Brother Facsimile Equipment MFC7420 - Manual (Page 220)

Confidential 9-32
I-5 Dirt on the back of paper
Possible cause Step Check Result Remedy
Fixing unit
dirty 1 Is the pressure roller dirty?
Is any other area in the
printer dirty? Yes Clean the pressure roller referring
to the following procedure.
Yes Replace the drum unit Dirt in the
drum unit 2 Is the transfer roller dirty?
Is the problem solved after
replacing the drum unit?
No Replace the high-voltage power
supply PCB.
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/Set
(Menu)
, Start, ▲, ▲, ▲, ▲ keys in this order so that the machine goes into
the maintenance mode.
(3) MFC7420/7820N
Press the 6 and 7 keys.
DCP7010/7020/7025
Enter 6 and 7 by using the and Set keys.
The machine starts to print the grid pattern continuously.
(4) When five pages are printed, press the Stop key. The machine returns to the initial stage of the
maintenance mode.
(5) MFC7420/7820N
Press the 9 key twice so that the machine returns to the ready status.
DCP7010/7020/7025
Enter 9 twice by using the and Set keys so that the machine returns to the ready status.