Troubleshooting
Model: C520U/C531U
Malfunction: No RPM value
Circumstance: 1. No RPM value appears.
2. When you pedal the display shows no response.
Possible causes: 1. Reed switch and magnet
2. Wires are not connected.
Troubleshooting: 1. Inspect reed switch and magnet.
2. Inspect all cable connections.
3. Inspect the drive board CLK indicator.
4. Pedal at one rotation per second. Display RPM value: 60.
3-3-1
Display
board
Drive board
Speed sensor
Reed switch and magnet
Inspect drive board CLK indicator
LED lights when reed switch and
magnet make contact.
