C3722 (bizhub C287/C227)

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Trouble typeC3722: Fusing abnormally high temperature detection (Edge of the heating roller)
RankA
Trouble detection condition-Detected temperature of the heating roller thermistor/1 (TH1) goes beyond a given temperature for a given period of time consecutively.
-The hard protector signal remains LOW for a predetermined continuous period of time.
Trouble isolation–
Relevant electrical parts-Fusing unit
-Heating roller thermistor/1 (TH1)
-DC power supply (DCPU)
-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 connector between the fusing unit-relay CN4-MFPB CN16E for proper connection and correct as necessary.
  4. Replace the fusing unit. (Part# A797R70211)
  5. Replace DCPU. (Part# A797R70800)
  6. Replace MFPB. (Part# A797H02118)

K.3.10.4 (Link to the Field Service Manual)