VDO Cyclecomputing C1DS Instruction Manual page 23

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IMPORTANT: On inserting the battery into the transmitter, the coding of the digital
signals is automatically generated. The computer is only able to find the coded
signal at the initial putting into operation. After a battery change, a new coding is
generated in the transmitter. In this case, the computer won't find the coded signal
and a manual transmitter search is required (DIGI CONNECT RESET) – see chapter
3.1.
After every start a green LED at the transmitter flashes for 20 sec. only The flashing
LED indicates a working transmitter.
TIP for battery change: VDO recommends an annual battery change. Buy a spare battery in
due time to avoid unwanted loss of data. When changing the battery, all basic settings are
reset to default values. Note your individual wheel sizes and accumulated mileages (odometer
WS 1 / odometer WS 2) for both bikes before you remove the battery.
Reprogram this data after the new battery has been installed.
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