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It is essential that the speed on the second source is closely matched to the speed from the
gearbox sensor. To verify this, and correct where necessary, press the up arrow on the
tachograph once to view the dual speed source screen as shown below.
Run the vehicle at 50km/h and adjust the C3 speed factor until speed 2 is as close to speed 1 as
possible. The difference between speed 1 and speed 2 must not exceed 10km/h.
7.18. Tachograph reset
Tapping sends a reset pulse by simulating an Off/On condition which resets
default in the tachograph. No screen displayed on Optimo, however
there is an interruption on the tachograph display.
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