Brother DCPJ525W Service Manual page 265

H: Top margin adjustment
(Disc printing models only)
I: Right and left margins
adjustment
(Disc printing models only)
(3) Repeat steps (1) and (2) until no problem is found.
Check that the top margin is correct.
On the disc printing check pattern, if the top margin is not
within the range from 2.0 to 3.0 mm, adjust the top margin in
the maintenance mode (Function code 66), referring to
Chapter 5, Section 1.4.22.
Check that the right and left margins are correct.
On the disc printing check pattern, if the right or left margin is
not within the range from 0.0 to 1.0 mm, adjust the margins in
the maintenance mode (Function code 66), referring to
Chapter 5, Section 1.4.22.
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