• 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: Case 1 Cause FAX MODEM chip operation trouble. Check and remedy Replace the FAX control PWB. Case 2 Cause The FAX MODEM chip cannot be accessed. Check and Remedy Replace the FAX control PWB.

• Code: F6-21
• Description: Improper combination of TEL/LIU PWB and FAX soft switch
  Incompatibility between the TEL/LIU PWB and the FAX control PWB information (soft switch)
• Causes: The destination of the TEL/LIU PWB installed is improper. TEL/LIU PWB trouble.
• Remedy: Case 1 Cause The destination of the TEL/LIU PWB installed is improper. Check and Remedy Check the destination of the TEL/LIU PWB. Case 2 Cause TEL/LIU PWB trouble. Check and Remedy Replace the TEL/LIU PWB.

• Code: F6-30
• Description: FAX 1-chip microprocessor access error (FAX detection)
  FAX 1-chip microprocessor access error (Read and write)
• Causes: Program writing trouble to the 1-chip microprocessor, or no program data written. FAX 1-chip microprocessor circuit trouble.
• Remedy: Case 1 Cause Program writing trouble to the 1-chip microprocessor, or no program data written. Check and Remedy Use SIM66-42 to rewrite the 1-chip microprocessor program. Case 2 Cause FAX 1-chip microprocessor circuit trouble. Check and Remedy Replace the FAX control PWB.

• Code: F6-97
• Description: Incompatibility between FAX control PWB and the main machine
  Incompatibility between FAX control PWB and the main machine
• Causes: The FAX control PWB installed is improper. FAX control PWB trouble.
• Remedy: Install a proper FAX control PWB. Replace the FAX control PWB.

• Code: F6-98
• Description: Incompatibility between the FAX control PWB destination and the main machine destination Incompatibility between the FAX control PWB destination and the main machine destination
• Causes: Incompatibility between the destination information written into the FAX control PWB EEPROM and that in the main machine (set with SIM26-6)
• Remedy: 1) Check the destination of the FAX control PWB. 2) Check the destination of the machine. (SIM26-6)

• Code: H2-00
• Description: Thermistor open trouble (TH_UM)
  Main thermistor open hardware detection trouble
• Causes: Main thermistor trouble PCU PWB trouble Thermistor connector and harness connection trouble Fusing section connector connection trouble Fusing unit not installed
• Remedy: Use SIM44-14 to check the state of the thermistor. Replace the thermistor. Replace the PCU PWB. Check connection of the thermistor connector and the harness. Check the connector in the fusing section.

• Code: H2-01
• Description: Thermistor open trouble (TH_US)
  Sub thermistor open hardware detection trouble
• Causes: Sub thermistor trouble PCU PWB trouble Thermistor connector and harness connection trouble Fusing section connector connection trouble Fusing unit not installed
• Remedy: Use SIM44-14 to check the state of the thermistor. Replace the thermistor. Replace the PCU PWB. Check connection of the thermistor connector and the harness. Check the connector in the fusing section.

• Code: H3-00
• Description: Fusing section high temperature trouble (TH_UM)
  Main heater lamp abnormally high temperature software detection trouble
• Causes: The fusing temperature exceeds the specified level. Main thermistor trouble PCU PWB trouble Thermistor connector and harness connection trouble Power unit trouble.
• Remedy: Use SIM44-14 to check the state of the thermistor. Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble. Replace the thermistor. Replace the PCU PWB. Check connection of the thermistor connector and the harness. Replace the power unit.