• Code: C5370
• Description: MFP control board cooling fan's failure to turn
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan remains stationary.
• Causes: • MFP control board cooling fan (FM17) • MFP board (MFPB)
• Remedy: 1 Check the connector between FM17-MFPB PJ26 for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 FM17 operation check MFPB PJ26-3 (LOCK) 21-O. 4 Replace FM17. 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 (FM104) • MFP board (MFPB)
• Remedy: 1 Reboot the machine. 2 Check the connector between FM104-MFPB PJ20 for proper connection and correct as necessary. 3 Check the fan for possible overload and correct as necessary. 4 FM104 operation check MFPB PJ20 17-S. 5 Replace FM104. 6 Replace MFPB.

• Code: C5601
• Description: Engine control error
  The port monitor control detects engine control error.
• Causes: Printer control board (PRCB)
• Remedy: 1 Check the connectors of the printer control board (PRCB) for proper connection, and correct as necessary. 2 Rewrite the firmware. 3 Replace PRCB.

• Code: C6102
• Description: Drive system home sensor malfunction
  • The scanner home sensor is unable to detect the scanner located at its home position. • The scanner home sensor is unable to detect a scanner even when the scanner motor has been driven to move the scanner over the maximum travelling distance. • The scanner home sensor detects the scanner when the scanner has moved the maximum travelling distance from the position, at which it blocks the scanner home sensor.
• Causes: • Scanner home sensor (PS201) • Scanner motor (M201) • Scanner drive board (SCDB) • MFP board (MFPB)
• Remedy: 1 Correct or change the scanner drive (pulley, gear, belt) if it is faulty. 2 Correct the scanner motor set screw if loose. 3 Adjust [Image Position Leading Edge] and [Feed Direction Adjustment]. 4 Check the PS201, M201, SCDB and MFPB connector for proper connection and correct as necessary. 5 PS201 I/O check, sensor check SCDB PJ6-3 (ON) 17-V. 6 M201 operation check SCDB PJ4-1 to 7 17-V. 7 Replace SCDB. 8 Replace MFPB.

• Code: C6103
• Description: Slider over running
  The scanner home sensor detects the scanner at its home position during a period of time that begins with the time when a pre-scan command and a scan preparation command are executed and ends when a home return command is executed.
• Causes: • Scanner home sensor (PS201) • Scanner motor (M201) • Scanner drive board (SCDB) • MFP board (MFPB)
• Remedy: 1 Correct or change the scanner drive (pulley, gear, belt) if it is faulty. 2 Correct the scanner motor set screw if loose. 3 Adjust [Image Position Leading Edge] and [Feed Direction Adjustment]. 4 Check the PS201, M201, SCDB and MFPB connector for proper connection and correct as necessary. 5 PS201 I/O check, sensor check SCDB PJ6-3 (ON) 17-V. 6 M201 operation check SCDB PJ4-1 to 7 17-V. 7 Replace SCDB. 8 Replace MFPB.

• Code: C6104
• Description: Back side cleaning home sensor abnormality (initial)
  • The back side cleaning home sensor (PS9) does not change from H to L even after the lapse of a given period of time after the home position detecting operation is started at the initial operation. • The back side cleaning home sensor (PS9) does not change from L to H even after the lapse of a given period of time after the home position detecting operation is started at the initial operation.
• Causes: • Back side cleaning home sensor (PS9) • Back side cleaning motor (M7) • DF control board (DFCB)
• Remedy: 1 Check the connector between M7-relay CN119-DFCB CN6 for proper connection, and correct as necessary. 2 Check the connector of M7 for proper drive coupling, and correct as necessary. 3 PS9 I/O check, sensor check DFCB CN3-11 (ON) DF-702 6-C. 4 M7 operation check DFCB CN6-5 to 8 DF-702 7-C. 5 Replace M7. 6 DFCB ICP4 conduction check. 7 Replace DFCB.

• Code: C6105
• Description: Back side cleaning home sensor abnormality (normal)
  At the time of operation other than the initial operation, the back side cleaning home sensor (PS9) error is detected.
• Causes: • Back side cleaning home sensor (PS9) • Back side cleaning motor (M7) • DF control board (DFCB)
• Remedy: 1 Check the connector between M7-relay CN119-DFCB CN6 for proper connection, and correct as necessary. 2 Check the connector of M7 for proper drive coupling, and correct as necessary. 3 PS9 I/O check, sensor check DFCB CN3-11 (ON) DF-702 6-C. 4 M7 operation check DFCB CN6-5 to 8 DF-702 7-C. 5 Replace M7. 6 DFCB ICP4 conduction check. 7 Replace DFCB.

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