• Code: EE-EC
• Description: Automatic toner density adjustment error (Sampling level 76 - 117/139 - 178)
• Causes: Toner density sensor trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: EE-EL
• Description: Automatic toner density adjustment error (Overtoner)
• Causes: Toner density sensor trouble. Charging voltage/ developing voltage trouble, toner density trouble, or developing unit trouble. MFPC PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the MFPC PWB.

• Code: EE-EU
• Description: Automatic toner density adjustment error (Undertoner)
• Causes: Toner density sensor trouble. Charging voltage/ developing voltage trouble, toner density trouble, or developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the MFPC PWB.

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

• Code: F2-23
• Description: Discharge lamp trouble (CMY)
• Causes: Contact trouble between the discharge lamp PWB (C) and the PCU PWB. Discharge lamp PWB (C) trouble. MFPC PWB trouble.
• Remedy: Replace the discharge lamp PWB (C). Check the harness and the connector. Replace the MFPC PWB.

• Code: F2-39
• Description: Process thermister trouble
• Causes: Process thermister trouble. Process thermister harness connection trouble. MFPC PWB trouble
• Remedy: Replace the process thermister. Check connection of the harness and the connector. Replace the MFPC 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. MFPC PWB trouble
• Remedy: Replace the toner density sensor. Harness and connector connection trouble. Replace the developing unit. Replace the MFPC 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. MFPC PWB trouble
• Remedy: Replace the toner density sensor. Harness and connector connection trouble. Replace the developing unit. Replace the MFPC PWB.