Sensitivity Adjustment Of Density Sensor (Function Code) - Brother MFC-9130CW Service Manual

1.4.27 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
for correcting developing bias voltage is adjusted.
<Operating procedure>
(1) Press the 7 and 2 keys in this order in the initial state of the maintenance mode.
"PLS WAIT 72" is displayed on the LCD.
(2) When the parameter is obtained without errors, the machine returns to the initial state of
the maintenance mode. If the sensitivity adjustment of the density sensor fails, "ERROR
72" is displayed on the LCD. Display the error message by pressing the
the following measure that corresponds to the error message.
dens_l_drk_err
belt_err
dens_pat_err
dens_calc_err
dens_led_adj_err
lph_calc_err
TONER EMPTY #
Cover is Open
Replace Toner
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
LCD
- Check the harness connection of the eject sensor PCB and
reconnect it.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
- Replace the belt unit.
- Replace the waste toner box.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
- Check if the toner cartridges and drum units are set in the
correct order of colors.
- Replace the toner cartridges and drum units.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
- Replace the belt unit.
- Replace the waste toner box.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
- Replace the toner cartridges and drum units.
- Securely close the joint cover ASSY.
- Clean the LED ASSY.
- Check the attachment of the LED ASSY, and reattach it.
*
Replace the empty toner cartridge and press the Mono Start
key to clear the error. Perform the sensitivity adjustment of
the density sensor again.
Close the joint cover ASSY .
Replace the black toner cartridge and press the Mono Start
key to clear the error. Perform the sensitivity adjustment of
the density sensor again.
Description
5-52
key, and take
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