- ZU control board (ZUCB)
- 2nd folding stopper motor (M603)
- 2nd folding stopper home sensor (PS604)
- Check the connector connection and the wiring between ZUCB and motor/sensor, and repair it if any abnormality.
- Check the I/O drive of the motor and the coupling of the gear, and repair/replace it if any abnormality. (Wiring diagram: ZU-608: 2-B)
- Check I/O and the operation of the sensor, and repair/replace it if any abnormality. (Wiring diagram: ZU-608: 3-B)
- Replace PS604.
- Replace M603.
- Replace ZUCB.
