink function
HOLD
HOLD function
Is displayed with active hold function
Rechargeable battery
symbol
Lights when the voltage drops below the
prescribed minimum.
Lights when the rechargeable battery
capacity is almost exhausted.
Lights when the rechargeable battery is fully
charged.

6 MBC-NM-SH-e-2011
3.2 Keyboard overview
Typ MBC 15K2DNM
Typ MBC 20K10NM
Key
Description
Function
ON/OFF-switch
Turn on/off
Zeroing key
Weighing scale will be reset to „0.0“ kg.
For numeric entry:
Change decimal place
HOLD button
Hold function
TARE button
Tare balance
Feeding Function
key
Differential weighing before and after the baby drinks
The net weight of the baby will be shown:
Before drinking
In menu:
Call up menu
How to select menu items
For numeric entry:
Edit numeric value
The gross weight is displayed:
After drinking
In menu:
Confirm selection
For numeric entry:
Confirm numerical value

MBC-NM-SH-e-2011 7
4 Levelling
Level balance with foot screws until the air bubble of the water
balance is in the prescribed circle.
4.1 Rechargeable battery operation (MBC-A08)
(is possible by obtaining an optional battery power pack)
Open the battery compartment cover (1) at the base of the display unit and insert the
rechargeable battery pack. Charge the battery for at least 12 hours before initial use.
The appearance of the symbol in the weight display indicates that the battery packs
is almost exhausted. The weighing scale will remain ready for operation for a few more
minutes before switching off in order to save battery. Load rechargeable battery.
Voltage has dropped below prescribed minimum.
Rechargeable battery very low.
Rechargeable battery completely reloaded
If the balance is not used for a longer time, take out the battery pack and store it separately.
Leaking liquid could damage the balance.

8 MBC-NM-SH-e-2011
4.2 Battery operation
As an alternative to rechargeable battery operation, the balance may also be operated with
6x AA batteries.
Open battery compartment cover (1) at the lower side of the display unit and insert batteries
according to the example below. Lock the battery cover again. If the batteries are empty, in
the balance display appears the symbol . Change batteries. To save battery power,
the balance switches off automatically (see Instruction manual MBC chap.11.6 Auto off).
Capacity of batteries exhausted.
Batteries will soon be flat.
Batteries are completely charged
4.3 Insert batteries
Remove battery compartment cover
Connect battery holder to housing contact
acc. to illustration
Insert battery holder
Insert batteries into battery compartment
and lock with battery compartment cover.

MBC-NM-SH-e-2011 9
4.4 Mains connection
Power is supplied by the external power unit which also serves to isolate the mains supply
from the scale. The stated voltage value must be the same as the local voltage.
Only approved genuine KERN power supply units may be used in compliance with Directive
EN 60601-1.
The small sticker attached to the side of the display unit indicates the power port:
The LED remains illuminated as long as the weighing scale remains connected to the mains.
The LED display provides information about the battery's charging status.
Green: battery is fully charged
Blue: battery is charging
4.5 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have reached
the operating temperature (see warming up time chap. During this warming up time the
balance must be connected to the power supply (mains, accumulator or battery) and be
switched on.
The accuracy of the balance depends on the local acceleration of gravity.
The value of gravity acceleration is shown on the type plate.

10 MBC-NM-SH-e-2011
5 Menu
Access to service menu „tCH“is locked in verified balances.
To disable the access lock, destroy the seal and actuate the
adjustment switch. For position of adjustment switch, see Instruction
manual MBC chap. 13.
Attention:
After destruction of the seal the weighing system must be re-verified
by an authorised agency and a new verification wire/seal mark fitted
before it can be reused for applications subject to verification.
5.1 Navigation in the menu
Call up menu
Turn on the scale during the self-test press , the first
function [F1 oFF] is displayed.
Select function
With help of , the individual functions can be selected one
after the other.
Change settings
Confirm selected function by . The current setting will be
displayed.
Select the desired setting with and press to confirm or
to reject, the balance returns to the menu.
Exit menu/
Return to weighing
mode
Press , the balance will return to weighing mode.