• Code: C5351
• Description: Power supply cooling fan motor’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan remains stationary.
• Remedy: 1 Check the connector between FM1-relay CN26-PRCB CN18 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM1 operation check PRCB CN18-13 (REM) PRCB CN18-15 (LOCK) 6-C. 4 Replace FM1. 5 PRCB ICP2 conduction check. 6 Replace PRCB.

• Code: C5354
• Description: Ozone fan’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan remains stationary.
• Remedy: 1 Check the connector between FM13-relay CN158- PRCB CN23 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM13 operation check PRCB CN23-10 (REM) PRCB CN23-12 (LOCK) 5-C. 4 Replace FM13. 5 PRCB ICP19 conduction check. 6 Replace PRCB.

• Code: C5355
• Description: Toner bottle cooling fan’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan remains stationary.
• Remedy: 1 Check the connector between FM4-relay CN157- PRCB CN34 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM4 operation check PRCB CN34-1 (REM) PRCB CN34-3 (LOCK) 27-C. 4 Replace FM4. 5 PRCB ICP18 conduction check. 6 Replace PRCB.

• Code: C5370
• Description: Rear side cooling fan’s failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan remains stationary.
• Remedy: 1 Check the connector between FM3-MFPB PJ26 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM3 operation check MFPB PJ26 (LOCK) 7-P. 4 Replace FM3. 5 Replace MFPB.

• Code: C5372
• Description: MFP control board CPU temperature failure
  Temperature failure of CPU on the MFP board was detected.
• Remedy: 1 Reboot the machine. 2 Check the fan connector for proper connection and correct as necessary. 3 Check the fan for possible overload and correct as necessary. 4 Fan motor operation check. 5 Replace MFPB.

• Code: C5501
• Description: AC signal abnormality
  The zero cross signal is not input during fusing phase control.
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 3 Replace fusing unit. 4 Replace PRCB. 5 Replace DCPU.

• Code: C5601
• Description: Engine control malfunction
  Engine control malfunction is detected with port monitor control.
• Remedy: 1 Check the connectors on the PRCB for proper connection and correct or change as necessary. 2 Rewrite the firmware. 3 Replace PRCB.

• Code: C6001
• Description: DF related configuration error 1
  Inconsistency in the configuration with the installed DF is detected on the main body.
• Remedy: 1 Check the type of the installed DF and replace it if it is a wrong one. 2 Check to see if the correct firmware is installed and rewrite with the correct one as necessary. 3 Correct the harness connection between DFCB and DSIPB if faulty. 4 Correct the harness connection between DSIPB and MFPB if faulty. 5 Replace DFCB. 6 Replace DSIPB. 7 Replace MFPB.