Brother HL-L9300CDW Service Manual page 345

1.3.28 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
density sensor (Function code 72)" in this chapter
performing this maintenance mode 83 after replacing the main PCB ASSY, make sure to
perform the
<Operating procedure>
Model without touch panel
(1) Press the
"MAINTENANCE 83" on the LCD in the
initial state of the maintenance mode.
Then, press the OK key. The machine
displays "PLS WAIT 83" on the LCD
and starts the developing bias voltage
correction.
(2) When developing bias voltage
correction is completed, "MODE KYMC
****" is displayed on the LCD. When
you press the Go key, the machine
returns to the initial state of the
maintenance mode.
(* represents any number from 0 to 3.)
Note:
If developing bias voltage correction fails, "ERROR 83" is displayed on the LCD. Display the
error message by pressing the
the error message.
Error message
FAILED DEVBIAS
TONER EMPTY #
Cover is Open
Replace Toner
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
"1.3.21 Sensitivity adjustment of density sensor (Function code 72)"
or key to display
key, and take the following measure that corresponds to
Remove the error factors with the following operations and press
the Go key for the model without a touch panel and the Mono key
for the model with a touch panel 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 unit.
*
Replace the empty toner cartridge and press the Go key for the
model without a touch panel and the Mono key for the model with
a touch panel 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 key for the
model without a touch panel and the Mono key for the model with
a touch panel to clear the error. After the sensitivity adjustment of
the density sensor
developing bias voltage value is compensated again.
"1.3.21 Sensitivity adjustment of
has been done more than once. When
Model with touch panel
(1) Press the 8 and 3 keys in this order in
the initial state of the maintenance
mode. The machine displays "PLS
WAIT 83" on the LCD and starts the
developing bias voltage correction.
(2) When developing bias voltage
correction is completed, "MODE KYMC
****" is displayed on the LCD. When
you press the Mono key, the machine
returns to the initial state of the
maintenance mode.
(* represents any number from 0 to 3.)
Measure
(Function code 72) is performed, the
(Function code 72) is performed, the
5-57
first.
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