C3726 (bizhub C650i/C550i/C450i)

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Trouble typeC3726: Fusing abnormally high temperature detection (Center of the heating roller)
RankA
Trouble detection conditionDetected temperature of the heating roller thermistor/Ctr (TH2) goes beyond a given temperature for a given period of time consecutively.
Trouble isolation–
Relevant electrical parts-Fusing unit
-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. (C650i/C550i Part# AA7NR70200 / C450i Part# AA7RR70700)
  6. Replace CPUB. (C450i Part# AA7RH02P02 / C550i Part# AA7PH02P01 / C650i Part# AA7NH02P03)
  7. Replace BASEB. (Part# AA7NH02102)

L.3.10.9 (Link to the Field Service Manual)