- Paper feed assist fan /Fr1 (FM1: PF-703/706)
- PF drive board (PFUDB)
- Check the connector connection and the wiring between PFUDB and the fan, and repair it if any abnormality.
- Rotate the fan by I/O or hand, and repair it if any abnormality. (Wiring diagram: PF-703: 6-F, PF-706: 4-C).
- Replace FM1 and PFUDB.
