Brother DCP-6690CW, Service Manual, Page: 383 / 506

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9.4.18 Alignment of Vertical Print Lines in Monochrome (Function code 65)
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Function
This function allows you to align vertical lines printed in the forward and backward direction of
the head/carriage unit.
If the head/carriage unit or main PCB is replaced with a new one, you need to make the
adjustment given in this section.
NOTE: If the head/carriage unit is replaced, you need to make other adjustments in addition.
Refer to Chapter 7, Section 7.2 [ 4 ].
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Operating Procedure
Before starting the operation below, be sure to set A4-size paper in the paper tray for printing
check patterns.
(1) Press the 6 and 5 keys in this order in the initial stage of the maintenance mode. Then press
the 1 key.
The machine displays the "PRINTING" on the LCD and prints three sets of vertical
alignment check patterns (shown on the following pages) in monochrome for 450 dpi, 600
dpi and 1200 dpi, each of which consists of #0 through #8 blocks. If the vertical alignment
is ON, #5 block shows vertically aligned lines.
The "450DPI NO. (1-8)" appears on the LCD.
(2) For 450 dpi, check the printed vertical alignment check patterns and find which number
block shows full alignment. If the full alignment block is other than #5, enter that block
number by using the numerical keys. The "600DPI NO. (1-8)" appears on the LCD.
(3) For 600 dpi, perform the same operation as in step (2).
The "1200DPI NO. (1-8)" appears on the LCD.
(4) For 1200 dpi, 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 in the above
procedure, then go back to step (1) to confirm that #5 block becomes aligned.