Brother MFC8500 Service Manual page 161

Trouble
(20) Fading (black to white)
(21) Gray background
(22) Toner specks
At the printer side
Replace the toner cartridge.
l
Replace the high-voltage power supply PCB.
l
At the printer side
Instruct the user to use paper of the recommended weight
l
2
(less than 36 lb./m ).
Clean the toner sensors (LED and light-receiver).
l
Check the toner sensor harnesses.
l
Replace the toner cartridge.
l
Replace the drum unit.
l
Replace the high-voltage power supply PCB.
l
At the printer side
Instruct the user to use paper of the recommended weight
l
2
(less than 36 lb./m ).
Replace the toner cartridge.
l
Replace the drum unit..
l
VI - 27
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Action to be taken
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