C4501(bizhub 958/808)

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Trouble typeC4501: Laser malfunction
RankB
Trouble detection conditionSOS signal is not detected even after the lapse of a given period of time after starting the laser output.SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
Trouble isolation–
Relevant electrical partsPH unitPH relay board (PHRYB)MFP board (MFPB)

 Procedure

  1. Check the connector between the PH unit-PHRYB CN8 for proper connection and correct as necessary.
  2. Replace the PH unit. (Part# A796R70500)
  3. PHRYB IC5 conduction check.
  4. Replace PHRYB. (Part# A796H00300)
  5. Replace MFPB. (Part# A796H02003)

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

K.3.10.5 (Link to the Field Service Manual)