C392A (bizhub C759/C659)

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Trouble typeC392A: Fusing belt temperature sensor/1 contamination (Middle of the heating roller)
RankC
Trouble detection conditionDuring waiting after a predetermined period of time after the warm-up stage terminates, the temperature detected by the heating roller thermostat (TH1) exceeds that detected by the heating roller temperature sensor/1 (TEMS1) above a predetermined temperature, and this state continues for a predetermined period of time.
Trouble isolation–
Relevant electrical parts-Fusing unit
-Heating roller temperature sensor/1 (TEMS1)
-Heating roller thermistor/1 (TH1)
-MFP board (MFPB)

 Procedure

  1. Wipe the TEMS1 clean of dirt if any.
    • Clear away a dirt or a foreign object on the sensor with a cotton swab.
    • When a dirt is left even if you cleaned the sensor by above procedure, clear away a dirt or a foreign object on the sensor using a cotton swab dampened with the alcohol. And, wipe off the sensor with a dry cotton swab afterwards.
  2. Check the TEMS1 for installed position and proper connector connection.
  3. Check the connection of the fusing unit.
  4. Check the connector between the fusing unit-relay CN261-MFPB CN21E for proper connection and correct or change as necessary.
  5. Replace the fusing unit. (Part# A8JER70222)
  6. MFPB F3E conduction check
  7. Replace MFPB. (Part# A8JEH02002)

L.3.10.14 (Link to the Field Service Manual)