• Code: F1-52
• Description: Finisher micro switch trouble
• Causes: Finisher control PWB trouble. Each micro switch trouble. Harness and connector connection trouble.
• Remedy: Use SIM3-2 to check the operations of the front door/ upper door open detection and the oscillation guide close detection. Check connection from the control PWB to the sensor. Replace the control PWB. Replace the sensor.

• Code: F2-22
• Description: Discharge lamp trouble
• Causes: Contact trouble between the discharge lamp PWB and the PCU PWB. Discharge lamp PWB trouble. PCU PWB trouble.
• Remedy: Replace the discharge lamp PWB. Check the harness and connector. Replace the PCU PWB.

• Code: F2-39
• Description: Process thermistor trouble
• Causes: Process thermistor trouble. Process thermistor harness connection trouble. PCU PWB trouble
• Remedy: Replace the process thermistor. Check connection of the harness and the connector. Replace the PCU PWB.

• Code: F2-40
• Description: Toner density sensor trouble.?
• Causes: Toner density sensor output abnormality (Sample level 35 or less, or 220 or above) Connection trouble of the connector and the harness. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Check connection of the connector and the harness. Replace the developing unit. Replace the PCU PWB.

• Code: F2-45
• Description: Image density sensor troubles
• Causes: Image density sensor trouble. Sensor harness and connector connection trouble. Image density sensor dirt. PCU PWB trouble.
• Remedy: Replace the image density sensor . Check connection of the sensor harness and connector. Clean the image density sensor. Replace the PCU PWB.

• Code: F2-50
• Description: Drum phase sensor trouble
• Causes: Drum phase sensor trouble. Drum phase sensor harness and connector connection trouble. Drum drive section trouble. PCU PWB trouble.
• Remedy: Replace the drum phase sensor. Check connection of the drum phase sensor harness and the connector. 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
• Causes: Toner clutch trouble. Toner density sensor trouble. Connector/harness trouble. PCU PWB trouble. Toner cartridge trouble. Developing unit trouble.
• Remedy: Replace the toner clutch. Replace the toner density sensor. Connector and harness check. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit.