Code :

Code: F2-40
Description: Toner density sensor trouble
Causes: Toner density sensor output abnormality. Sensor connector and harness connection trouble. Developing unit trouble. PCU PWB trouble.
Remedy: Replace the toner density sensor. Check connection of the sensor connector and the harness. Replace the developing unit. Replace the PCU PWB.

Code: F2-47
Description: Room temperature/humidity sensor trouble
Causes: Temperature/humidity sensor trouble. Room temperature/ humidity sensor harness and connector connection trouble on manual paper feed. PCU PWB trouble.
Remedy: Replace the temperature/humidity sensor. Check connection of the temperature/humidity sensor harness and the connector. Replace the PCU PWB.

Code: F2-58
Description: Temperature/humidity sensor trouble
Causes: Process humidity sensor trouble. Harness and connector connection trouble. PCU PWB trouble.
Remedy: Replace the process humidity sensor. Check connection of the connectors and the harness. Replace the PCU PWB.

Code: F2-59
Description: Room temperature/humidity sensor trouble
Causes: Process thermistor trouble. Process thermistor harness connection trouble. PCU PWB trouble.
Remedy: Replace the process thermistor. Check connection of the process thermistor harness and the connector. Replace the PCU PWB.

Code: F2-64
Description: Toner supply operation trouble
Causes: Toner motor trouble. Toner density sensor trouble. Connector/harness trouble. PCU PWB trouble. Toner cartridge trouble. Developing unit trouble. Tone hopper section trouble
Remedy: Replace the toner motor. Replace the toner density sensor. Connector and harness check. Replace the PCU PWB. Replace the toner cartridge. Replace the developing unit. Replace the toner hopper unit. Check the toner hopper section.

Code: F2-70
Description: Improper toner cartridge detection
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
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: Image density sensor adjustment trouble
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.