C392B (bizhub C4050i/C3350i)

Contents

Trouble type	C392B: Fusing sensor wire breaks detection (difference of temperature)
Rank	A
Trouble detection condition	The difference between the temperature corrected by the heating roller thermistor/Edg (TH1) and the temperature detected by the heating roller thermistor/Ctr (TH2) exceeds a predetermined value.
Trouble isolation	–
Relevant electrical parts	• Fusing unit • Heating roller thermistor/Edg (TH1) • Heating roller thermistor/Ctr (TH2) • DC power supply (DCPS) • CPU board (CPUB) • Base board (BASEB)

Procedure

1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit. (Part# AAJRR70300)
7. Replace CPUB. (Part# A93EH01004)
8. Replace BASEB. (Part# A93EH02007)
9. DCPS F102 or FU181 conduction check.
10. Replace DCPS. (Part# AAJRR70600)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

L.3.8.7 (Link to the Field Service Manual)