• 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 the MFPB for proper connection and correct or change as necessary. 2. Rewrite the firmware. 3. Replace MFPB.

• Code: C5605, C5606
• Description: • C5605: Engine communication data error • C5606: Engine transmission timeout. Trouble detection condition 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.

• Code: C5610, C5611
• Description: • C5610: PH LD drive communication error • C5611: PH EEPROM communication error. Trouble detection condition • C5610: LD drive write data and read data disagree with each other a predetermined number of consecutive times. • C5611: The two-time readout data of PH unit EEPROM data keeps mismatched for a predetermined number of consecutive times.
• Causes: • PH unit • MFP board (MFPB)
• Remedy: 1. Reboot the machine. 2. Check the connector between PH unit-relay CN73-MFPB CN21E for proper connection and correct as necessary. 3. Replace the PH unit. (bizhub C3851/C3351 / bizhub C3851FS) 4. Replace MFPB.

• Code: C5701
• Description: Power supply malfunction A condition is detected in which no power is being supplied to the MFP board (MFPB).
• Causes: • PH unit • Front door switch (SW2) • Right door switch (SW3) • DC power supply (DCPS) • MFP board (MFPB)
• Remedy: 1. Check the connector between SW2, SW3-DCPS CN10 for proper connection and correct as necessary. 2. Check the connector between PH unit-relay CN73-MFPB CN21E for proper connection and correct as necessary. 3. SW2, SW3 operation check • Control signal: DCPS CN10-1 to 3 • Location of electrical component: 18-W 4. Replace the PH unit. (bizhub C3851/C3351 / bizhub C3851FS) 5. Replace DCPS. 6. MFPB F5E, F10E conduction check 7. Replace MFPB.

• Code: C6001, C6002
• Description: • C6001: DF related configuration error 1 • C6002: DF related configuration error 2. Inconsistency in the configuration with the installed DF is detected on the main body.
• Causes: • DF drive board (DFDB) • MFP board (MFPB)
• Remedy: 1. Check the type of the installed DF and replace it if it is a wrong one. 2. Check the connector between DFDB J1-MFPB CN800E for proper connection and correct as necessary. 3. Replace DFDB. 4. Replace MFPB.

• Code: C6704
• Description: Image input time out Image data is not input from the scanner to the MFP board (MFPB).
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1. Select [Service Mode] -> [State Confirmation] -> [Memory/Storage Adjustment] -> [Memory Bus Check] -> [Scanner -> Memory], and conduct the memory bus function. 2. Check the connector between the scanner unit-MFPB CN23, CN103 for proper connection and correct as necessary. 3. Replace the scanner unit. 4. Replace MFPB.

• Code: C6751
• Description: CCD clamp/gain adjustment failure. During the CCD gain adjustment, a condition in which the peak value of the output data is equal to, or less than, 64 occurs three consecutive times during retries.
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1. Check the connector between scanner unit-MFPB CN23, CN103 for proper connection and correct as necessary. 2. Check for possible extraneous light and correct as necessary. 3. Clean the lens, mirrors, CCD surface, and shading sheet if dirty. 4. Replace the scanner unit. 5. Replace MFPB.

• Code: C6752
• Description: ASIC clock input error (front side) When starting the machine, verification on reading and writing the predetermined value for image processing ASIC on CCD board (CCDB) was conducted, and verification failure was detected.
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1. Replace the scanner unit. 2. Replace MFPB.