Seca 2841300009 User manual

for seca 284/285
Service Manual
2841300009
2841300109
2857000009
2857000099
2857000159
2857000199
2857000229
2857000249
Measuring station, digital
Valid as of: 01.08.2011
Variants:
Service instructions electronic 30-34-00-812 a
Content:
Cable plan 08-02-06-053 a
Cableplan slider 08-02-06-052 b
Replacement 30-34-00-811
Spare parts 284-13-00-009
Spare parts 284-13-00-109
Spare parts 285-70-00-009
Spare parts 285-70-00-099
Spare parts 285-70-00-159
Spare parts 285-70-00-199
Spare parts drawing slider 30-19-17-252
Spare parts drawing Display 30-34-00-803
Description:
Service Manual Number
17-05-01-353-a
Spare parts baseframe 30-34-00-804
Manual number: 17-05-01-353-a

General information seca
17.08.11/RLEU/ARI/MRE 1/36 30-34-00-812a
Electronics (NEC2) Service
Instructions
MODEL
[374|376|378|703|704|264|274|284|285|954|957|959|963]

General information seca
17.08.11/RLEU/ARI/MRE 2/36 30-34-00-812a
Contents
1 General Information [374|376|378|703|704|264|274|284|285|954|957|959|963]..................... 4
1.1 Type Plates [374|376|378|703|704|264|274|284|285|954|957|959|963].....................4
1.2 Design and Function of the Scale Part
[374|376|378|703|704|264|274|284|285|954|957|959|963] ......................................................5
1.2.1 Design [374|376|378|703|704|284|285] ..............................................................5
1.2.2 Function [374|376|378|703|704|284|285]............................................................5
1.3 Design and Function of the Head Slider [264|274|284|285]........................................6
2 Maintenance [374|376|378|703|704|264|274|284|285|954|957|959|963]................................ 7
2.1 Adjustment of Scales [374|376|378|703|704|284|285|954|957|959|963] ....................7
2.1.1 General [374|376|378|703|704|284|285|954|957|959|963].................................7
2.1.2 Calibration Counter / Number of Adjustments
[374|376|378|703|704|284|285|954|957|959|963]................................................................8
2.1.3 Adjustment Mode and Displaying the Calibration Counter Contents
[374|376|378|703|704|954|957|959|963]..............................................................................8
2.1.4 Adjustment Mode and Displaying the Calibration Counter Contents [284|285]..8
2.1.5 Placing Adjustment Weights on the Scale
[374|376|378|703|704|284|285|954|957|959|963]................................................................8
2.1.6 Example: Adjusting a Scale with 100 g Graduations [703|704|284|285]............9
2.1.7 Example: Adjusting a Baby Scale with 10 g Graduations [374|376]...................9
2.1.8 Overview of Adjusting a Scale with 100 g Graduations [703|704]....................10
2.1.9 Overview of Adjusting a Baby Scale with 10 g Graduations [374|376|378]......12
2.2 Adjusting the Head Slider [284|285] ..........................................................................13
2.3 Displaying the Gravity Factor [374|376|378|703|704|284|285|954|957|959|963]......13
2.4 Setting the Gravity Factor [374|703|284|954]:...........................................................14
2.4.1 Example for Gravity Factor Setting [374|703|284|954].....................................15
2.4.2 Summary of a Typical Gravity Factor Setting Sequence [374|703]..................15
3 Errors [374|376|378|703|704|284|285|954|957|959|963]....................................................... 17
3.1 Error Symptoms for Scale [374|376|378|703|704|284|285].......................................17
3.2 Error Symptoms for Head Slider [374|376|378|703|704|284|285|954|957|959|963].18
3.3 Radio Error Symptoms [374|376|378|703|704|284|285]............................................18

General information seca
17.08.11/RLEU/ARI/MRE 3/36 30-34-00-812a
3.4 Scale Error Messages [374|376|378|703|704|284|285|954|957|959|963].................20
3.5 Head Slider Error Messages [264|274|284|285]........................................................21
3.6 Radio Error Message [374|376|378|703|704|284|285|954|957|959|963]..................22
4 Measurements [374|376|378|703|704|264|274|284|285|954|957|959|963]........................... 23
4.1 Supply Voltage [374|376|378|703|704|264|274|284|285|954|957|959|963]..............23
4.2 Load Cell [374|376|378|703|704|284|285|954|957|959|963].....................................23
4.2.1 Measurement Using a Multimeter
[374|376|378|703|704|284|285|954|957|959|963]..............................................................23
5 Software intended Purpose.................................................................................................... 26
5.1 Installation and Start..................................................................................................26
5.2 Updating the Radio Module Software........................................................................27
5.3 Set-up Process...........................................................................................................28
5.4 Updating the Radio Module Software........................................................................29
5.5 Technical Requirements for Updating .......................................................................30
5.6 Updating the Wireless Printer Software.....................................................................30
5.7 Updating Old Printers.................................................................................................31
5.8 Problems with Updating.............................................................................................31
Appendixes.................................................................................................................................. 32

General information seca
17.08.11/RLEU/ARI/MRE 4/36 30-34-00-812a
1 General Information
[374|376|378|703|704|264|274|284|285|954|957|959|963]
These service instructions are intended for specialist staff responsible for
maintenance and repair of the devices. These persons must be familiar with all
the relevant electro-technical regulations and must adhere to them any time.
These instructions are not suitable for users without specialist knowledge.
These instructions describe how to service the devices
[374|376|378|703|704|264|274|284|285] equipped with NEC2 electronic
modules. The device types for which these instructions apply are listed in the
section headings. There are some identical models with NEC1 electronic
modules. These instructions are not valid for those types.
What is the structure of this document and how should you read it? Section 1
provides a short overview of the most important points for service. We
recommend you should read it completely. Section 2 deals with the
maintenance of the devices, i.e. work that may have to be carried out more
frequently. This section can be read as and when required. Troubleshooting is
covered in section 4, where you find detailed descriptions of various
measurements intended to identify specific errors. Starting point for
troubleshooting is section 3, which includes an overview of error descriptions
and the inspection steps required to identify them.
1.1 Type Plates
[374|376|378|703|704|264|274|284|285|954|957|959|963]
To enable you to identify the device, information about the model and serial
number is found on the underside or on the frame of the device (see Figure 1:
Type plate (left: approved [376|378|704|385]; right: non-approved) [376|703|284])
Note down this information so that you have it on hand in case you need to
contact us for queries or spare parts orders.
Figure 1: Type plate (left: approved [376|378|704|385]; right: non-approved) [376|703|284])

General information seca
17.08.11/RLEU/ARI/MRE 5/36 30-34-00-812a
1.2 Design and Function of the Scale Part
[374|376|378|703|704|264|274|284|285|954|957|959|963]
1.2.1 Design [374|376|378|703|704|284|285]
The scale consists of the following main parts: the frame with up to four load
cells, a display unit, a key panel and a power supply unit.
1.2.2 Function [374|376|378|703|704|284|285]
The action of a force causes elastic deformation of the load cell. A
corresponding analog signal is supplied, which changes linearly with the force
applied. This signal is measured and evaluated by the scale electronics and
displayed as a weight value. Figure 2: Functional diagram [704|284|285]
shows the functional diagram for scales with separated modules for
determining and displaying the weight. Figure 3: Functional diagram
[374|376|378|703]
shows the functional diagram for scales with a single electronic module for
weight measurement and display.
Figure 2: Functional diagram [704|284|285]
ISIS BUS (Modular cable)
NEC2 DMS Module (Weight measurement)
08-06-18-156
Load
cell Load
cell Load cell Load cell
NEC2 Display module
08-06-18-170 oder -195
Radio module
08-06-18-172
Keyboard
DC Supply

General information seca
17.08.11/RLEU/ARI/MRE 6/36 30-34-00-812a
Figure 3: Functional diagram [374|376|378|703]
1.3 Design and Function of the Head Slider [264|274|284|285]
The head slider uses the measuring method of visual reading off from the insert
scale. Absolute and relative graduation marks are scanned to determine
lengths. Once the slider has moved more than two absolute marks, the absolute
position can be determined and a length is output.
Figure 3: Absolute (left) and relative graduation marks (right) [264|274|284|285]
NEC2 Compact module
(Weight measurement and display)
08-06-18-167 oder -163
Load
cell Load cell Load cell Load cell
Radio modulel
08-06-18-172
Keyboard
DC Supply

Maintenance seca
17.08.11/RLEU/ARI/MRE 7/36 30-34-00-812a
2 Maintenance
[374|376|378|703|704|264|274|284|285|954|957|959|963]
The following section provides an overview of all maintenance jobs which can
be carried out.
2.1 Adjustment of Scales
[374|376|378|703|704|284|285|954|957|959|963]
2.1.1 General [374|376|378|703|704|284|285|954|957|959|963]
To compensate for linear measuring deviations, which occur e.g. as a result of
gravity variations in different gravity zones, the scale offers an adjustment
feature. This adjustment must also be carried out whenever the load cell is
replaced.
seca scales with modular NEC-G2 electronics are fitted with a software-
controlled adjustment device that is controlled using the existing operating
elements. When developing the adjustment device, special attention was paid
to the following requirements:
It must be possible to readjust scales without any additional external
equipment/tools.
The readjustment device must be admissible for verification.
It must be possible to readjust the scales without calibrated test weights.
The readjustment device must be protected against inadvertent use.
Scale adjustment can be carried out manually as described in section 0 „Scales
fitted with the new, modular electronics are equipped with a calibration counter
allowing a software adjustment to be carried out in accordance with the
requirements for verified scales. Each completed adjustment procedure is
registered by the calibration counter, i.e. the number is automatically
incremented by 1. Non-approved scales are also fitted with a counter which
counts the number of adjustments.
” or using seca serva 2.0. Manual adjustment will not correct any corner errors.

Maintenance seca
17.08.11/RLEU/ARI/MRE 8/36 30-34-00-812a
2.1.2 Calibration Counter / Number of Adjustments
[374|376|378|703|704|284|285|954|957|959|963]
Scales fitted with the new, modular electronics are equipped with a calibration
counter allowing a software adjustment to be carried out in accordance with the
requirements for verified scales. Each completed adjustment procedure is
registered by the calibration counter, i.e. the number is automatically
incremented by 1. Non-approved scales are also fitted with a counter which
counts the number of adjustments.
2.1.3 Adjustment Mode and Displaying the Calibration Counter
Contents [374|376|378|703|704|954|957|959|963]
To begin readjustment or to display the calibration counter contents, start the
scale while pressing another key at the same time. The contents of the
calibration counter (i.e. the number of adjustment procedures carried out so far)
are then displayed for 18 seconds (flashing).
While the calibration count is displayed, a key must be kept pressed (for more
than 1.5 seconds) to switch the scale to adjustment mode.
2.1.4 Adjustment Mode and Displaying the Calibration Counter
Contents [284|285]
To begin readjustment or to display the calibration counter contents, start the
scale and press another key while the display shows seca. The contents of the
calibration counter (i.e. the number of adjustment procedures carried out so far)
are then displayed for 18 seconds (flashing).
While the calibration count is displayed, a key must be kept pressed (for more
than 1.5 seconds) to switch the scale to adjustment mode.
2.1.5 Placing Adjustment Weights on the Scale
[374|376|378|703|704|284|285|954|957|959|963]
Once you have switched to adjustment mode as described in section 0 or 2.1.4,
the display shows the text “CAL”. By pressing any key except for the start key
for more than 1.5 seconds, the actual readjustment mode is activated. The
display reads "dec". The weight value currently measured then appears. The
scale is in decrementing state. To switch over from decrementing to
incrementing mode and vice versa press a key for more than 1.5 seconds with a
test weight placed on the scale. The display will read “dec” or “inc” accordingly.
The test weight is at least 25% of the max. load of the scale (we recommend
approx. 66-75%).

Maintenance seca
17.08.11/RLEU/ARI/MRE 9/36 30-34-00-812a
Adjustment can now be completed by pressing a key until the display shows
“Sto”. The scale computes and stores a new linearity coefficient and switches
off automatically. Your scale is now adjusted. Remove the test weight.
Note:
Timeout control is not active for the phase of placing and confirming the test weight.
To minimize adjustment errors, readjustment can only be carried out using a test
weight above 25 % and below 100 % of the max. load. Otherwise the error “Er:x:15”
will be displayed.
2.1.6 Example: Adjusting a Scale with 100 g Graduations
[703|704|284|285]
The selected test weight is 200 kg.
The current weight shown on the display is 199.7 kg (max. deviation of 300 g).
In this example, you must switch the scale to incrementing mode to carry out
readjustment. When the tare/hold key has been pressed (for more than 1.5
seconds), "inc" starts flashing.
Now increase the value by the first 10 g (by briefly pressing the tare/hold key).
After this has been repeated x times, the value 200.0 (rounded!) appears on the
display although the internal measured value still is 199.95 kg (not rounded!).
To correct this rounding error, increment the value five times by 10 g to obtain
exactly 200.00 as the calculated value.
Complete the readjustment procedure as described in section 2.1.5.
2.1.7 Example: Adjusting a Baby Scale with 10 g Graduations
[374|376]
The selected test weight is 15 kg. The current weight shown on the display is
14.970 kg (max. deviation of 30 g).
In this example, you must switch the scale to incrementing mode to carry out
readjustment. When the tare/hold key has been pressed (for more than 1.5
seconds), "inc" starts flashing.
Now increase the value by the first 1 g (by briefly pressing the tare/hold key).
Each alteration is shown on the display.

Maintenance seca
17.08.11/RLEU/ARI/MRE 10/36 30-34-00-812a
Complete the readjustment procedure as described in section 2.1.5.
2.1.8 Overview of Adjusting a Scale with 100 g
Graduations [703|704]
Action carried out by the user Result
The scale is switched off. No values or characters on the display.
Press the tare/hold key and keep it
pressed while simultaneously pressing
the start key.
The contents of the calibration counter
flash on the display for 18 seconds.
Release both keys. The contents of the calibration counter
flash on the display for 18 seconds.
Press the tare/hold key for more than
1.5 seconds within the next 18 seconds. The system switches to adjustment selection mode and “CAL” flashes on the
display.
18 seconds have passed and no key has
been pressed. The scale switches off.
Press the tare/hold key for more than 1.5
seconds. "dec" appears on the display (flashing) and then the current weight (0.0 - also
flashing).
Place the test weight on the scale. The measured weight of the test weight
appears on the display (flashing).
Decide whether to decrement or to
increment:
Incrementing:
Press the tare/hold key for more than 1.5
seconds.
Decrementing: No action required as the
scale already is in dec mode.
Incrementing mode is activated; "inc"
appears on the display.
No output on the display.
Decrementing or incrementing:
Again briefly press the tare/hold key (for
The measured weight is decremented or
incremented by 10 g. Please remember
that pressing the key does not always

Maintenance seca
17.08.11/RLEU/ARI/MRE 11/36 30-34-00-812a
less than 1.5 seconds). change the value on the display due to
the low display resolution. Only the
rounded value is output.
Repeat this step until the measured
weight matches the test weight (format:
xxx.0 kg).
The display indicates the test weight
(format: xxx.0 kg).
To correct this rounding error, decrement
or increment the value five times by 10 g.
The display indicates the exact test
weight (format: xxx.0 kg).
Press the tare/hold key until the display
shows “Sto”. The display reads “Sto” and the scale switches off automatically.

Maintenance seca
17.08.11/RLEU/ARI/MRE 12/36 30-34-00-812a
2.1.9 Overview of Adjusting a Baby Scale with 10 g Graduations
[374|376|378]
Action carried out by the user Result
The scale is switched off. No values or characters on the display.
Press the tare/hold key and keep it
pressed while simultaneously pressing
the start key.
The contents of the calibration counter
flash on the display for 18 seconds.
Release both keys. The contents of the calibration counter
flash on the display for 18 seconds.
Press the tare/hold key for more than 1.5
seconds. The system switches to adjustment selection mode and “CAL” flashes on the
display.
18 seconds have passed and no key has
been pressed. The scale switches off.
Press the tare/hold key for more than 1.5
seconds. "dec" appears on the display (flashing) and then the current weight (0.000 - also
flashing).
Place the test weight on the scale. The measured weight of the test weight
appears on the display (flashing).
Decide whether to decrement or to
increment:
Incrementing:
Press the tare/hold key for more than 1.5
seconds.
Decrementing: No action required as the
scale already is in dec mode.
Incrementing mode is activated; "inc"
appears on the display.
No output on the display.
Decrementing or incrementing: The measured weight is decremented or

Maintenance seca
17.08.11/RLEU/ARI/MRE 13/36 30-34-00-812a
A
gain briefly press the tare/hold key (for
less than 1.5 seconds). incremented by 1 g.
Repeat this step until the measured
weight matches the test weight (format:
xx.000 kg).
The display indicates the test weight
(format: xx.000 kg).
Press the tare/hold key until the display
shows “Sto”. The display reads “Sto” and the scale switches off automatically.
2.2 Adjusting the Head Slider [284|285]
The head slider electronics must be readjusted whenever the electronics are
replaced. Please refer to the instructions in the operating manual.
2.3 Displaying the Gravity Factor
[374|376|378|703|704|284|285|954|957|959|963]
To view the gravity factor, the scale must first be switched to adjustment mode
(see section 0 or 2.1.4).
As soon as the text “CAL” is displayed, press a key briefly (less than 1.5
seconds).
The display shows “GAL”.
Pressing a key for more than 1.5 seconds displays the gravity factor set. The
gravity factor is shown in mm/s².
The scale switches off again automatically after 18 seconds.
Note [376|378|704|285]:
On verified scales, the gravity factor can only be displayed as long as the calibration
count is 1.

Maintenance seca
17.08.11/RLEU/ARI/MRE 14/36 30-34-00-812a
2.4 Setting the Gravity Factor [374|703|284|954]:
The gravity factor can only be set on non-approved models [374|703|284].
Before the gravity factor can be set, the scale must first be switched to
adjustment mode (see section 0 or 2.1.4).
While the calibration count is displayed, a key must be kept pressed (for more
than 1.5 seconds) to switch the scale to adjustment mode.
As soon as the text “CAL” is displayed, press a key briefly (less than 1.5
seconds). The display shows “GAL”.
Then press a key (for more than 1.5 seconds) to switch the scale to the mode
for gravity factor setting. The display shows “dec” and then the gravity factor
currently set. The gravity factor is shown in mm/s².
The scale is in decrementing state.
If the gravity factor displayed matches the target value, no further setting is
required and the menu item can be closed.
If the gravity factor shown on the display needs to be adjusted, it must be
altered by pressing a key until it matches the gravity factor required. Estimate
whether the required gravity factor is easier to reach by decrementing or by
incrementing. To toggle between decrementing mode and incrementing mode,
press a key (for more than 1.5 seconds.) (Display shows dec or inc.)
Press the key for less than 1.5 seconds to increase or decrease the gravity
factor displayed by 5 mm/s². Repeat the procedure until the gravity factor
displayed and the target gravity factor match.
Gravity factor setting can now be completed by pressing a key until the display
shows “Sto”. The scale stores the new gravity factor and switches off
automatically.

Maintenance seca
17.08.11/RLEU/ARI/MRE 15/36 30-34-00-812a
2.4.1 Example for Gravity Factor Setting [374|703|284|954]
The current gravity factor shown on the display is 98135 kg mm/s².
The target gravity factor is 98150 mm/s².
In this example, you must switch the scale to incrementing mode to set the
gravity factor. When the tare/hold key has been pressed (for more than 1.5
seconds), "inc" starts flashing.
Now start to increase the value by 5 mm/s² (by briefly pressing the tare/hold
key). After this has been repeated three times, the value 98150 mm/s² appears
on the display.
Complete the gravity factor setting procedure as described above.
2.4.2 Summary of a Typical Gravity Factor Setting Sequence
[374|703]
Action carried out by the user Result
The scale is switched off. No values or characters on the display.
Press the tare/hold key and keep it
pressed while simultaneously pressing
the start key.
The contents of the calibration counter
flash on the display for 18 seconds.
Release both keys. The contents of the calibration counter
flash on the display for 18 seconds.
Press the tare/hold key for more than 1.5
seconds. The system switches to adjustment selection mode and “CAL” flashes on the
display.
18 seconds have passed and no key has
been pressed. The scale switches off.
Briefly press the tare/hold key (for less
than 1.5 seconds). “GAL” flashes on the display.
Press the tare/hold key for more than 1.5 "dec" appears on the display (flashing)
and then the current gravity factor - also

Maintenance seca
17.08.11/RLEU/ARI/MRE 16/36 30-34-00-812a
seconds. flashing.
Decide whether to decrement or to
increment:
Incrementing:
Press the tare/hold key for more than 1.5
seconds.
Decrementing: No action required as the
scale already is in dec mode.
Incrementing mode is activated; "inc"
appears on the display.
No output on the display.
Decrementing or incrementing:
A
gain briefly press the tare/hold key (for
less than 1.5 seconds).
The gravity factor displayed is
decremented or incremented by 5 mm/s².
Repeat this step until the gravity factor
displayed matches the target gravity
factor.
The display shows the gravity factor
(format: xxxxx mm/s²).
Press the tare/hold key until the scale
switches off. The display reads “Sto” and the scale switches off automatically.

Errors seca
17.08.11/RLEU/ARI/MRE 17/36 30-34-00-812a
3 Errors
[374|376|378|703|704|284|285|954|957|959|963]
The following section provides an overview of possible error symptoms, their
causes and the steps required to remedy the error. In addition, the error
messages generated by the device and ways to eliminate them are explained.
3.1 Error Symptoms for Scale [374|376|378|703|704|284|285]
Error description Possible causes Remedy
Battery not inserted or flat
(if provided) Check the batteries
Voltage supply defective See section 4.1
Scale does not
start
Key panel defective or not
connected
Check cable
connections, check
cable and key panel
for interruptions,
replace if necessary
Packaging / transport
locking device not removed
completely Check the scale
Scale not correctly adjusted See section 2.1
Load cell damaged See replacement
instructions
Scale shows no
weight or an
incorrect weight
Force transmission into
load cell interrupted
Check base frame for
damage or incorrect
assembly
Measured values
vary greatly
Measurement
electronics/load cell
damaged
See replacement
instructions

Errors seca
17.08.11/RLEU/ARI/MRE 18/36 30-34-00-812a
3.2 Error Symptoms for Head Slider
[374|376|378|703|704|284|285|954|957|959|963]
Error description Possible causes Remedy
Battery not inserted or flat Check the batteries
Voltage supply defective See section 4.1
Head slider does
not start Key panel defective or not
connected
Check cable
connections, check
cable and key panel
for interruptions,
replace if necessary
Insert scale defective /
missing / scale top and
bottom reversed Check the insert scale
Head slider not adjusted
correctly See section 2.2
Light barriers soiled Clean the head slider
barriers with a cloth
Key unit not engaged
correctly Check the key unit
Head slider does
not display a
length or an
incorrect length
3.3 Radio Error Symptoms [374|376|378|703|704|284|285]
Error description Possible causes Remedy
Device does not
transfer any data
when the SEND
or PRINT key is
pressed
Teach-in phase not
completed out successfully
Repeat teach-in
phase (see operating
instructions)

Errors seca
17.08.11/RLEU/ARI/MRE 19/36 30-34-00-812a
Error description Possible causes Remedy
Device beeps
twice when
sending and
printing
Receiving device not
switched on Switch on all devices in the radio network
The device
displays “Wait” at
the end of the
teach-in phase
Two devices are in the
teach-in phase at the same
time
Switch off all devices
within radio
transmission range
and repeat the teach-
in process