Brother MFC640CW Service Manual page 178

(5) Check PF adjust check pattern "A" (on the next page) and select the one that is the least
uneven print. Make a note of that pattern number.
If the unevenness is far to the left of check pattern -8, regard it as -8; if it is far to the right of
check pattern +8, regard it as +8. In this case, you need to check whether the paper feed roller
and head/carriage unit are set into place.
(6) Enter the number of the least uneven check pattern found in step (5).
MFC820CW/640CW
For example, if the number of the least uneven check pattern is +4, press the
4, press the and 4 keys. (To enter +, use the
DCP340CW
For example, if the number of the least uneven check pattern is +4, enter + and 4; if -4, enter -
and 4 by using the
(*To enter a plus/minus symbol or numerical code on models having no numerical keypad, press the
key several times to display the
key. Repeat this operation for each symbol or numerical code.)
The machine automatically returns to the initial stage of the maintenance mode.
(7) MFC820CW/640CW
Press the 5 and 8 keys on the machine.
DCP340CW
Enter 5 and 8 by using the
(*To enter a numerical code on models having no numerical keypad, press the
display the numerical code to be entered and then press the Set key. Repeat this operation for each
numerical code.)
The "1.PF 2.EXIT" appears on the LCD.
(8) MFC820CW/640CW
To select the paper ejection roller adjustment, press the 2 key.
DCP340CW
To select the paper ejection roller adjustment, enter 2 by using the
The "EXIT ADJ NO. +0" appears on the LCD.
(9) Check PF adjust check pattern "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.
and Set keys.*
/
or numerical code to be entered, respectively, and then press the Set
and Set keys on the machine.*
6 - 1 3
key; to enter -, use the
and Set keys.*
and 4 keys; if -
key.)
key several times to
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