Brother MFC260C Service Manual page 272

(6) To adjust the left margin, enter the measured value (in units of 0.1 mm) multiplied by 10.
In this example, the left margin measured in step (3) is 1.3 mm, so press the 1, 3, and OK keys.
(7) The "RIGHT: 10" appears on the LCD.
To adjust the right margin, enter the measured value (in units of 0.1 mm) multiplied by 10.
In this example, the right margin measured in step (3) is 1.4 mm, so press the 1, 4, and OK
keys.
(8) Upon completion of the entry, the machine automatically returns to the initial stage of the
maintenance mode.
Go back to step (2) and print out the margin check pattern again.
(9) Measure the left and right margins on the printout.
If both margins are within the range from 0.9 to 1.1 mm, the adjustment is completed.
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