• 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 PHICB. 4 Change MFPB.

• 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 PHICB. 4 Change MFPB.

• Code: C4552
• Description: Laser malfunction (magenta)
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH unit. 3 Change PHICB. 4 Change MFPB.

• Code: C4553
• Description: Laser malfunction (yellow)
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH unit. 3 Change PHICB. 4 Change MFPB.

• Code: C4554
• Description: Laser malfunction (black)
• Remedy: 1 Check the connector for proper connection and correct as necessary. 2 Change PH unit. 3 Change PHICB. 4 Change MFPB.

• Code: C4705
• Description: Image output time out
  • No image data is output from the printer control board (PRCB).
• Remedy: 1 Select [Service Mode] - [State Confirmation] - [Memory/HDD Adj.] - [Memory Bus Check] - [Memory-PRT], and conduct the memory bus check function. 2 Check the connectors on PRCB for proper connection and correct as necessary. 3 Change PRCB

• Code: C4761
• Description: Compression hardware timeout
  • The hardware involved with the compression function offered by the printer control board (PRCB) 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 PRCB.

• Code: C4765
• Description: Extraction hardware timeout
  • The hardware involved with the extraction function offered by the printer control board (PRCB) 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 PRCB.