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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 the tachograph. No
screen is displayed on Optimo² when this happens, however there is an interruption to the
tachograph display.
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