The new toner sensor detected that no toner cartridge was set.
The new toner box sensor detected that no toner box was set.
Detected that the drum unit was not set by detecting the electrodes current.
High-voltage power supply PCB
Replace the high-voltage power supply
New toner box actuator coming
off or caught in some sections of
Reattach the new toner box
Dirt on the electrodes of the drum
unit and those of the machine
Clean the electrodes of the drum unit and
Dirt on the high-voltage power
Clean the high-voltage power supply PCB
High-voltage power supply PCB
Replace the high-voltage power supply