C392B (bizhub 650i/550i/450i)

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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) -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 CN95-BASEB CN4E for proper connection and correct as necessary.
4. Check CPUB for proper installation and correct as necessary.
5. Replace the fusing unit.
   650i (Part# AA7NR70200)
   450i/C550i (Part# AA7RR70700)
6. Replace CPUB.
   650i/550i(Part# AC74H02P03)
   450i (Part# AC76H02P02)
7. Replace BASEB. (Part# AC74H02101)

(Link to the Field Service Manual)