C3731 (bizhub 4700i)

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Trouble typeC3731: Fusing abnormally high temperature detection (hard protector)
RankA
Trouble detection conditionThe hard protector signal malfunction is detected for a predetermined continuous period of time or more.
Trouble isolation–
Relevant electrical parts-Fusing unit
-Heating roller thermistor/Edg (TH1)
-Heating roller temperature sensor (TEMS)
-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. (Part# ACT9R70100)
  7. Replace CPUB. (Part# ACTAH01003)
  8. Replace BASEB. (Part# ACTAH02014)

(Link to the Field Service Manual)