• Code: F2-74
• Description: Toner cartridge CRUM error (BK)
• Causes: Toner cartridge (CRUM) trouble. MFPC PWB trouble. Connector/harness trouble.
• Remedy: Replace the toner cartridge. Replace the MFPC PWB. Connector/harness trouble.

• Code: F2-75
• Description: Toner cartridge CRUM error (C)
• Causes: Toner cartridge (CRUM) trouble. MFPC PWB trouble. Connector/harness trouble.
• Remedy: Replace the toner cartridge. Replace the MFPC PWB. Connector/harness trouble.

• Code: F2-76
• Description: Toner cartridge CRUM error (M)
• Causes: Toner cartridge (CRUM) trouble. MFPC PWB trouble. Connector/harness trouble.
• Remedy: Replace the toner cartridge. Replace the MFPC PWB. Connector/harness trouble.

• Code: F2-77
• Description: Toner cartridge CRUM error (Y)
• Causes: Toner cartridge (CRUM) trouble. MFPC PWB trouble. Connector/harness trouble.
• Remedy: Replace the toner cartridge. Replace the MFPC PWB. Connector/harness trouble.

• Code: F3-22
• Description: Paper feed tray 2 lift operation trouble
• Causes: LUD1 is not turned ON within the specified time. C2LUD1sensor trouble Paper feed tray 2 lift unit trouble. MFPC PWB trouble. Harness and connector connection trouble.
• Remedy: Check connection of the harness and the connector of C2LUD. Replace the lift-up unit. Replace the MFPC PWB.

• Code: F6-00
• Description: Controller - FAX communication trouble
  MFP - FAX communication establishment error / Framing / Parity / Protocol error
• Causes: FAX control PWB trouble. FAX control PWB - MFPC PWB connector and harness trouble. FAX PWB trouble. FAX PWB trouble.
• Remedy: Replace the FAX control PWB. Check the connector and the harness between the FAX control PWB and the MFPC PWB. Check/Replace the FAX PWB (The modem chip is not soldered correctly). Check/Replace the FAX PWB (The modem chip is not soldered correctly)

• Code: F6-04
• Description: FAX MODEM operation trouble.
  FAX control PWB MODEM chip operation trouble
• Causes: FAX MODEM chip operation trouble. The FAX MODEM chip cannot be accessed.
• Remedy: Replace the FAX control PWB. Replace the FAX control PWB.

• Code: F6-21
• Description: Improper combination of FAX PWB and FAX soft switch
  Incompatibility between the FAX PWB and the FAX control PWB information (soft switch)
• Causes: The destination of the FAX PWB installed is improper. FAX PWB trouble.
• Remedy: Check the destination of the FAX PWB. Replace the FAX PWB.