• Code: F6-30
• Description: Access error to 1-chip microprocessor on the FAX board (FAX detection)
  Access error (read/write) to 1-chip microprocessor on the FAX board
• Causes: Program writing error (or no writing) to the 1-chip microprocessor 1-chip microprocessor trouble FAX PWB 1-chip microprocessor access circuit trouble
• Remedy: Case 1 Cause Program writing error (or no writing) to the 1-chip microprocessor Check and remedy Use SIM66-24 to rewrite the 1-chip microprocessor program. Case 2 Cause 1-chip microprocessor trouble Check and remedy Replace the 1-chip microprocessor chip. When replacing, use SIM66-42 to rewrite the 1-chip microprocessor program. Case 3 Cause FAX PWB 1-chip microprocessor access circuit trouble Check and remedy Replace the FAX PWB.

• Code: F6-97
• Description: The FAX PWB does not match with the machine model. The FAX PWB identification model does not match with the machine model.
• Causes: An improper type of FAX PWB is installed to the machine.
• Remedy: Replace the FAX PWB with a proper one.

• Code: F6-98
• Description: Combination error between the FAXBOX destination information and the machine destination information.
• Causes: Combination error between the destination information written in EEPROM on the FAX PWB and the destination information of the machine (set with SIM26-6).
• Remedy: 1) Check the destination of the FAX PWB. 2) Check the destination of the machine. (SIM26-6) 3) Use a proper combination of the machine and the FAX PWB.

• Code: H2-00
• Description: Thermistor open trouble (TH_UM)
• Causes: Thermistor trouble. PCU PWB trouble Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermistor. Replace the PCU PWB. Check connection of the connector and the harness.

• Code: H2-02
• Description: Thermistor open trouble (TH_US)
• Causes: Thermistor trouble. PCU PWB trouble. Connection trouble of the connector and the harness. Fusing unit not installed.
• Remedy: Replace the thermistor. Replace the PCU PWB. Check connection of the connector and the harness.

• Code: H3-00
• Description: Fusing section high temperature trouble (TH_UM)
• Causes: The fusing temperature exceeds the specified level. Thermistor trouble. PCU PWB trouble Connection trouble of the fusing section connector and the harness. HL PWB trouble.
• Remedy: 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 connector and the harness. Replace the HL PWB.

• Code: H3-02
• Description: Fusing section high temperature trouble (TH_US)
• Causes: The fusing temperature exceeds the specified level. Thermistor trouble. PCU PWB trouble. HL PWB trouble. Fusing section connector connection trouble. HL PWB trouble.
• Remedy: Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble. Check connection of the thermistor and the harness. Check the PCU PWB thermistor input circuit section. (When the lamp is ON:) Check the HL PWB and the PCU PWB lamp circuit. Replace the thermistor, the HL PWB, and the PCU PWB.

• Code: H4-00
• Description: Fusing section low temperature trouble (TH_UM)
• Causes: The fusing temperature does not reach the specified level within the specified time from turning ON the power relay. Thermistor trouble. Heater lamp trouble. PCU PWB trouble. Thermostat trouble. Connector, harness connection trouble. HL PWB trouble. Interlock switch trouble.
• Remedy: Replace the thermistor. Replace the heater lamp. Replace the PCU PWB. Replace the thermostat. Check connection of the connector and the harness. Replace the HL PWB. Replace the interlock switch. Use SIM5-2 to check the flashing operation of the heater lamp. Use SIM14 to cancel the trouble.