Brother MFC MFC-7840W User Manual

122
Cleaning the corona wire B
If you have print quality problems, clean the
corona wire as follows:
a Turn off the machine’s power switch.
Unplug the telephone line cord first,
disconnect all cables, and then unplug
the power cord from the AC power
outlet.
b Open the front cover.
c Slowly take out the drum unit and toner
cartridge assembly.
CAUTION
We recommend that you place the drum
unit and toner cartridge assembly on a
clean, flat surface with a sheet of
disposable paper or cloth underneath it in
case you accidentally spill or scatter toner.
Handle the toner cartridge carefully. If toner
scatters on your hands or clothes, wipe or
wash it off with cold water at once.
To prevent damage to the machine caused
by static electricity, DO NOT touch the
electrodes shown in the illustration.
d Clean the corona wire inside the drum
unit by gently sliding the green tab from
right to left and left to right several times.
CAUTION
Be sure to return the green tab to the home
position (a) (1). If you do not, printed pages
may have a vertical stripe.
e Put the drum unit and toner cartridge
assembly back in the machine.
f Close the front cover.
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Brother MFC MFC-7840W Specifications

General

Print Technology	Laser
Print Resolution	Up to 2400 x 600 dpi
Paper Capacity	250 sheets
ADF Capacity	35 sheets
Scan Resolution	Up to 19200 x 19200 dpi (interpolated)
Fax Modem Speed	33.6 Kbps
Functions	Print, Copy, Scan, Fax
Maximum Copying Resolution	600 x 600 dpi
Optical Scan Resolution	600 x 2400 dpi
Wireless	Yes
Copy Resolution	600 x 600 dpi
Fax Transmission Speed	33.6 Kbps
Display	LCD
Weight	25.6 lbs
Connectivity	USB, Wireless
Scanner Type	Flatbed
Connectivity Technology	Wireless, USB
Printer Type	All-in-One
Scan Type	Flatbed, ADF