• Code: F2-22
• Description: Discharge lamp trouble (K)
  A trouble is detected when the discharge lamp open sensor is open for 1 sec after turning ON the discharge lamp.
• Causes: Contact trouble between the discharge lamp PWB (K) and the PCU PWB. Discharge lamp PWB (K) trouble. PCU PWB trouble.
• Remedy: Replace the discharge lamp PWB (K). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-23
• Description: Discharge lamp trouble (C)
  A trouble is detected when the discharge lamp open sensor is open for 1 sec after turning ON the discharge lamp.
• Causes: Contact trouble between the discharge lamp PWB (C) and the PCU PWB. Discharge lamp PWB (C) trouble. PCU PWB trouble.
• Remedy: Replace the discharge lamp PWB (C). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-24
• Description: Discharge lamp trouble (M)
  A trouble is detected when the discharge lamp open sensor is open for 1 sec after turning ON the discharge lamp.
• Causes: Contact trouble between the discharge lamp PWB (M) and the PCU PWB. Discharge lamp PWB (M) trouble. PCU PWB trouble.
• Remedy: Replace the discharge lamp PWB (M). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-25
• Description: Discharge lamp trouble (Y)
  A trouble is detected when the discharge lamp open sensor is open for 1 sec after turning ON the discharge lamp.
• Causes: Contact trouble between the discharge lamp PWB (Y) and the PCU PWB. Discharge lamp PWB (Y) trouble. PCU PWB trouble.
• Remedy: Replace the discharge lamp PWB (Y). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-39
• Description: Process thermister trouble
• Causes: Process thermister trouble. Process thermister 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 (BLACK)
• Causes: Toner density sensor output abnormality (Sample level 25 or less, or 231 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: F2-41
• Description: Toner density sensor trouble (CYAN)
• Causes: Toner density sensor output abnormality (Sample level 25 or less, or 231 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: F2-42
• Description: Toner density sensor trouble (MAGENTA)
• Causes: Toner density sensor output abnormality (Sample level 25 or less, or 231 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.