Brother MFC-3340CN Service Manual page 188

(8) To select the paper ejection roller adjustment, press the 2 key.
The "EXIT ADJ NO. +0" appears on the LCD.
(9) Check the PF adjust check patterns ("B" on the next page) and select the one that is the least
uneven print. Make a note of that pattern number.
(10) Enter the number of the least uneven check pattern found in step (9) in the same way as in step
(6).
The machine automatically returns to the initial stage of the maintenance mode.
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