Seca 664 User manual

for seca 664 / 665
Service Manual
6641321004
6641321104
6641321134
6641321364
6642521004
6642521104
6642521134
6657021004
6657021009
6657021094
6657021099
6657021194
6657021199
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6657521009
6657521094
6657521099
6657521194
6657521199
Electronic wheelchair scale, collabsible, vertical stand up and easily
manoeuvrable. Pre tara function with three adjustable values with chipcardreader.
Turnable display and operating housing.
Valid as of: 01.03.2011
Variants:
Content:
Description chipcard module 30-34-00-685
Description NEC I Elektronik 30-34-00-779
Description of faults 30-34-00-588 d
Function diagram 25-02-02-209 a
Calibration 30-34-00-603
PC configuration program 30-34-00-672 b
Cable plan 08-02-06-022 c
Description:
Service Manual Number
17-05-01-292-L
Cable plan chipcardreader
Replacement
Spare parts
08-02-06-025
30-34-00-673 d
30-34-00-669 k
Manual number: 17-05-01-292-L

30-34-00-685 05.02.2002
EE/Jensen
1
Brief Description of the Chip Card Module
Introduction
The chip card module belongs to the family of seca electronic modules and is used to write data to and
to read data from chip cards. It works together with the extended display module which contains the
operating functions for chip card handling.
The following block diagram shows the most important function blocks of the module:
µC
SeSAM Bus
reset-
circuit
crystal
oscillator
chipcard contact
signal transmitter
Chip card contact
Lowering contacts are used for the card allowing 200 000 insertion cycles. It can communicate with all
memory cards with an extended I²C bus which have been configured according to the memory
structure defined by seca.
Power supply
The required voltage of 3V is supplied via the SeSAM bus.
SeSAM bus
The SeSAM bus connects the module to the other modules. On this bus the stabilized and non-
stabilized supply voltages are available. All relevant data is exchanged via a data and a clock pulse
line. The scale can be switched on or the module can signal that it wishes to send data via a special
start line.
Signal transmitter
The chip card module is equipped with a signal transmitter. It can be activated via software if the
display module used does not have a signal transmitter. A piezo diaphragm is used which is controlled
with a 4 kHz square-wave signal.
Reset circuit
If the supply voltage is applied or the start key is pressed for longer than 10 seconds, a reset signal for
the micro controller is generated.
Fault handling
If faults occur, the SeSAM bus initiates a fault message with the relevant fault code. Furthermore, each
fault message includes the number of the module type on which the fault has occurred and a code
which indicates how long the message is to stay on display and which displays are to be suppressed.
The module type for the chip card module is 5.
The module can generate the following faults:

30-34-00-685 05.02.2002
EE/Jensen
2
30 General bus fault
32 Command buffer full
50 Rom checksum fault
52 Chip card not valid
100 Note, chip card saving
Time base
From the quartz’s 4.19MHz a time base is derived which controls all timed processes in the scale.
These are, for instance, various timeouts. If a clock module is connected, the seconds to the next full
minute are automatically counted up.
Data on the chip card
Default settings for the upper limit and the pre-tare function as well as the body height as the initial
value for the body mass index and the ideal weight can be stored on the card. Measured values for
subsequent evaluation at the PC can also be registered on the smart card.
Additionally, information about the chip card's owner can be stored on the card, which is required for
evaluation at the PC but is ignored by the scale.
Functions
The functionality of the chip card is programmed in the measured value detection module using an
EEPROM entry. This entry always takes effect if no other functionality is given by the chip card.
If you insert the chip card into the scale, the scale is started automatically. In addition, one of the menu
functions can immediately be displayed if required. The default setting retrieved from the card can be
edited in advance if required.
The chip card can also be used to restrict the functions of the scale to be used by the owner and it can
be determined which data can be saved at what time.
Technical data
Supply voltage: 3 V via SeSAM bus
Supply current: typ. 0.6mA
Zero-signal current: < 1µA
Operating temperature: approx. 0°C to 50°C
Storage temperature: -10°C to 60°C
Dimensions: 71mm x 60mm x 14mm

Service manual Electronics description
21.11.08 / EE/Jensen 30-34-00-779
1
Servicing seca electronic modules
seca electronic modules allow you to measure the signals of the weight sensor and to display the
weight values resulting from this. Depending on the design of the scale, both functions can be
combined on one module or distributed on different modules.
The configuration and adjustment data is stored on the module to which the weight sensor will be
connected. If this module is replaced, the replacement module must be configured and adjusted. This
is done using a PC configuration program called “serva”. Modules that only perform display functions
can simply be replaced.
When accumulator batteries are connected to the relevant connections, these batteries are charged
by the power supply unit with a 40 mA trickle charging current. Therefore make sure never to connect
batteries to the connections provided for accumulator batteries as the batteries would be destroyed by
the charging current and run out.
If, instead of the original seca power supply unit, a power supply unit is used that supplies an output
voltage of more than 12V, the electronics can be destroyed. Warning: There are many 12V power
supply units that supply more than 12V if there is no sufficient load on them. Therefore make sure only
to use original seca power supply units. If the electronics module was damaged as a result of a wrong
type of power supply unit being used, it must be replaced. Electronics that were damaged in this way
will usually draw so much current from the power supply unit that the power supply unit will cease to
function after a short while.
Identifying defective load cells
If you assume that a load cell may be defective, it is not always easy, especially on scales with four
load cells, to determine which of them is faulty.
In many cases a digital multimeter will help.
Unsolder the load cells you suspect to be faulty one after the other and measure the resistance
between the different connecting leads. On load cells that are typically used in scales with four load
cells the reading should be approx. 1200Ωbetween the supply connections, approx. 1000Ωbetween
the outputs and approx. 850Ωbetween a supply line and an output line. For platform load cells which
are typically fitted in scales with just one load cell, the readings should be approx. 1/3 of these values.
It is even easier to determine which load cell is defective if an oscilloscope is available. As grounding
contact you can use the grounding connection of the power supply unit, battery or accumulator
battery. Use the measuring head to measure the operational amplifier’s output signal at pin 7 of the 8-
leg IC with the number 2051 or 1112 printed on it. Make sure to pierce the paint with the test probe.
On the oscilloscope you should now see recurrent ramps starting from a 2.5V line, the height of which
depends on the load on the load cells. When you press on a load cell, the corresponding ramp
increases. If load cells are defective, this is usually easy to identify. Some distort the signal to such an
extent that the ramps no longer start at 2.5V. If you press on all cells in succession you will see which
cell responds as it should and which cell causes an incorrect signal.

Service manual Description of faults
21.11.08- Winterberg/Jen 1(2) 30-34-00-588 Index: d
Please refer to the operating instructions to make sure that scale malfunctions are not
caused by operation faults. Should any faults occur, the following table will help you to
identify the cause of the fault.
Fault description Possible cause Remedy
Scale does not start Battery not inserted
or flat
Check the batteries
Voltage supply
defective
Check the voltage at the relevant electronics connections, correct
the interruption
Bus connecting
cable defective
Check the plug-in connections, check the cable for interruptions,
replace if necessary
Keyboard defective
or not connected
Check the cable connections, check cable and keyboard for
interruptions, replace if necessary. (If possible please state the
number of the keyboard when ordering a replacement.)
Bus fault Disconnect power supply unit and battery from the scale, wait for 60
seconds, then reconnect.
Electronics
damaged by a
wrong type of power
supply unit
Replace the electronics. (Warning: The damaged electronics can
draw so much current that the power supply unit is also damaged.)
Scale repeatedly shows
no weight or an incorrect
weight
Packaging /
transport locking
device not removed
completey
Check the scale
Scale not correctly
adjusted
Recalibrate the scale
Sensor damaged Replace the sensor and readjust the scale
Lever system
damaged or load
transmission to
sensor interrupted
Check the base frame (and tie rod if present) for damage or incorrect
assembly
Scale remains in the
segment test or
measured values
fluctuate heavily
Short-circuit
between sensor
cable and housing
Look where the insulation is damaged (using a multimeter if
necessary) and repair it.
Display incomplete Display defective Replace the electronics
Scale does not respond
to keystrokes
Keyboard defective
or not connected
Check the cable connections, check cable and keyboard for
interruptions, replace if necessary. (If possible please state the
number of the keyboard when ordering a replacement.)
Faults occur during the
weighing operation
Display:
Er:x:no
Electronics detecting a fault.
X: Module number
No Fault number
Er:X:10 Sensor defective or
connected
incorrectly
Check the sensor and replace it if necessary (readjustment required
after replacement).
Er:X:11 Sensor defective,
supply lines
damaged or
electronics defective
Check supply lines, check sensor and replace as required
(readjustment required after replacement)
If several load cells are fitted, check the allocation (colour codes)
Replace the electronics
Er:X:12 Initial load too high Check the initial load
Check the load levers (jammed or bent), sensor damaged, replace
and readjust if necessary

Service manual Description of faults
21.11.08- Winterberg/Jen 2(2) 30-34-00-588 Index: d
Fault description Possible cause Remedy
Er:X:14 Fault in the kg value
calculation
Wrong coefficients in the module’s ROM, reprogram and readjust the
scale
Er:X:15 Recalibration fault Reference weight outside the permitted range or operating fault
Er:X:21 Fault in battery
voltage
measurement
Battery voltage much too low < 2.5 V or electronics defective
-> Replace the electronics
Er:X:22 Temperature
measurement error
Replace the electronics
Er:X:30 Data transmission
interrupted.
Check the bus connection, remove external sources of faults.
Er:X:32 Command buffer
overflow fault
Check the bus cabling, eliminate the EMC fault, de-energize the
electronics for a short instant (60 secs)
Er:X:33 To many modules
connected to bus
Reduce the number of modules connected to the bus.
Er:X:40 No data on
EEPROM / data
deleted
Readjust the scale or reload the scale adjustment data to the
EEPROM via the service interface
Er:X:41 Incorrect EEPROM
access
One of the modules connected accesses the memory in an incorrect
way. Determine the faulty module and replace it.
Er:X:50 Software checksum
not correct
Fault immediately after switch-on -> wrong checksum in the ROM
-> Replace the electronics
Er:X:51 Menu fault Fault when operating the menu functions (impermissible values or
similar)

Vogel & Halke
Created on: 30.06.1998
Holger Panier / SE
File: 00603_e1.doc
Printed on: 07.07.1999 seca
Page -1-
00603_e1.doc
Description of the calibration mode for scales with modularDescription of the calibration mode for scales with modular
electronicselectronics
General:General:
Seca scales with modular electronics are fitted with a software-controlled calibration device
that is operated using the existing controls. This device can be used to recalibrate the
scales or to set the scales to different GAL values. During development of the calibration
device, special attention was paid to the following requirements:
• It must be possible to recalibrate the scales without any additional external
equipment/tools.
• It must be possible to calibrate the calibration device.
• It must be possible to recalibrate the scales without calibrated test weights.
• The calibration device shall be protected against inadvertent use.
Calibration counterCalibration counter
The scales fitted with the new, modular electronics are equipped with a calibration counter
allowing a software recalibration to be carried out according to the requirements for
calibrated scales. To carry out such a recalibration, the calibration counter setting can be
called up on the display of the scales and compared to the data given on the calibration
label mark (applies only for calibrated products). If the values are identical, the scales are
calibrated; whereas differing values match the situation of a broken calibration seal. Each
completed recalibration procedure is registered by the calibration counter, i.e. the number is
automatically incremented by 1.
Recalibrating the scalesRecalibrating the scales
Before the scales can be recalibrated, they must be switched to the calibration mode:
To do so, switch on the scales using the appropriate control. While doing so, simultaneously
press another control key (for example, the kg/lbs key). This causes the contents of the
calibration counter (i.e. the number of calibration procedures carried out so far) to be
displayed for five seconds (flashing).
During the 5 seconds the contents is displayed, press the kg/lbs key again and keep it
depressed (for more than 1.5 seconds) to switch the scales to the calibration mode.
If the kg/lbs key is not pressed within these 5 seconds, the scales are automatically
switched back to normal weighing operation.
When switched to the calibration mode, the scales first are in a decrementing state. This
state is indicated by a flashing "dec" that alternates with the currently measured weight.
Now place a test weight onto the scales. This test weight should have a weight of at least
25% of the maximum permissible load for the weight (we recommend a weight of approx.
66-75%). The weight shown on the display must match the test weight; otherwise, the
scales are maladjusted and the recalibration procedure must carried out in full length. To do
so, change the weight shown on the display using the kg/lbs key until it matches the test
weight.
If the value shown on the display differs from the test weight (if not, recalibration is not
required), estimate whether the required nominal weight is easier to reach by decrementing
or by incrementing. To toggle from the decrementing mode to the incrementing mode or
vice versa, press the kg/lbs key for more than 1.5 seconds (display indicates dec or inc).

Vogel & Halke
Created on: 30.06.1998
Holger Panier / SE
File: 00603_e1.doc
Printed on: 07.07.1999 seca
Page -2-
00603_e1.doc
Pressing the kg/lbs key for less than 1.5 seconds causes the weight shown on the display
to be increased or decreased by 10 g (depending on the mode currently selected). As the
resolution of the display is lower, the displayed value will not necessarily be increased or
decreased each time the kg/lbs key is pressed. Repeat the above procedure until the
displayed weight and the test weight match. Set the scales to the middle between two
division values by additionally incrementing or decrementing the value by n=d/(2*10). The
calibration process can now be completed by pressing the kg/lbs key for at least five
seconds. The scales compute and store a new linearity coefficient and will then be switched
off automatically. The scales are now calibrated. Remove the test weight.
Note:
To prevent improper calibration by improper use, a timeout control has been implemented
in the calibration mode, i.e. the time that passes until the next key is pressed must never
exceed five seconds.
However, this timeout control is only active for the phase when switching to the calibration
mode.
If, during this phase, 5 seconds have passed and no key has been pressed, the scales are
automatically restored to the weighing mode so that the procedure must be repeated.
To reduce calibration errors to a minimum, recalibration is only possible using a test weight
of more than 25% and less than 100% of the max. load; otherwise, “Er:0:15” will appear
on the display.
If the scales need to be set to a different GAL value, the displayed value must be matched
to the test weight value adapted to the GAL value correction.
Example of a recalibration procedure:
The selected test weight is 100 kg.
The current weight shown on the display is 99.7 kg (max. difference of 300 g).
In this example, you must switch the scales to the incrementing mode to carry out the
recalibration procedure. After the kg/lbs key has been pressed (for more than 1.5 seconds),
a flashing "inc" is shown.
Now increase the value by the first 10 g (by briefly pressing the kg/lbs key). After this has
been done thirty times, the value 100.0 (rounded!) appears on the display although the
internal measured value still is 99.95 kg (not rounded!).
To correct this rounding error, increase the value by another 10 g to get exactly 100.00 as
the calculated value.
Terminate the recalibration procedure as described above.

Vogel & Halke
Created on: 30.06.1998
Holger Panier / SE
File: 00603_e1.doc
Printed on: 07.07.1999 seca
Page -3-
00603_e1.doc
Summary of a typical recalibration sequence:Summary of a typical recalibration sequence:
Action carried out by the user Result
The scales are switched off. No values or characters on the display.
Press the kg/lbs key and keep it depressed
while simultaneously pressing the start key. The contents of the calibration counter is shown on the display for 5 seconds
(flashing).
Release both keys. The contents of the calibration counter is
shown on the display for 5 seconds
(flashing).
Press the kg/lbs key for more than
1.5 seconds within the next 5 seconds. The system switches to the calibration mode: first "dec" appears on the display (flashing)
and then the current weight (0.0 - also
flashing).
5 seconds have passed and no key has
been pressed. The scales are switched back to normal weighing operation.
Place the test weight onto the scales. The measured weight of the test weight
appears on the display (flashing).
Decide whether to decrement or to
increment:
Incrementing:
Press the kg/lbs key for more than 1.5
seconds.
Decrementing:
No action required as the scales are already
in the dec mode.
The incrementing mode is activated; "inc"
appears on the display.
No output on the display.
Decrementing or incrementing:
Again briefly press the kg/lbs key (for less
than 1.5 seconds).
The measured weight is decreased or
increased by 10 g. Please remember that
pressing the key does not always change the
value on the display due to the low display
resolution. Only the rounded value is given.
Repeat this step until the measured weight
matches the test weight (format: xx.0 kg). The display indicates the test weight (format: xx.0 kg).
To correct this rounding error, decrement or
increment the value five times by another
10 g.
The display output does not change the first
four times.
After the fifth time the value has been
decremented or incremented, the measured
weight appears; it now matches the test
weight.
The display indicates the exact test weight
(format: xx.00 kg).
Press the kg/lbs key for at least 5 seconds
until the system is switched off. The display does not show any characters or values any more.

seca page 1(2) PC configuration program
17.06.03-Wint/Rei 30-34-00-672 b
Instructions for PC-based configuration
PC-based configuration is used for diagnosis or recalibration of all seca scales with modular electronics.
The following equipment is required:
•PC with serial interface (RS -232)
•seca software 'SERVA” 10-02-01-004
•RS232 service set 68-60-00-002,
consisting of:
•RS-232-service module 68-60-00-003
•Connecting cable PC/service module 08-06-16-121
•Modular cable 08-06-16-115
•Bus cable for DETF-LEM 08-06-16-125
•Loading weights
•For scales with DETF sensor at least 5 weight stages up to the MAX
•For scales with DMS load cell at least 1 weight stage (=MAX)
Software Installation
If your 'SERVA'-software is in a ZIP-file, it has to be unpacked at first.
Execute the program's SETUP.EXE and follow the instructions displayed by the setup program.
Connecting and calibrating a scale
•If the service module has not been connected to the PC yet, shut the PC down, connect the service
module to the serial interface and reboot the PC.
PC
Drucker
Printer
Vorderseite / Frontside Rückseite / Backside
Waage \ Scale
Anzeige / Display
•Switch off the scale!
•For calibration, a connection between the service module and the measured-value
acquisition module of the scale to be calibrated must be established. For this purpose, a
modular cable must be connected to the scale’s SeSAM bus.

seca page 2(2) PC configuration program
17.06.03-Wint/Rei 30-34-00-672 b
Standard case Connection to the existing display unit port.
The display can instead be connected to the second modular
socket of the service module.
DMS module with integrated display
08-06-18-082
If there is no modular socket on the back of the PCB,
retrofit one.
DETF module with integrated display
08-06-18-051
08-06-18-073
Pick off the signal directly from the PCB via the DETF LEM bus
cable.
•Once the cables have been correctly connected, start the scale.
•Start the software 'SERVA' from the programs menu.
•The 'Help'-menu of the 'SERVA'-program contains detailed instructions for available operations

Service Manual Replacement instructions
19.08.04/Rei 130-34-00-673 d
seca 664, 665
Removing the power supply unit / ESD protection measures (Page 7)
The power supply unit must not be connected.
We urgently recommend that you remove the battery pack before starting any work on the unit:
Remove the 2 screws (Item 7.11) and the battery cover (Item 7.12).
Pull the rechargeable battery connection apart (cable).
Remove the rechargeable battery pack (Item 7.8).
ESD protection measures must be taken whenever work is performed on electronic components.
Disassembly (the references to pages and items relate to the replacement instructions drawing, Pages 5-13)
1. Removing and dismantling the column (Page 5)
Disengage the cable (Item 5.3) under the scale.
Release the cable from the cable terminals.
Release the two screw connections (Item 5.1).
1.1 Dismantling the joint and locking unit (Page 12)
Remove the plug (Item 12.13).
Hold the bolt (Item 12.4) in the column tube (using suitable pliers which do not damage the surface of
the bolt) and unscrew the knurled nut (Item 12.1).
The thread is glued in place and difficult to slacken.
Remove the bolt and the compression spring (Item 12.3).
Turn the bracket (Item 12.9) so that the screw (Item 12.7) is accessible and slacken the screw
connection (Item 12.7). Hold the self-locking hex nut in the column tube using a suitable spanner.
Pull the cable (12.12) out of the unit.
Release the lock screw (Item 12.5) using a suitable tool.
Remove the threaded axle (Item 12.11) and remove the two slip rings (Item 12.8, 12.10) and the
bracket.
If required: Remove the slip ring (Item 12.2) (glued) and clean the bearing surface (Item 12.6).
1.2 Removing the display housing (complete with joint) (Page 12)
Remove the 3 screws (Item 12.14).
Pull the column off the bearing bush (Item 12.15) and the cable (Item 12.12).
1.3 Dismantling the display housing (Page 13)
Remove the screws (Item 13.1) and lift off the upper part of the housing (Item 13.9).
If required: Remove the membrane keyboard (Item 13.11).
Warning: The membrane keyboard is glued on and cannot be replaced in the same quality.
If required: Remove the film strips (Item 13.10).
Warning: The film strips is glued on and cannot be replaced in the same quality.
Depending on the model: Unsolder the cable (Item 13.12)
Remove the screws (Item 13.8).
Lift off the PCB (Item 13.7) and detach the cable’s plug-in connection (Page 12, Item 12.12).
Remove the cable through the central opening in the housing.
Lift off the upper guide rails (Item 13.6), the drawer (Item 13.4) and the lower guide rails (Item 13.3).
If required: Pull the battery compartment (Item 13.5) out of the drawer.
Depending on model: Remove the screws (Item 13.14). There could be spacers under the screw
heads. Lift off the PCB (Item 13.13)

Service Manual Replacement instructions
19.08.04/Rei 230-34-00-673 d
1.4 Removing the joint connection from the display housing (Page 12)
Dismantle the display housing as described under 1.3.
Remove the screws (Item 12.23).
Disengage the housing (Item 12.22) from the snap-in connection with the tilt stand (Item 12.20).
Remove the screws (Item 12.21) and lift off the tilt stand.
Remove the screws (Item 12.19) and lift off the plate (Item 12.18).
If required: Remove the pin (Item 12.16) and pull the pivot pin (Item 12.17) out of the bearing bush
(Item 12.15).
2. Removing and dismantling the frame (Page 5)
Release the 4 screw couplings (Item 5.2).
2.1 Removing the housing for the evaluation electronics and the battery pack (Page 6)
Remove the 2 screw couplings (Item 6.8) and lift off the housing (Item 6.9) and the supporting disks
(Item 6.10).
2.1.1. Dismantling the housing for the evaluation electronics and the battery pack (Page 7)
Remove the 4 screws (Item 7.1) and lift off the end plate (Item 7.2).
Remove the 4 screws (Item 7.3) and lift off the end plate (Item 7.4).
Warning:The housing is no longer held together.
Lift off the housing half (Item 7.5).
If not yet done: Remove the battery pack (Item 7.8).
Remove the filler pieces (Item 7.9).
Lift off the PCB (Item 7.7).
If required: Unsolder the load cell, mains socket and rechargeable battery cables from the board.
If required: Remove the PCB guard (Item 7.10).
If required: Remove the 2 screws (Item 7.11) and the battery cover (Item 7.12).
If required: Remove the cable gland (Item 7.13).
First of all, remove the ferrite from the cable of the mains socket (Page 8). Then pull out the cables of
the load cells and the mains socket.
If required: Remove the cable gland (Item 7.13).
2.1.2. Removing the rechargeable battery connection cable (Page 7)
If required: Unsolder the rechargeable battery cable from the PCB (Item 7.7).
2.2 Removing the holder for mains socket and bubble level (Page 6)
Remove the 2 screw couplings (Item 6.11) and lift off the holder (Item 6.12) and the supporting disks
(Item 6.13).
2.2.1 Removing mains socket and cable (Page 8)
Remove the screw (Item 8.4).
Remove the 2 screws (Item 8.1).
Remove mains socket and cable (Item 8.2). (For unsoldering see 2.1.1).
2.2.2 Removing a defective bubble level (Page 8)
Warning: Only remove the bubble level if it is defective, as destruction of the bubble level cannot be
avoided. A new bubble level can only be fitted by a skilled person working with great care!
Lever the bubble level (Item 8.6) out of the holder. Scratch the holder free and clean it.
2.3 Removing a load cell (Page 6)
Remove the 2 screw couplings (Item 6.1) and lift off the load cell cover (Item 6.2).
Remove the 4 nuts and washers (Item 6.3) and lift off the load cell (Item 6.4).

Service Manual Replacement instructions
19.08.04/Rei 330-34-00-673 d
Warning: Carefully thread the load cell cable out of the frame tubes. (For unsoldering see 2.1.1).
Remove the spacer disks (Item 6.5) and the screws (Items 6.6, 6.7). Warning: The longer screws
(Item 6.7) are used to screw the load cell cover tight.
2.4 Removing the adjusting feet (Page 6)
Screw out the complete foot (Items 6.14, 6.15) and screw off the knurled nut (Item 6.15).
3. Dismantling the platform
If required: Remove the cable gland (Item 7.13).
First of all, remove the ferrite from the cable of the mains socket (Page 8). Then pull out the cables
of the load cells and the mains socket.
3.1 Removing the castors and the left-hand rail (Page 9)
Release the 4 screw couplings (Item 9.1).
Remove the castors (Item 9.2), the backplates (Item 9.3) and the rail (Item 9.4).
3.2 Removing the right-hand rail (Page 9)
Release the 4 screw couplings (Item 9.5).
Remove the rail (Item 9.6).
3.3 Removing a platform reinforcing plate (Page 9)
Release the 2 screws couplings (Item 9.7).
Remove the platform reinforcing plate (Item 9.8)
3.4 Removing a hinged ramp (Page 10)
Slacken the 2 screws (Item 10.1).
Pull off the ramp (Item 10.3), together with the end plate (Item 10.4) and unhook the end plate (Item
10.4) from the bearing in the platform (Item 10.09).
Unhook the end plate (Item 10.2) from the bearing in the platform.
Remove the 2 screws (Item 10.5) and remove the end plate (Item 10.4).
3.5 Removing a ramp stop (Page 10)
Slacken the 2 screw connections (Item 10.6).
Remove the stop (Item 10.8) and the spacer bushes (Item 10.7).
3.6. Removing the platform Insert (Page 11)
Slacken the 8 screw connections (Item 11.1).
Lift off the platform reinforcing plate (Item 11.2).
3.7 Removing the rubber elements (Page 11)
Turn off the rubber elements and lift off the washers (Pos. 11.3)
Remove the 8 bolted connections (Pos. 11.1)
3.8 Removing the mat and the screws
If require : Remove the mat (Pos. 11.4)
Attention : Remove the mat carefully to avoid overexpansions.
if require : remove the screws ( Pos. 11.5 and 11.6).

Service Manual Replacement instructions
19.08.04/Rei 430-34-00-673 d
Assembly (the references to pages and items relate to the replacement instructions drawing, Pages 5-13)
Assemble in reverse order of disassembly.
Please note the following points:
1. Glue on the mat (Page 11)
Mounting the following parts before you glue on the mat:
The 4 rubber elements and washers (Item 11.3) with the screws (item 11.5).
The platform reinforcing plate (item 11.2) with the screws (item 11.6) and the nuts and washers (item
11.1)
The mat is attached with a special double-sided adhesive tape.
2. Fitting a new load cell (Page 6)
After replacing load cells, the scale must be readjusted and calibrated if required. For adjustment, please
follow our calibration instructions, document no. No. 30-34-00-672.
3. Holder for mains socket and bubble level (Page 6)
If you have dismantled the holder or fitted a new bubble level, the scale must be tested again and
readjusted and calibrated if required.
4. Housing for evaluation electronics and battery pack (Page 7)
Behind the cable gland directly in the housing, the mains socket cable must be winded on a ferrite ring
(Page 8, Item 8.12). The cable must be pulled through the ring 5 times.
When soldering the load cell, mains socket and rechargeable battery cables onto the PCB (Item 7.7)
make sure the cables are allocated correctly to the soldering pads. Solders without any fluxing agent
residues must be used.
5. Display housing (complete with joint) (Page 12)
If the complete unit is inserted into the column tube, make sure the bearing bush (Item 12.15) is fitted in
the correct position to ensure that the display can be turned to the right angle (see drawing).
6. Assembling the display housing (Pages 12,13)
Prior to assembling, the joint and the carrier unit (Page 12, Items 12.15 to 12.22) must have been
completely assembled.
Fit the cable (Page 12, Item 12.12):
Thread the cable through the central opening in joint connection and housing
Plug it into the PCB (Page 13, Item 13.7).
Place the cable in the housing behind the plastic pins so that the drawer and the battery compartment
can still be moved after the housing has been assembled.
7. Joint and locking unit (Page 12)
Cable (Item 12.12):
Anew cable should be adjusted to the required length and tied up with cable ties (see the original
cable).Setting the joint:
Screw the threaded axle (Item 12.11) so far into the thread of the bearing block (Item 12.6) that the
bracket (Item 12.9) can be turned easily and without any play.
Screw the lock screw (Item 12.5) against the threaded axle and check that the joint does not have any
play. Readjust the threaded axle and lock it in position if required.
The thread of the bolt (Item 12.4) and the knurled nut (Item 12.1) should be secured in a medium-tight
position with a screwlock.