• Code: C4153
• Description: Polygon Motor/Y failure to turn
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4154
• Description: Polygon Motor/K failure to turn
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4551
• Description: Laser malfunction (Cyan)
  • SOS signal is not detected even after the lapse of a given period of time after staring the laser output.
  • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4552
• Description: Laser malfunction (Magenta)
  • SOS signal is not detected even after the lapse of a given period of time after staring the laser output.
  • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4553
• Description: Laser malfunction (Yellow)
  • SOS signal is not detected even after the lapse of a given period of time after staring the laser output.
  • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4554
• Description: Laser malfunction (Black)
  • SOS signal is not detected even after the lapse of a given period of time after staring the laser output.
  • SOS signal is not detected for a given period of time during printing or IDC sensor adjustment.
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH Unit. 3 Change PWB-D. 4 Change PWB-M.

• Code: C4705
• Description: Image Output Time Out
  • No image data is output from the MFP Control Board (PWB-MFP).
• Remedy: 1 Select [Service Mode] - [State Confirmation] - [Memory/HDD Adj.] - [Memory Bus Check] - [Memory - PRT]. 2 Check the connectors on PWB-MFP for proper connection and correct as necessary. 3 Change PWB-MFP

• Code: C4761
• Description: Compression hardware timeout
  • The hardware involved with the compression function offered by the MFP Control Board (PWBMFP) does not respond.
• Remedy: 1 When the error is displayed after the memory check, remove and insert the DIMM0 and DIMM1 again to recheck (C4765). 2 Change PWB-MFPnge PWB-M