• Code: F2-70
• Description: Improper toner cartridge detection
• Causes: An improper toner cartridge is inserted. (The main unit detects a toner cartridge of a different specification.) Toner cartridge trouble. PCU PWB trouble
• Remedy: Replace the toner cartridge. Replace the PCU PWB.

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

• Code: F3-12
• Description: Paper feed tray 1 lift operation trouble
• Causes: LUD1 is not turned ON within the specified time. CLUD1 sensor trouble Paper feed tray 1 lift unit trouble. PCU PWB trouble. Harness and connector connection trouble.
• Remedy: Check connection of the harness and the connector of LUD1. Replace the lift-up unit. Replace the PCU PWB.

• Code: F3-22
• Description: Paper feed tray 2 lift operation trouble
  LUD2 does not turn ON within the specified time.
• Causes: LUD2 does not turn ON within the specified time. CLUD2 sensor trouble. Paper feed tray 2 lift unit trouble. PCU PWB trouble. Harness and connector connection trouble.
• Remedy: Check the harness and the connector of LUD2. Replace the lift-up unit. Replace the PCU PWB.

• Code: F6-00
• Description: MFP-FAX communication trouble
  Communication establishment error/Framing/Parity/ Protocol error
• Causes: FAX unit PWB connector connection error FAX unit PWB - MFPcnt PWB harness trouble FAX unit PWB mother board connector pin breakage FAX unit ROM trouble/ROM pin breakage
• Remedy: Case 1 Cause FAX unit PWB connector connection error Check and remedy Check the connector connection between the FAX unit PWB and the MFPcnt PWB. Case 2 Cause FAX unit PWB - MFPcnt PWB harness trouble Check and remedy Check the connector harness between the FAX unit PWB and the MFPcnt PWB. Case 3 Cause FAX unit PWB mother board connector pin breakage Check and remedy Check the machine grounding. Case 4 Cause FAX unit ROM trouble/ROM pin breakage Check and remedy Check the FAX unit PWB ROM.

• Code: F6-01
• Description: FAX board EEPROM read/write error
  EEPROM access error (read/write)
• Causes: EEPROM trouble FAX PWB EEPROM access circuit trouble
• Remedy: Case 1 Cause EEPROM trouble Check and remedy Check that no trouble occurs after replacement of EEPROM. Execute the memory check of SIM66-3 to insure that EEPROM can be accessed. Case 2 Cause FAX PWB EEPROM access circuit trouble Check and remedy Replace the PWB. In this case, not need to execute the simulation.

• Code: F6-04
• Description: FAX MODEM operation trouble
  FAX PWB MODEM chip operation trouble
• Causes: FAX PWB MODEM chip operation trouble
  The FAX PWB MODEM chip cannot be accessed.
• Remedy: Case 1 Cause FAX PWB MODEM chip operation trouble Check and remedy Replace the FAX PWB MODEM chip. Case 2 Cause The FAX PWB MODEM chip cannot be accessed. Check and remedy Replace the FAX PWB

• Code: F6-21
• Description: Combination error between the TEL/LIU PWB and the FAX soft switch
  Combination error between the TEL/LIU PWB and the FAX PWB information (soft switch)
• Causes: The destination of the installed TEL/LIU PWB differs. The FAX PWB information (soft switch) differs. TEL/LIU PWB trouble
• Remedy: Case 1 Cause The destination of the installed TEL/LIU PWB differs. Check and remedy Check the destination of the installed TEL/LIU PWB. Case 2 Cause The FAX PWB information (soft switch) differs. Check and remedy Check the FAX PWB information (soft switch). Case 3 Cause TEL/LIU PWB trouble Check and remedy Replace the TEL/LIU PWB.