C3736 (bizhub 558/458)

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Trouble typeC3736: Fusing abnormally high temperature detection hard protector (Middle of the heating side)
RankA
Trouble detection conditionAn abnormally high temperature is detected on the hard protector circuit (middle of the heating side).
Trouble isolation–
Relevant electrical parts• Fusing unit
• Heating roller thermistor 2 (TH2)
• IH power supply (IHPU) (bizhub 558 only)
• 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-MFPB CN22E for proper connection and correct or change as necessary. (bizhub 558)
  4. Check the fusing unit-MFPB CN12E for proper connection and correct or change as necessary. (bizhub 458)
  5. Check the connector between TEMS/1-relay CN109-MFPB CN15E for proper connection and correct as necessary. (bizhub 558)
  6. Replace the fusing unit. (bizhub 558 Part# A9E8030 / bizhub 458 Part# A79MR70200)
  7. Replace IHPU. (bizhub 558 only)(Part# A8KNM40A02)
  8. Replace MFPB. (558 Part# A9HGH02102 / 458 Part# A9HHH02102)

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

K.3.13.7 (Link to the Field Service Manual)