- Paper feed assist fan /Rr1 (FM20)
- Printer control board (PRCB)
- Check the connector connection and the wiring between PRCB and the fan, and repair it if any abnormality.
- Rotate the fan or I/O by hand, and repair it if any abnormality, (Wiring diagram: Main body (2/4): 17-A)
- Replace FM20.
- Replace PRCB.
