
Technical Product Manual
Fault analysis and repairs 1318
4 Checking and adjusting
Section 4: Checking and adjusting • Edition 12/2005
TU00-1318-0200302 © Siemens VDO Trading GmbH Section 4 4–21
4.8 Adjusting unit test bench display
4.8.1 Speed calibration adjustment (km/h, mph)
Procedure
Set the coding switch (8), Fig. 4-4, to k = 8000 imp/km with switches 2,3 and 9.
See Section 7, "Setting coding switch"
Insert the tachograph chart(s) and close the unit cover.
Connect the unit to the electricity and drive it on the test bench.
Increase the test bench drive rpm slowly and evenly until the end of the scale
is reached and turn it back slowly.
The speed indicator should follow evenly and without a noticeable
delay.
Depending on the unit's nominal value, set speed adjustment 1 on the test
bench and adjust the unit display to the adjustment value using a potentiome-
ter (1).
Set speed adjustment 2 on the test bench and adjust the unit display to the
adjustment value using a potentiometer (2).
Repeat the adjustment procedure until the adjustment values match.
4.8.2 Modifying speed calibration adjustment (from 07.98)
Fig. 4-19 Modifying the speed calibration adjustment (from 07.98)
Standard since 07.98. The adjustment table remains valid in its unmodified condition.
The RPM coding switch setting remains as before.
Modification
All switches are switched on except for number (10).
1 Coding switch
1
kk
imp/km
imp/km
7985...
7954...
8014
7984
7970
8000
4098...
4090...
4105
4097
4094
4102
23
456
8
79
_
1
123_ _ _ _ _9_
_23_ _ _ _ _9_
1
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