C3922, C3925, C3926 (C4751i)

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ByEric Ditges
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Contents

Trouble typeC3922: 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 conditionC3922: 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 or above given temperatures.C3925: The maximum value and minimum value of detected temperature of the heating roller temperature sensor (TEMS2) 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 or above given temperatures.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 or above given temperatures.
Trouble isolation–
Relevant electrical partsFusing unitC3922: Heating roller thermistor/Edg (TH1)C3925: Heating roller temperature sensor (TEMS)C3926: Heating roller thermistor/Ctr (TH2)DC power supply (DCPS)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 CN3-BASEB CN10E for proper connection and correct as necessary.
  4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
  5. Check CPUB for proper installation and correct as necessary.
  6. Replace the fusing unit.
  7. Replace CPUB.
  8. Replace BASEB.
  9. DCPS F102 or FU181 conduction check.
  10. Replace DCPS.

(Link to the Field Service Manual)