Code :

Code: 6300
Display: No Waste Toner Install the Waste Toner Box. Refer to the User's Guide for instructions.
Description: BCLN terminal current value detected that no waste toner box was set.
Causes: 1 Dirt on the BCLN terminals of the main body 2 Dirt on the terminal of the high-voltage power supply PCB 3 High-voltage power supply PCB failure 4 Main PCB failure

Code: 6400
Display: No Belt Unit Open the Top Cover, pull out all 4 Drum Units completely and install the Belt Unit.
Description: The registration mark sensor detected that no belt unit was set.
Causes: 1 Registration mark L PCB harness connection failure 2 Eject sensor PCB harness connection failure 3 Eject sensor PCB failure 4 Registration mark L failure 5 Main PCB failure

Code: 6801
Display: Cooling Down Wait for a while
Description: The internal temperature sensor detected a temperature higher than the specified value.
Causes: 1 Internal temperature sensor harness connection failure 2 Eject sensor PCB harness connection failure 3 Eject sensor PCB failure 4 Main PCB failure

Code: 6901
Display: Fuser Error Turn the power off, then on again. Leave the machine for 15 min.
Description: Some fuser unit errors occurred at power-ON or upon recovery from sleep mode.
Causes: 1 Each harness connection failure of the fuser unit 2 Eject sensor PCB harness connection failure 3 Fuser unit failure 4 Eject sensor PCB failure 5 Low-voltage power supply PCB failure 6 Main PCB failure

Code: 6902
Display: Self-Diagnostic Will Automatically Restart within 15 minutes.
Description: After the error was detected at the fuser unit, power was turned ON again and the error is being checked. (If power is turned OFF and ON after error code 6901 occurred, this code is displayed for about 15 minutes.)
Causes: 1 Each harness connection failure of the fuser unit 2 Eject sensor PCB harness connection failure 3 Fuser unit failure 4 Eject sensor PCB failure 5 Low-voltage power supply PCB failure 6 Main PCB failure

Code: 6A00
Display: Drum ! Slide the Green tab on Drum Unit.
Description: Electric discharge that may be caused by dirt on the corona wire of the drum unit was detected.
Causes: 1 Dirt on the GRID terminals of the main body 2 Dirt on the terminal of the high-voltage power supply PCB 3 High-voltage power supply PCB failure 4 Main PCB failure

Code: 6B01
Display: Drum Stop Replace the Drum Unit. Refer to the instructions in the carton of the new drum.
Description: Electric discharge was detected when the number of the drum unit (Black) rotations had become more than twice of the upper limit.
Causes: 1 Dirt on the GRID terminals of the main body 2 Dirt on the terminal of the high-voltage power supply PCB 3 High-voltage power supply PCB failure 4 Main PCB failure

Code: 6B02
Display: Drum Stop Replace the Drum Unit. Refer to the instructions in the carton of the new drum.
Description: Electric discharge was detected when the number of the drum unit (Yellow) rotations had become more than twice of the upper limit.
Causes: 1 Dirt on the GRID terminals of the main body 2 Dirt on the terminal of the high-voltage power supply PCB 3 High-voltage power supply PCB failure 4 Main PCB failure