Brother MFC6800 - Page 154

6-27
Trouble Action to be taken
(20) Fading (black to white) At the printer side
 Replace the toner cartridge.
 Replace the high-voltage power supply PCB.
(21) Gray background At the printer side
 Instruct the user to use paper of the recommended weight (less
than 36 lb./m
2
).
 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.
(22) Toner specks At the printer side
 Instruct the user to use paper of the recommended weight (less
than 36 lb./m
2
).
 Replace the toner cartridge.
 Replace the drum unit.