Code :

Code: F2-71
Description: Improper toner cartridge detection (C)
Causes: An improper toner cartridge is inserted. (The main unit detects a toner cartridge of a different specification.) Toner cartridge trouble. PCU PWB trouble.
Remedy: Replace the toner cartridge. Replace the PCU PWB.

Code: F2-72
Description: Improper toner cartridge detection (M)
Causes: An improper toner cartridge is inserted. (The main unit detects a toner cartridge of a different specification.) Toner cartridge trouble. PCU PWB trouble.
Remedy: Replace the toner cartridge. Replace the PCU PWB.

Code: F2-73
Description: Improper toner cartridge detection (Y)
Causes: An improper toner cartridge is inserted. (The main unit detects a toner cartridge of a different specification.) Toner cartridge trouble. PCU PWB trouble.
Remedy: Replace the toner cartridge. Replace the PCU PWB.

Code: F2-74
Description: Toner cartridge CRUM error (K)
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: F2-75
Description: Toner cartridge CRUM error (C)
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: F2-76
Description: Toner cartridge CRUM error (M)
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: F2-77
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.