• Code: F2-23
• Description: Discharge lamp trouble (C) When the discharge lamp open sensor is kept ON for a certain time from turning ON the discharge lamp, it is detected as a trouble.
• Causes: Contact trouble between the discharge lamp PWB (C) and the PCU PWB. Discharge lamp PWB (C) trouble. PCU PWB trouble.
• Remedy: Use SIM5-4 to check lighting of the discharge lamp (C) [DL_C]. Check the discharge lamp PWB (C). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-24
• Description: Discharge lamp trouble (M) When the discharge lamp open sensor is kept ON for a certain time from turning ON the discharge lamp, it is detected as a trouble.
• Causes: Contact trouble between the discharge lamp PWB (M) and the PCU PWB. Discharge lamp PWB (M) trouble. PCU PWB trouble.
• Remedy: Use SIM5-4 to check lighting of the discharge lamp (M) [DL_M]. Check the discharge lamp PWB (M). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-25
• Description: Discharge lamp trouble (Y) When the discharge lamp open sensor is kept ON for a certain time from turning ON the discharge lamp, it is detected as a trouble.
• Causes: Contact trouble between the discharge lamp PWB (Y) and the PCU PWB. Discharge lamp PWB (Y) trouble. PCU PWB trouble.
• Remedy: Use SIM5-4 to check lighting of the discharge lamp (Y) [DL_Y]. Check the discharge lamp PWB (Y). Check the harness and the connector. Replace the PCU PWB.

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

• Code: F2-40
• Description: Toner density sensor trouble (K)
• Causes: Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.

• Code: F2-41
• Description: Toner density sensor trouble (C)
• Causes: Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.

• Code: F2-42
• Description: Toner density sensor trouble (M)
• Causes: Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.

• Code: F2-43
• Description: Toner density sensor trouble (Y)
• Causes: Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.