C3731 (bizhub 950i/850i)

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Trouble typeC3731: Fusing abnormally high temperature detection (hard protector)
RankA
Trouble detection conditionThe hard protector signal high temperature malfunction is detected.
Trouble isolation–
Relevant electrical parts– Fusing unit
– Heating roller thermistor/Edg (TH1)
– Heating roller thermistor/Ctr (TH2)
– Heating roller temperature sensor/2 (RD2)
– 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)