Brother FAX-921 - Manual (Page 146)

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3.9 Fine Adjustment of Scanning Start/End Position
n n Function
This function allows you to adjust the scanning start/end position.
n n Operating Procedure
(1) Press the 5 and 4 keys in this order in the initial stage of the maintenance mode.
The LCD shows the current scanning
position correction value as shown at right.
(2) Press the Start key. Each time you press
the Start key, the LCD cycles through the
displays shown at right.
That is, pressing this key cycles through
the correction values (mm) as shown
below.
(3) To stop this operation, press the Stop key. The equipment beeps for one second and returns
to the initial stage of the maintenance mode.
NOTE: The relationship between the scanning start/end positions and their correction values is shown
below.