Brother MFC6800 Service Manual page 154

Trouble
(20) Fading (black to white)
(21) Gray background
(22) Toner specks
At the printer side
Replace the toner cartridge.
Replace the high-voltage power supply PCB.
At the printer side
Instruct the user to use paper of the recommended weight (less
2
than 36 lb./m ).
Clean the toner sensors (LED and light-receiver).
Check the toner sensor harnesses.
Replace the toner cartridge.
Replace the drum unit.
Replace the high-voltage power supply PCB.
At the printer side
Instruct the user to use paper of the recommended weight (less
2
than 36 lb./m ).
Replace the toner cartridge.
Replace the drum unit.
6 -2 7
Action to be taken