C3903 (bizhub 754e/654e)

Contents

Trouble type	Thermostat tripping
Trouble code	C3903
Rank	A
Detection timing	During warm-up, the thermostat tripping detection signal continues to be H for the set period of time.
Trouble isolation	–
Relevant electrical parts	• Fusing unit • Heating roller thermostat (TS1) • IH power supply (IHPU) • Noise filter (NF1) • Printer control board (PRCB)

  (2)Procedure

Step	Action	Control signal	Location of electrical components
1	Check the fusing unit for correct installation (whether it is secured in position).	–	–
2	Check the open/close operation of the upper right door.	–	–
3	Check the fusing unit, IHPU, NF1 and PRCB for proper connection and correct or change as necessary.	–	–
4	Replace the fusing unit (Other area except Taiwan/Only for Taiwan) (Part# A2X0R71055)	–	–
5	Replace IHPU (Part# A2X0R71055)	–	–
6	Replace PRCB (Part# A55VH00105)	–	–
7	Replace NF1 (Part# A2XKM40J00)	–	–

• Link to the layout drawings for related parts by each trouble code (S.72. C3722, C3726, C3822, C3903, C3922, C3926 (Other area except Taiwan))
• Link to the layout drawings for related parts by each trouble code (S.73. C3722, C3726, C3822, C3903, C3922, C3926 (Only for Taiwan))

Document Information ID D0001104783 Revise ID R000004

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

K.3.8.13 (Link to the Field Service Manual)