Developing Bias Voltage Correction (Function Code 83) - Brother HL-4140CN Service Manual

1.4.25 Developing bias voltage correction (Function code 83)

<Function>
This function performs developing bias voltage correction to fix the density of each color toner
when printed color is not correct.
Note:
Before this function is performed, there is a need that the
sensor (Function mode 72)"
maintenance mode 83 after replacing the main PCB, make sure to perform the
adjustment of density sensor (Function mode 72)"
<Operating procedure>
(1) Press the
the maintenance mode. Then, press the OK button. The printer displays "PLEASE
WAIT" on the LCD and starts the developing bias voltage correction.
(2) Upon completion of the developing bias voltage correction, 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.
Note:
Any panel operation is invalid during the developing bias voltage correction.
has been done more than once. When performing this
or button to display "MAINTENANCE 83" 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. After the sensitivity adjustment of the
density sensor
developing bias voltage value is compensated again.
Close the front cover.
Replace the black toner cartridge and press the Go button to
clear the error. After the sensitivity adjustment of the
density sensor
developing bias voltage value is compensated again.
5-48
"Sensitivity adjustment of density
first.
Measure
(Function code 72) is performed, the
(Function code 72) is performed, the
"Sensitivity
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