C4501 (bizhub 558/458)

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Trouble typeC4501: Laser malfunction
RankB
Trouble detection condition• SOS 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 parts• PH unit
• MFP board (MFPB)

 Procedure

  1. Check the connector between the PH unit-relay CN63-MFPB CN20E for proper connection and correct as necessary.
  2. Replace the PH unit. (558 Part# A9HGR70400 / 458 Part# A9HHR70000)
  3. Replace MFPB. (558 Part# A9HGH02102 / 458 Part# A9HHH02102)

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

K.3.15.3 (Link to the Field Service Manual)