• Code: 5501-126.02
• Description: AC signal abnormality
  No line frequency detected.
• Causes: Power supply unit (PU)
• Remedy: 1 Check the power cord for continuity. Replace if necessary. 2 Make sure the nominal voltage source is within specification. Low-voltage models: 100 to 127 V AC High-voltage models: 220 to 240 V AC 3 Check if the power supply cable is properly connected to the CTLB. Reseat the cables if any abnormality is found 4 Measure the resistance between terminals A and D of the power supply socket. 1. Turn off the printer. 2. Remove the power cord. 3. Measure the resistance between terminals A and D of the power supply socket. 4. Is the resistance approximately 30 ohms? 5 Replace the PU if any abnormality is found in the measured resistance.

• Code: 5601-912.xx
• Description: Engine control malfunction
  Unrecoverable Engine firmware error.
• Causes: Controller board (CTLB)
• Remedy: 1 Check the connectors on CTLB for proper connection and correct or change as necessary. 2 Rewrite the firmware. 3 Replace CTLB.

• Code: 5601-98x.xx
• Description: Engine control malfunction
  Engine experiencing unreliable communication with the specified device. Engine protocol violation detected by the specified device. Communications error detected by the specified device. Invalid command received by the specified device. Invalid command parameter received by the specified device.
• Causes: Controller board (CTLB)
• Remedy: 1 Turn OFF/ON the main power switch. 2 Rewrite the firmware. 3 Replace CTLB. 4 If the above actions do not solve the problem, contact KM.

• 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 • Controller board (CTLB)
• Remedy: 1 Check the connector between scanner unit-CTLB J101 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 CTLB

• 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 • Controller board (CTLB)
• Remedy: 1 Check the connector between scanner unit- CTLB J101 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 CTLB

• 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 • Controller board (CTLB)
• Remedy: 1 Check the connector between scanner unit- CTLB J101 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 CTLB

• Code: 6792
• Description: White reference plate search error
  The black/white edge on the shading plate cannot be detected during initialization.
• Causes: • Scanner unit • Controller board (CTLB)
• Remedy: 1 Check the connector between scanner unit- CTLB J101 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 CTLB

• Code: 6793
• Description: Scanner communication error
  A communication error of some sort occurs between the controller and the scanner.
• Causes: • Scanner unit • Controller board (CTLB)
• Remedy: 1 Check the connector between scanner unit- CTLB J101 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 CTLB