BIKE FORMA: Service & Maintenance Manual - rev. 1.0
Page 6.13
6.7. THE SPEED SIGNAL IS INCORRECT
The speed signal is incorrect if:
•
The brake disk is incorrectly fixed to the flywheel;
•
The speed sensor is defective;
•
The brake board is defective.
Does the speed sensor send
the correct signal to the brake
board?
2
Replace the speed sensor
NO
Replace the brake board
YES
Is the brake disk correctly f ixed
to the f ly wheel?
THE SPEED IS
INCORRECT
1
Fix it correctly
NO
YES
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1)
Check that the 6 screws fixing the disk brake to the flywheel are all locked down.
The speed sensor detects the heads of these screws.
(2)
Place the tester probes across the terminals of the speed sensor. The measured signal should
be that indicated in Figure 3.2-1. In addition, when pedaling at 80 RPM the frequency of the
signal should be 107 Hz.
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