Brother MFC-9340CDW Service Manual

5-52
Confidential
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 key, and take
the following measure that corresponds to the error message.
* # indicates the toner color (Y, M, or C) of which cartridge became empty.
LCD Description
dens_l_drk_err - Check the harness connection of the eject sensor PCB and
reconnect it.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
belt_err - Replace the belt unit.
- Replace the waste toner box.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
dens_pat_err
dens_calc_err
- 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.
dens_led_adj_err - Replace the belt unit.
- Replace the waste toner box.
- Replace the registration mark L PCB ASSY.
- Replace the main PCB ASSY.
lph_calc_err - 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.
TONER EMPTY #
*
Replace the empty toner cartridge and press the Mono Start
key to clear the error. Perform the sensitivity adjustment of
the density sensor again.
Cover is Open Close the joint cover ASSY .
Replace Toner Replace the black toner cartridge and press the Mono Start
key to clear the error. Perform the sensitivity adjustment of
the density sensor again.

Brother MFC-9340CDW Specifications

Printing Specifications

print speed (black)	up to 23 ppm
print speed (color)	up to 23 ppm
print resolution	up to 600 x 2400 dpi
automatic duplex printing	Yes

Copying Specifications

copy speed (black)	up to 23 cpm
copy speed (color)	up to 23 cpm
copy resolution	600 x 600 dpi
copy reduction/enlargement	25% - 400% in 1% increments

Scanning Specifications

scanner type	Color Flatbed with ADF
document glass size	8.5” x 11.7”
scan resolution (optical)	1200 x 2400 dpi
scan resolution (interpolated)	19200 x 19200 dpi

Fax Specifications

fax modem	33.6k bps
fax page memory	up to 500 pages
speed dial locations	200

Memory and Interfaces

memory (standard/max)	192MB / 192MB
standard interfaces	Wireless 802.11b/g/n, Ethernet, Hi-Speed USB 2.0
usb direct interface	Yes

Supplies and Accessories

black toner cartridge yield	2, 500 pages
cyan toner cartridge yield (standard)	1, 400 pages
magenta toner cartridge yield (standard)	1, 400 pages
yellow toner cartridge yield (standard)	1, 400 pages
cyan toner cartridge yield (high capacity)	2, 200 pages
magenta toner cartridge yield (high capacity)	2, 200 pages
yellow toner cartridge yield (high capacity)	2, 200 pages
drum unit yield	15, 000 pages
belt unit yield	50, 000 pages
waste toner box yield	50, 000 pages
multi-purpose paper	Letter, 500 sheets