• 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.

• Code: F2-A0
• Description: After-transfer discharge lamp open trouble (K) The after-transfer discharge lamp open sensor is kept open for a specified time from turning ON the aftertransfer discharge lamp.
• Causes: Connection trouble between the after-transfer discharge lamp PWB and the PCU PWB After-transfer discharge lamp PWB trouble PCU PWB trouble
• Remedy: Use SIM5-4 to check lighting of the after-transfer discharge lamp (K) [DL2_K]. Check the after-transfer discharge lamp PWB (K). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-A1
• Description: After-transfer discharge lamp open trouble (C) The after-transfer discharge lamp open sensor is kept open for a specified time from turning ON the aftertransfer discharge lamp.
• Causes: Connection trouble between the after-transfer discharge lamp PWB and the PCU PWB After-transfer discharge lamp PWB trouble PCU PWB trouble
• Remedy: Use SIM5-4 to check lighting of the after-transfer discharge lamp (C) [DL2_C]. Check the after-transfer discharge lamp PWB (C). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-A2
• Description: After-transfer discharge lamp open trouble (M) The after-transfer discharge lamp open sensor is kept open for a specified time from turning ON the aftertransfer discharge lamp.
• Causes: Connection trouble between the after-transfer discharge lamp PWB and the PCU PWB After-transfer discharge lamp PWB trouble PCU PWB trouble
• Remedy: Use SIM5-4 to check lighting of the after-transfer discharge lamp (M) [DL2_M]. Check the after-transfer discharge lamp PWB (M). Check the harness and the connector. Replace the PCU PWB.

• Code: F2-A3
• Description: After-transfer discharge lamp open trouble (Y) The after-transfer discharge lamp open sensor is kept open for a specified time from turning ON the aftertransfer discharge lamp.
• Causes: Connection trouble between the after-transfer discharge lamp PWB and the PCU PWB After-transfer discharge lamp PWB trouble PCU PWB trouble
• Remedy: Use SIM5-4 to check lighting of the after-transfer discharge lamp (Y) [DL2_Y]. Check the after-transfer discharge lamp PWB (Y). Check the harness and the connector. Replace the PCU PWB.