Brother HL-L8250CDN Service Manual page 288

1.3.2 Monochrome image quality test pattern (Function code 09)
<Function>
This function is used to print various monochrome test patterns and check the quality and if
there is any image loss.
<Operating procedure>
Model without touch panel
(1) Press the
"MAINTENANCE 09" on the LCD in the
initial state of the maintenance mode.
Then, press the OK key. Printing of a
monochrome image quality test pattern
(see the figure below) is started.
(2) When printing is finished, the machine
returns to the initial state of the
maintenance mode.
or key to display
Fig. 5-1
5-5
Model with touch panel
(1) Press the 0 and 9 keys in this order in
the initial state of the maintenance
mode. "MAINTENANCE 09" is
displayed on the LCD. Printing of a
monochrome image quality test pattern
(see the figure below) is started.
(2) When printing is finished, the machine
returns to the initial state of the
maintenance mode.
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