• Code: F2-64
• Description: Toner supply operation trouble
• Causes: Toner motor trouble. Toner density sensor trouble. Connector/harness trouble. PCU PWB trouble. Toner cartridge trouble. Developing unit trouble.
• Remedy: Replace the toner motor. Replace the toner density sensor. Connector and harness check. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.

• 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/harness trouble.

• Code: F2-78
• Description: Image density sensor trouble
• Causes: Image density sensor trouble. Harness connection trouble between the PCU PWB and the image density sensor. Image density sensor dirt. Calibration plate dirt. Calibration plate solenoid operation trouble.
• Remedy: Replace the image density sensor. Check connection of the connectors and the harness. Replace the image density sensor. Calibration plate solenoid operation 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: H2-00
• Description: Thermistor open trouble (TH_UM_AD2)
• 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. Harness and connector connection trouble.

• Code: H2-01
• Description: Thermistor open trouble (TH_LM)
• 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. Harness and connector connection trouble.

• Code: H2-02
• Description: Sub 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. Harness and connector connection trouble.