- FNS control board (FNSCB)
- Stack assist motor (M8)
- Stack assist home sensor (PS11)
- Check the connector connection and the wiring between FNSCB 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: FS-532: 6-F)
- Check I/O and the operation of the sensor, and repair/replace it if any abnormality. (Wiring diagram: FS-532: 12-B)
- Replace PS11.
- Replace M8.
- Replace FNSCB.
