C3922,C3925,C3926 (bizhub 950i/850i)

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Trouble type– C3922: Fusing sensor wire breaks detection (Edge of the heating roller)

– C3925: Fusing sensor wire breaks detection (Main of the heating roller)

– C3926: Fusing sensor wire breaks detection (Center of the heating roller)
RankA
Trouble detection condition– C3922: The maximum value and minimum value of detected temperature of the heating roller thermistor/Edg (TH1) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below a given temperature.

– C3922: The maximum value and minimum value of detected temperature of the heating roller temperature sensor/2 (RD2) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below a given temperature.

– C3925: The maximum value and minimum value of detected temperature of the heating roller temperature sensor/1 (RD1) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below a given temperature.

– C3926: The maximum value and minimum value of detected temperature of the heating roller thermistor/Ctr (TH2) is compared after a lapse of given time from starting of warm up and the gap between the value of maximum and minimum is below a given temperature.
Trouble isolation–
Relevant electrical parts– Fusing unit
– C3922: Heating roller thermistor/Edg (TH1)
– C3922: Heating roller temperature sensor/2 (RD2)
– C3925: Heating roller temperature sensor/1 (RD1)
– C3926: 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 CN807-BASEB CN30E for proper connection and correct as necessary.
  4. Check CPUB for proper installation and correct as necessary.
  5. Replace the fusing unit.
  6. Replace CPUB.
  7. Replace BASEB.

(Link to the Field Service Manual)