Sensitivity Adjustment Of Density Sensor (Function Code 72) - Brother HL-4140CN Service Manual

1.4.18 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.
Note:
If you replace the main PCB ASSY, be sure to carry out this procedure. This function
must not be executed until it is verified that the printer is in the ready state.
<Operating procedure>
(1) Press the
the maintenance mode. Then, press the OK button. "PLEASE WAIT" is displayed on the
LCD.
(2) When the parameter is obtained without errors, the printer 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.
Error message
FAILED
TONER EMPTY # *
Cover is Open
Replace Toner
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
or button to display "MAINTENANCE 72" on the LCD in the initial state of
Remove the error factors with the following operations and
press the Go button to clear the error.
- Re-insert the toner cartridge in the correct position.
- Replace the toner cartridge.
- Replace the drum unit.
- Replace the waste toner box.
- Replace the belt unit.
- Replace the registration mark sensor holder ASSY.
Replace the empty toner cartridge and press the Go button
to clear the error. Perform the sensitivity adjustment of the
density sensor again.
Close the front cover.
Replace the black toner cartridge and press the Go button to
clear the error. Perform the sensitivity adjustment of the
density sensor again.
5-35
Measure
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