Code :

Code: 7B
Description: Engine PCB error.
Causes: 1 Harness connection failure between engine PCB and main PCB. 2 Engine PCB failure. 3 Main PCB failure.
Remedy: 1 Harness connection failure between engine PCB and main PCB Check the harness connection between the engine PCB ASSY and main PCB ASSY, and reconnect it. 2 Engine PCB failure Replace the engine PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.

Code: 7D
Description: Dirt on drum unit.
Causes: 1 Dirt or dust on drum unit electrodes. 2 High-voltage power supply PCB failure. 3 Engine PCB failure. 4 Main PCB failure.
Remedy: 1 Dirt or dust on drum unit electrodes Clean the electrodes of the drum unit and main body. (Refer to Fig. 2-10 (next page) and Fig. 2-13 (P2-63)) 2 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

Code: 81
Description: Incorrect density sensor measurement value when implementing adjustment of color density.
Causes: 1 Foreign object is affixed around the density sensor. 2 Harness connection failure of registration mark sensor holder ASSY. 3 Density sensor failure. 4 High-voltage power supply PCB failure. 5 Engine PCB failure. 6 Low-voltage power supply PCB failure. 7 Main PCB failure.
Remedy: 1 Foreign object is affixed around the density sensor Remove the foreign object affixed around the density sensor. 2 Harness connection failure of registration mark sensor holder ASSY Check the harness connection of the registration mark sensor holder ASSY and reconnect it. 3 Density sensor failure Replace the registration mark sensor holder ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 Engine PCB failure Replace the engine PCB ASSY. 6 Low-voltage power supply PCB failure Replace the low-voltage power supply PCB ASSY. 7 Main PCB failure Replace the main PCB ASSY.

Code: 82
Description: Density patch measurement is not completed normally when implementing adjustment of color density.
Causes: 1 Foreign object is affixed around the density sensor. 2 Harness connection failure of registration mark sensor holder ASSY. 3 Density sensor failure. 4 High-voltage power supply PCB failure. 5 Engine PCB failure. 6 Low-voltage power supply PCB failure. 7 Main PCB failure.
Remedy: 1 Foreign object is affixed around the density sensor Remove the foreign object affixed around the density sensor. 2 Harness connection failure of registration mark sensor holder ASSY Check the harness connection of the registration mark sensor holder ASSY and reconnect it. 3 Density sensor failure Replace the registration mark sensor holder ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 Engine PCB failure Replace the engine PCB ASSY. 6 Low-voltage power supply PCB failure Replace the low-voltage power supply PCB ASSY. 7 Main PCB failure Replace the main PCB ASSY.