Brother DCP-9055CDN, Service Manual

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Confidential
1.4.25 Sensitivity adjustment of density sensor (Function code 72)
<Function>
This function allows you to print the patch data for density sensor sensitivity adjustment on the
belt unit and measure the density with the density sensor. The characteristics of the density
sensor are calculated based on the value measured by the density sensor, and the parameter
is adjusted upon color density adjustment.
<Operating procedure>
(1) Press the 7 and 2 buttons in this order in the initial state of the maintenance mode.
"PLEASE WAIT" is displayed on the LCD.
(2) When the parameter is obtained without errors, the machine returns to the initial state of
the maintenance mode.
When an error message is displayed on the LCD, take the measures described in the
table below.
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
Error message Measure
FAILED Remove the error factors with the following operations and
press the
Start/Black button to clear the error.
- Re-insert the toner cartridge in the correct position.
- Replace the toner cartridge.
- Replace the drum unit.
- Replace the belt unit.
- Replace the registration mark sensor holder ASSY.
TONER EMPTY # * Replace the empty toner cartridge and press the Start/Black
button to clear the error. Perform the sensitivity adjustment
of the density sensor again.
Cover is Open Close the front cover.
Replace Toner Replace the black toner cartridge and press the Start/Black
button to clear the error. Perform the sensitivity adjustment
of the density sensor again.