KERN MPE 250K100HNM User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Service Manual
Personal floor scale with BMI function
KERN MPE_HNM / MPE_PNM
Type MPE 250K100HNM
Type MPE 250K100PNM
Version 1.0
07/2018
GB
MPE_HNM / MPE_PNM -SH-e-1810

2 MPE_HNM / MPE_PNM -SH-e-1810
GB
KERN MPE_HNM / MPE_PNM
Version 1.0 07/2018
Servicemanual
Contents
1Basic Information........................................................................................... 3
2Appliance overview ....................................................................................... 4
3Keyboard overview........................................................................................ 6
4Overview of display....................................................................................... 7
4.1 Balance assembly and installation ............................................................................................. 7
4.2 Mains connection........................................................................................................................ 7
4.3 Battery operation is possible by obtaining an optional battery power pack. .............................. 8
4.4 Battery operation........................................................................................................................ 9
4.5 Insert batteries............................................................................................................................ 9
5The menu...................................................................................................... 10
5.1 Navigation in the menu............................................................................................................. 10
5.2 Menu overview ......................................................................................................................... 11
6Data output RS 232...................................................................................... 14
6.1 Pin allocation of balance output bushing:................................................................................. 14
6.2 Technical data .......................................................................................................................... 14
6.3 Position adjustment switch and seals:...................................................................................... 15
6.4 Verification validity period (current status in G)........................................................................ 15
7Adjustment................................................................................................... 16
7.1 Procedure:................................................................................................................................ 17
8MAINTENANCE ............................................................................................ 19
8.1 General..................................................................................................................................... 19
8.2 Error Codes .............................................................................................................................. 19
8.3 Determine the Problem............................................................................................................. 20
8.4 Check the Load cell.................................................................................................................. 21
8.5 Checking the different Voltages ............................................................................................... 21
8.6 Trouble Shooting ...................................................................................................................... 22
9Replace Main Board..................................................................................... 23
10 DRAWING ..................................................................................................... 24
10.1 MPE_HM .................................................................................................................................. 24

MPE_HNM / MPE_PNM -SH-e-1810 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
This service manual covers the MPE_HNM / MPE_PNM 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.
For operation, please use the operating instructions corresponding to the device

4 MPE_HNM / MPE_PNM -SH-e-1810
2 Appliance overview
1. Height measuring stick
(MPE-HM models only)
2. Display Unit
3. Weighing platform
(anti-slip surface)
4. Rubber feet
(height adjustable)
Underside
5.Rolls

MPE_HNM / MPE_PNM -SH-e-1810 5
Secondary display at rear
Display unit at rear
5 Rechargeable battery
compartment
6 Mains connection
7 RS 232 C

6 MPE_HNM / MPE_PNM -SH-e-1810
3 Keyboard overview
Type MPE 250K100HNM
Type MPE 250K100PNM
Key
Description
Function
ON/OFF-switch
Turn on/off
HOLD button
Hold function/Calculation of a stable weight value
BMI key
Calculation of the Body Mass Index
PRINT button
Data transfer via interface
In menu:
Confirm selection
For numeric entry:
Confirm numerical value
Function key
In menu:
Call up menu
How to select menu items
For numeric entry:
Increase numerical value
Zeroing key
Weighing scale will be reset to „0.0“
For numeric entry:
Change decimal place
TARE key
Tare balance

MPE_HNM / MPE_PNM -SH-e-1810 7
4 Overview of display
Display
Description
Description
Stability display
Scales are in a steady state
Zeroing display
Should the balance not display exactly
zero despite empty weighing plate, press
the button. Your balance will be set to
zero after a short standby time.
NET
Net weight display
Illuminated when net weight is displayed
Illuminated after weighing scale was tared
GROSS
Gross weight display
Illuminated when gross weight is displayed
HOLD
HOLD function
HOLD function active
BMI
BMI function
Illuminated while BMI function is enabled
4.1 Balance assembly and installation
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
Check levelling regularly.
4.2 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.
Always use genuine approved KERN power pack units as per EN 60601-1 directive.
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 informs you during loading about the loading status of the
rechargeable battery.
green:
Rechargeable battery is completely discharged
blue:
Charging rechargeable battery

8 MPE_HNM / MPE_PNM -SH-e-1810
4.3 Battery operation 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. Charge the battery for at least 12 hours before initial use.
The appearance of the symbol in the weight display indicates that the battery
is almost exhausted. The weighing scale will remain ready for operation for a few
more minutes before switching off in order to save battery (s. operating instructions
corresponding to the device chap. 11.6 Auto off).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 rechargeable battery and
store it separately. Leaking liquid could damage the balance.
1

MPE_HNM / MPE_PNM -SH-e-1810 9
4.4 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 operating instructions corresponding to the device chap.11.6 Auto off).
Capacity of batteries exhausted.
Batteries will soon be flat.
Batteries are completely charged
4.5 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.

10 MPE_HNM / MPE_PNM -SH-e-1810
5 The menu
Access to service menu „tCH“ is locked in verified weighing scales.
To disable the access lock, destroy the seal and actuate the
adjustment switch. For position of adjustment switch, see operating
instructions corresponding to the device chap. 16.
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
In weighing mode, press and the first function [F1
oFF] will be displayed.
Select function
With help of , the individual functions can be
selected one after the other.
Change settings
Confirm selected function by pressing .The current
setting will be displayed.
To select the desired setting, press and confirm
your selection by ; the weighing scale will return to
the menu.
Exit menu/
Return to weighing
mode
Press and the scales will return to weighing mode.