• Code: C5354
• Description: Paper exit cooling fan failure to turn. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Paper exit cooling fan (FM3) • MFP board (MFPB)
• Remedy: 1. Check the connector between FM3-MFPB CN41E for proper connection and correct as necessary. 2. Check the fan for possible overload and correct as necessary. 3. FM3 operation check. • Control signal: MFPB CN41E-1 (REM), MFPB CN41E-3 (LOCK) • Location of electrical component: 12-I 4. Replace FM3. 5. MFPB F7E conduction check 6. Replace MFPB.

• Code: C5356
• Description: Main cooling fan failure to turn. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Main cooling fan (FM2) • MFP board (MFPB)
• Remedy: 1. Check the connector between FM2-relay CN21-relay CN27-MFPB CN29E for proper connection and correct as necessary. 2. Check the fan for possible overload and correct as necessary. 3. FM2 operation check • Control signal: MFPB CN29E-6 (REM), MFPB CN29E-8 (LOCK) • Location of electrical component: 20-C 4. Replace FM2. 5. MFPB F12E conduction check 6. Replace MFPB.

• Code: C5359
• Description: Reverse cooling fan failure to turn. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Reverse cooling fan (FM5) • MFP board (MFPB)
• Remedy: 1. Check the connector between FM5-relay CN88-relay CN20-MFPB CN25E for proper connection and correct as necessary. 2. Check the fan for possible overload and correct as necessary. 3. FM5 operation check. • Control signal: MFPB CN25E-11 (REM), MFPB CN25E-13 (LOCK) • Location of electrical component: 18-C 4. Replace FM5. 5. Replace MFPB.

• Code: C5370
• Description: Power supply cooling fan failure to turn. The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Power supply cooling fan (FM1) • MFP board (MFPB)
• Remedy: 1. Check the connector betweenFM1-relay CN45-MFPB CN15E for proper connection and correct as necessary. 2. Check the fan for possible overload and correct as necessary. 3. FM1 operation check • Control signal: MFPB CN15E-4 (REM), MFPB CN15E-6 (LOCK) • Location of electrical component: 17-C 4. Replace FM1. 5. MFPB F7E conduction check 6. Replace MFPB.

• Code: C5372
• Description: MFP control board CPU temperature failure. Temperature failure of CPU on the MFP board was detected.
• Causes: MFP board (MFPB)
• Remedy: 1. Reboot the machine. 2. Check for clogging in the ventilation path between the MFPB and the power supply cooling fan, and correct as necessary. 3. Replace MFPB.

• Code: C5501
• Description: AC signal abnormality. The zero cross signal is not input during fusing phase control.
• Causes: • Fusing unit • DC power supply (DCPU) • MFP board (MFPB)
• Remedy: 1. Check the fusing unit for correct installation (whether it is secured in position). 2. Check the fusing unit-DCPU CN2 for proper connection and correct or change as necessary. 3. Check the connector between DCPU CN7-MFPB CN2E for proper connection and correct as necessary. 4. Replace the fusing unit. 5. MFPB F1E conduction check 6. Replace MFPB. 7. Replace DCPU.

• Code: C5601
• Description: Engine control malfunction. Engine control malfunction is detected with port monitor control.
• Causes: MFP board (MFPB)
• Remedy: 1. Check the connectors on MFPB for proper connection and correct as necessary. 2. Rewrite the firmware. 3. Replace MFPB.

• Code: C5605
• Description: Engine communication data error. A communication error is detected between CPUs.
• Causes: MFP board (MFPB)
• Remedy: 1. Turn OFF the main power switch, disconnect and then connect the power cord. Wait for 10 sec. or more after connect the power cord, and turn ON the main power switch. 2. Rewrite the firmware. 3. Replace MFPB.