C392B (bizhub 958/808)

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Trouble typeC392B: Fusing disconnection error detection (difference of temperature)
RankA
Trouble detection conditionbizhub 958, bizhub PRO 958:
The difference between the temperature corrected by the fusing belt thermistor/1 (TH1) and the temperature detected by the fusing belt temperature sensor/1 (TEMS1) exceeds a predetermined value after warm up.
Trouble isolation– bizhub 808/758:
The difference between the temperature corrected by the heating roller thermistor/1 (TH1) and the temperature detected by the heating roller temperature sensor/1 (TEMS1) exceeds a predetermined value after warm up.
Relevant electrical parts• Fusing unit
• Fusing belt temperature sensor/1 (TEMS1) (bizhub 958, bizhub PRO 958)
• Heating roller temperature sensor/1 (TEMS1) (bizhub 808/758)
• Fusing belt thermistor/1 (TH1) (bizhub 958, bizhub PRO 958)
• Heating roller thermostat/1 (TH1) (bizhub 808/758)
• IH power supply unit (IHPU)
• Noise filter (NF1)
• MFP board (MFPB)

 Procedure

  1. Check the fusing unit for correct installation (whether it is secured in position).
  2. Check the open/close operation of the upper right door.
  3. Check the fusing unit-MFPB CN30E for proper connection and correct or change as necessary.
  4. Check the connector between TEMS1-relay CN512-MFPB CN29E for proper connection and correct as necessary.
  5. Check the connector between NF1 CN2-IHPU CN1 for proper connection and correct as necessary.
  6. Check the connector between IHPU CN8-MFPB CN18E for proper connection and correct as necessary.
  7. Replace the fusing unit. ( 958)A796R71422 )( 808)A795R72922 )
  8. Replace IHPU. (958)( A796M40B00 )(808)( A8KNM40A02 )
  9. Replace MFPB. ( A796H02003)
  10. Replace NF1. (958)( A796M40H00 )(808)( A795M40J00 )

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

(Link to the Field Service Manual) K.3.9.21.