Code :

Code: F2-77
Description: Toner cartridge CRUM error (Y)
Causes: Toner cartridge (CRUM) trouble. PCU PWB trouble. Connector and harness trouble between PCU PWB and toner cartridge
Remedy: Replace the toner cartridge. Replace the PCU PWB. Check the connector and the harness between the PCU PWB and the toner cartridge.

Code: F2-78
Description: Registration/BK image density sensor trouble (Transfer belt substrate reflection rate abnormality)
Causes: Image density (registration) sensor trouble (Sensor sensitivity adjustment trouble). PCU PWB trouble. Image density (resist) sensor connector and harness connection trouble Image density (registration) sensor dirt. Transfer belt dirt, scratch.
Remedy: Replace the image density (registration) sensor. Replace the PCU PWB. Check connection of the connector and the harness of the image density (resist) sensor. Clean the image density (registration) sensor. Clean or replace the transfer belt.

Code: F3-12
Description: Paper feed tray 1 lift operation trouble
Causes: LUD1 is not turned ON within the specified time. CLUD1 sensor trouble. Paper feed tray 1 lift unit trouble. PCU PWB trouble. Sensor harness and connector connection trouble
Remedy: Check connection of the harness and the connector of LUD1. Replace the lift-up unit. Replace the PCU PWB.

Code: F3-22
Description: Paper feed tray 2 lift operation trouble
Causes: LUD2 does not turn ON within the specified time. CLUD2 sensor trouble. Paper feed tray 2 lift unit trouble. PCU PWB trouble. Sensor harness and connector connection trouble
Remedy: Check the harness and the connector of LUD2. Replace the lift-up unit. Replace the PCU PWB.