Troubleshooting
Model: C520U/C531U
Malfunction: Unit will not start (alternator).
Circumstance: Pedal on the unit; the display does not light.
Possible causes: 1. Wires are not connected.
2. Drive board is malfunctioning.
Troubleshooting: 1. Inspect wire and bridge board connections.
2. Inspect the alternator wires.
3. Inspect wire connections and fuse F1 and power
indicator LED on the drive board.
4. Replace the drive board.
5. Inspect the display board IC pins.
3-1-1
Drive
Board
Display
board
Alternator
Reed switch
Drive board
F1 fuse
Inspect power and CLK
LED indicators.
Inspect alternator
wire connections.
Inspect IC
Display power indicator LED1
Inspect reed switch
