• Code: F2-50
• Description: K drum phase sensor trouble
• Causes: Drum phase sensor trouble. Harness and connector connection trouble. Drum drive section trouble. PCU PWB trouble
• Remedy: Use SIM30-1 to check the operation of "DHPD_K.". Replace the drum phase sensor. Check connection of the connectors and the harness. Repair the drum drive section. Replace the PCU PWB.

• Code: F2-51
• Description: CL drum phase sensor trouble
• Causes: Drum phase sensor trouble. (DHPCL) Harness and connector connection trouble. Drum drive section trouble. PCU PWB trouble.
• Remedy: Use SIM30-1 to check the operation of "DHPD_CL". Replace the drum phase sensor. Check connection of the connectors and the harness. Repair the drum drive section. Replace the PCU PWB.

• Code: F2-58
• Description: Process humidity sensor trouble
• Causes: Process humidity sensor trouble. Harness and connector connection trouble. PCU PWB trouble.
• Remedy: Replace the process humidity sensor. Check connection of the connectors and the harness. Replace the PCU PWB.

• Code: F2-64
• Description: Toner supply operation trouble (BK)
• 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/harness trouble. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.

• Code: F2-65
• Description: Toner supply operation trouble (C)
• 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/harness trouble. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.

• Code: F2-66
• Description: Toner supply operation trouble (M)
• 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/harness trouble. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.

• Code: F2-67
• Description: Toner supply operation trouble (Y)
• 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/harness trouble. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.

• Code: F2-70
• Description: Improper toner cartridge detection (BLACK)
• 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.