• 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 is turning.
• Causes: • Ozone fan (FM13) • Printer control board (PRCB)
• Remedy: 1 Check the connector between FM13-relay CN165- 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. <bizhub 454e> The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Toner bottle cooling fan (FM4) • Printer control board (PRCB)
• Remedy: 1 Check the connector between FM4-relay CN111- PRCB CN36 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM4 operation check PRCB CN36-2 (REM) PRCB CN36-3 (LOCK) 26-C 4 Replace FM4 5 PRCB ICP18 conduction check 6 Replace PRCB

• Code: C5358
• Description: Fusing power supply cooling fan’s failure to turn. <bizhub 454e> The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Fusing power supply cooling fan (FM12) • Expansion control board (EXCB) • Printer control board (PRCB)
• Remedy: 1 Check the connector between FM12-EXCB CN6 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM12 operation check EXCB CN6-1 (REM) EXCB CN6-3 (LOCK) 23-T 4 Replace FM12 5 EXCB ICP1 conduction check 6 Replace EXCB 7 Replace PRCB

• Code: C5370
• Description: Machine rear side cooling fan’s failure to turn. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Machine rside cooling fan (FM3) • MFP board (MFPB)
• 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 PJ26-3 (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.
• Causes: • CPU cooling fan (FM14) • MFP board (MFPB)
• Remedy: 1 Reboot the machine. 2 Check the connector between FM14-MFPB PJ20 for proper connection and correct as necessary. 3 Check the fan for possible overload and correct as necessary. 4 FM14 operation check MFPB PJ20-1 to 2 1-U to V 5 Replace MFPB

• Code: C5501
• Description: AC signal abnormality. <bizhub 454e> The zero cross signal is not input during fusing phase control.
• Causes: • Fusing unit • DC power supply (DCPU) • Printer control board (PRCB)
• 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.
• Causes: Printer control board (PRCB)
• 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: C5603
• Description: Expansion control board communication error. Communication error is detected in expansion control board.
• Causes: • Expansion control board (EXCB) • Front side board (FRB) • PH unit • Printer control board (PRCB)
• Remedy: 1 Reboot the machine. 2 Check the connector between EXCB-PRCB for proper connection and correct as necessary. 3 Check the connector between FRB CN5-PH unit for proper connection and correct as necessary. 4 Check the connector between FRB CN2-PRCB CN8 for proper connection and correct as necessary. 5 Replace EXCB 6 Replace FRB 7 Replace PH unit 8 Replace PRCB