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.