C3731 (bizhub C368/C308/C258)

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Trouble typeC3731: Fusing abnormally high temperature detection (Hard protector)
RankA
Trouble detection conditionThe hard protector signal error is detected for a given period of time consecutively.
Trouble isolation–
Relevant electrical parts• Fusing unit
• Heating roller thermistor/1 (TH1)
• Heating roller temperature sensor (TEMS)
• Heating roller thermistor/2 (TH2)
• MFP board (MFPB)

 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 fusing unit and MFPB for proper connection and correct or change as necessary.
  4. Replace the fusing unit. (Part# A161R71888)
  5. Replace MFPB. (Part# A7PUH02123)

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

K.3.13.6 (Link to the Field Service Manual)