C3722, C3725 (C4751i)

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ByEric Ditges
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NOTE

  • Before parts replacement, do not carry out “trouble resetting by the trouble reset key”. If the trouble resetting is carried out, abnormal heating may occur and smoke may be emitted.

Contents

Trouble typeC3722: Fusing abnormally high temperature detection (Edge of the heating roller)C3725: Fusing abnormally high temperature detection (Main of the heating roller)
RankA
Trouble detection conditionC3722: Detected temperature of the heating roller thermistor/Edg (TH1) goes beyond a given temperature for a given period of time consecutively.C3725: Detected temperature of the heating roller temperature sensor (TEMS) goes beyond a given temperature for a given period of time consecutively.
Trouble isolation–
Relevant electrical partsFusing unitC3722: Heating roller thermistor/Edg (TH1)C3725: Heating roller temperature sensor (TEMS)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. Replace DCPS.

(Link to the Field Service Manual)