• Code: 5357
• Description: Cooling fan motor/1 failurening.
  The fan lock signal remains HIGH for a predetermined continuous period of time while the fan is turning.
• Causes: • Cooling fan motor/1 (FM2) • Printer control board (PRCB)
• Remedy: 1 Check the connector between FM2-relay CN303- PRCB CN3 for proper connection and correct as necessary. - - 2 Check the fan for possible overload and correct as necessary. - - 3 FM2 operation check PRCB CN3-7 (OUT) PRCB CN3-9 (LOCK) 7-L 4 Replace FM2 - - 5 PRCB F2 conduction check - - 6 Replace PRCB

• Code: 5501
• Description: AC signal abnormality
  The zero cross signal is not input during fusing phase control.
• Causes: • Fusing unit • DC power supply (DCPS) • Printer control board (PRCB)
• Remedy: 1 Check the fusing unit for correct installation (whether it is secured in position). - - 2 Check the fusing unit-PRCB CN15, DCPS CN2 for proper connection and correct or change as necessary - - 3 Replace fusing unit - - 4 Replace PRCB - - 5 Replace DCPS

• Code: 5601
• 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: 5701
• Description: Power supply malfunction
  A condition is detected in which no power is being supplied to the printer control board (PRCB).
• Causes: • PH unit • Toner supply motor/YM (M5) • Toner supply motor/CK (M6) • Front door switch (SW2) • Right door switch (SW3) • DC power supply (DCPS) • Printer control board (PRCB)
• Remedy: 1 Check the connector between SW2, SW3-DCPS CN10 for proper connection and correct as necessary. - - 2 Check the connector between M5, M6-PRCB CN22 for proper connection and correct as necessary. - - 3 Check the connector between PH unit-relay CN73- PRCB CN5 for proper connection and correct as necessary. - - 4 M5, M6 operation check PRCB CN22-1 to 4 (M5) PRCB CN22-5 to 8 (M6) 7-I 7-K 5 SW2, SW3 operation check DCPS CN10-1 to 3 1-F 6 Replace the PH unit - - 7 Replace DCPS - - 8 PRCB F5, F10 conduction check - - 9 Replace PRCB

• Code: 6751
• 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 CN102, 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 Correct reflective mirror of the scanner if faulty, or change scanner mirror. - - 5 Replace scanner unit - - 6 Replace MFPB

• Code: 6790
• Description: AFE offset adjustment error
  During the offset adjustment, the offset value does not fall within the predetermined range a total of three times including retries.
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1 Check the connector between scanner unit-MFPB CN102, 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 Correct reflective mirror of the scanner if faulty, or change scanner mirror. - - 5 Replace scanner unit - - 6 Replace MFPB

• Code: 6791
• Description: AFE register setting error
  There is a mismatch between the set default values of the AFE gain/offset and the gain/offset values read thereafter.
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1 Check the connector between scanner unit-MFPB CN102, 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 Correct reflective mirror of the scanner if faulty, or change scanner mirror. - - 5 Replace scanner unit - - 6 Replace MFPB

• Code: 6792
• Description: White reference plate search error
  The black/white edge on the shading plate cannot be detected during initialization.
• Causes: • Scanner unit • MFP board (MFPB)
• Remedy: 1 Check the connector between scanner unit-MFPB CN102, 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 Correct reflective mirror of the scanner if faulty, or change scanner mirror. - - 5 Replace scanner unit - - 6 Replace MFPB