Brother MFC640CW Service Manual page 231

(4) On the 2nd sheet, check the printed vertical alignment pattern for 750 dpi and perform the same
operation as in step (2).
The machine automatically returns to the initial stage of the maintenance mode.
NOTE: If #1 or #8 block is fully aligned so that you press the 1 or 8 key (or you enter 1 or 8) in
the above procedure, then go back to step (1) to confirm that #5 block becomes aligned.
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