• Code: F2-52
• Description: CL drum phase sensor trouble (MAGENTA) (51cpm machine)
• 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_C", "DHPD_M", "DHPD_Y". Replace the drum phase sensor. Check connection of the connectors and the harness. Repair the drum drive section. Replace the PCU PWB.

• Code: F2-53
• Description: CL drum phase sensor trouble (YELLOW) (51cpm machine)
• 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_C", "DHPD_M", "DHPD_Y". 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: Temperature/humidity sensor trouble (HUD_M/TH_M)
• Causes: Temperature/humidity sensor trouble. Process humidity sensor harness and connector connection trouble PCU PWB trouble.
• Remedy: Replace the temperature/humidity sensor. Check connection of the temperature/humidity sensor harness and the connector. Replace the PCU PWB.

• Code: F2-64
• Description: Toner supply operation trouble (K)
• Causes: Toner motor trouble. Toner density sensor trouble. Connector/harness trouble. PCU PWB trouble. Toner cartridge trouble. Developing unit trouble. Toner transport pipe section 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. Check the toner transport pipe section.

• Code: F2-65
• Description: Toner supply operation trouble (C)
• Causes: Toner density sensor trouble. Connector/harness trouble. PCU PWB trouble. Toner cartridge trouble. Developing unit trouble. Toner transport pipe section 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. Check the toner transport pipe section.

• 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. Toner transport pipe section troubl
• 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. Check the toner transport pipe section.

• 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. Toner transport pipe section 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. Check the toner transport pipe section.

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