Brother MFC-8460N Servise Manual page 356

(I-5) Dirt on the back of paper
Possible cause Step
Fuser unit 1
dirty
Dirt in the 2
drum unit
NOTE: This problem may disappear after printing approximately 10 pages of completely blank
sheets.
How to clean the pressure roller
Clean the pressure roller as follows;
(1) Set 5 or more sheets of paper in the paper tray.
(2) Press the [Menu], [Start], [▲], [▲], [▲], [▲] keys in this order so that the machine goes into
the maintenance mode.
(3) Press the [6] and [7] keys. The machine starts to print the grid pattern continuously.
(4) When five pages are printed, press the [Stop/Exit] key. The machine returns to the initial stage
of the maintenance mode.
(5) Press the [9] key twice so that the machine returns to the ready status.
Check
Is the pressure roller dirty?
Is any other area in the
machine dirty?
Is the transfer roller dirty?
Is the problem solved after
replacing the drum unit?
9-32
Result Remedy
Yes Clean the pressure roller referring
to the following procedure.
Yes Replace the drum unit
No Replace the high-voltage power
supply PCB.
Confidential