Brother Mfc 7840wr User Manual

Troubleshooting and routine maintenance121
B
ePut the print sample in front of the drum 
unit, and find the exact position of the 
poor print.
 
fTurn the drum unit gear by hand while 
looking at the surface of the OPC 
drum (1).
 
gWhen you have found the mark on the 
drum that matches  the print sample, 
wipe the surface of the OPC drum with a 
dry cotton swab until the dust or glue on 
the surface comes off.
 
CAUTION 
The drum is photosensitive so DO NOT 
touch it with your fingers.
  
DO NOT clean...

122
Replacing the consumable itemsB
You will need to replace the consumable items when the machine indicates that the life of the 
consumable is over.
Note
• Discard used consumable items according to local regulations. (See  EU Directive 2002/96/EC 
and EN50419  on page 85.) If you have questions, call yo ur local waste disposal office. Be sure 
to reseal the consumable items tightly so  that the material inside does not spill.
• We recommend placing used consumable items on a sheet of paper to prevent...

Troubleshooting and routine maintenance123
B
WARNING 
HOT SURFACE
After you have just used the machine, some 
internal parts of the machine will be 
extremely hot. To prevent injury, when you 
open the front or back cover (back output 
tray) of the machine, DO NOT touch the 
shaded parts shown in the illustration.
 
 
 
aOpen the front cover. 
bSlowly take out the drum unit and toner 
cartridge assembly.
 
CAUTION 
We recommend that you put the drum unit 
and toner cartridge assembly on a clean, 
flat...

124
CAUTION 
Handle the toner cartridge carefully. If toner 
scatters on your hands or clothes, wipe or 
wash it off with cold water at once.
  
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustrations.
 
 
 
 
Brother machines are designed to work 
with toner of a particular specification and 
will work to a level of  optimum performance 
when used with genuine Brother toner 
cartridges (TN-2110/TN-2120). Brother 
cannot guarantee this optimum 
performance if toner or...

Troubleshooting and routine maintenance125
B
fPut the new toner cartridge firmly into 
the drum unit until you hear it lock into 
place. If you put it in correctly, the lock 
lever will lift automatically.
 
CAUTION 
Make sure that you put in the toner 
cartridge correctly or it may separate from 
the drum unit.
 
gClean the corona wire of 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 (...

126
Note
The drum unit is a consumable item, and 
it is necessary to replace it periodically. 
There are many factors that determine the 
actual drum life, such as temperature, 
humidity, type of paper and how much 
toner you use for the number of pages per 
print job. The estimated drum life is 
approximately 12,000 pages
1. The actual 
number of pages your  drum will print may 
be significantly less than this estimate. 
Because we have no control over the 
many factors that determine the actual 
drum...

Troubleshooting and routine maintenance127
B
 
To prevent damage to the machine caused 
by static electricity, DO NOT touch the 
electrodes shown in  the illustration.
 
 
cPush down the green lock lever and take 
the toner cartridge out of the drum unit.
CAUTION 
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustrations.
 
 
 
 
Wait to unpack a new drum unit until 
immediately before you put it in the 
machine. Exposure to direct sunlight or 
room light may damage the...

128
gPut the new drum unit and toner 
cartridge assembly in the machine.
 
hPress Clear/Back .
To confirm you are installing a new 
drum, press 1 .
iWhen the LCD shows  Accepted, close 
the front cover.
Machine informationB
Checking the serial numberB
You can see the machine’s serial number on 
the LCD.
a(For MFC-7320) Press  Menu, 4,  1.
(For MFC-7440N) Press  Menu, 5,  1.
(For MFC-7840W) Press  Menu, 6,  1.
bPress  Stop/Exit .
Checking the page countersB
You can see the machine’s page counters for...

Troubleshooting and routine maintenance129
B
Packing and shipping 
the machine
B
CAUTION 
Make sure that the machine has fully 
cooled down by leaving it disconnected 
from the power for at least 30 minutes 
before packing.
 
When you transport the machine, use the 
packing materials that came with your 
machine. If you do not pack the machine 
correctly, you could void your warranty.
aTurn off the machine.
bUnplug the machine from the telephone 
wall socket.
cUnplug all the cables and AC power 
cord...

130
C
On-screen 
programming
C
Your machine has been designed to be easy 
to use. The LCD provides on-screen 
programming using the menu keys.
We have created step by step on-screen 
instructions to help you program your 
machine. Simply follow the steps as they 
guide you through the menu selections and 
programming options.
Menu tableC
You can program your machine by using the 
Menu table on page 132. These pages list 
the menu selections and options.
Press  Menu followed by the menu numbers 
to...