Brother 7840 W User Guide

							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 the surface of the 
photosensitive drum with a sharp object.
  
DO NOT use excessive force when 
cleaning the drum unit.
 
hPut the toner cartridge back into the 
drum unit until you hear it lock into place. 
If you put the cartridge in correctly, the 
green lock lever will lift automatically.
 
iPut the drum unit and toner cartridge 
assembly back in  the machine.
 
jClose the front cover.
kPlug the machine’s power cord back into 
the electrical socket first, and then 
reconnect all cables and telephone line 
cord. Turn on the machine.
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							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 accidentally  spilling or scattering the material inside.
• If you use paper that is not a direct equiv alent for the recommended paper, the life of 
consumable items and machine parts may be reduced.
 
Replacing a toner cartridgeB
The High Yield toner cartridges can print 
approximately 2,600 pages
1 and the 
Standard toner cartridges can print 
approximately 1,500 pages
1. Actual page 
count will vary depending on your average 
type of document (i.e., standard letter, 
detailed graphics).
When a toner cartridge is running low, the 
LCD shows  Toner Low . 
1Approx. cartridge yield is declared in accordance 
with ISO/IEC 19752.
Note
It is a good idea to keep a new toner 
cartridge ready for use when you see the 
Toner Low  warning.
 
Toner cartridgeDrum unit
   
Order No. TN-2110, TN-2120Order No. DR-2100 
						

							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 surface with a sheet of disposable 
paper or cloth underneath it in case you 
accidentally spill  or scatter toner.
  
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 used toner cartridge out of the drum 
unit.
WARNING 
DO NOT put a toner cartridge into a fire. It 
could explode, resulting in injuries.
  
						

							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 toner cartridges of 
other specifications ar e used. Brother does 
not therefore recommend the use of 
cartridges other than genuine Brother 
cartridges with this ma chine, or the refilling 
of empty cartridges with toner from other 
sources. If damage is caused to the drum 
unit or other parts of this machine as a 
result of the use of toner or toner cartridges 
other than genuine Brother products due to 
the incompatibility or la ck of suitability of 
those products with this machine, any 
repairs required as a result may not be 
covered by the warranty. 
 
 
Unpack the toner cartridge just before you 
put it in the machine. If a toner cartridge is 
left unpacked for a long time, the toner life 
will be shortened.
 
Note
Be sure to seal up the used toner cartridge 
tightly in a suitable bag so that toner 
powder does not spill  out of the cartridge.
 
dUnpack the new toner cartridge. Hold 
the cartridge level with both hands and 
gently rock it from side to side five or six 
times to spread the toner evenly inside 
the cartridge.
 
ePull off the protective cover.  
						

							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 ( a) (1). If you do not, printed pages 
may have a vertical stripe.
 
hPut the drum unit and toner cartridge 
assembly back in  the machine.
 
iClose the front cover.
CAUTION 
DO NOT turn off the machine or open the 
front cover until the  LCD returns to the 
standby state.
 
Replacing the drum unitB
The machine uses a drum unit to create print 
images on paper. If the LCD shows 
Drum End Soon , the drum unit is near the 
end of its life and it is time to buy a new one.
Even if the LCD shows  Drum End Soon, 
you may be able to continue printing without 
having to replace the drum unit for a while. 
However, if there is a noticeable deterioration 
in the output print quality (even before 
Drum End Soon  appears), then the drum 
unit should be replaced. You should clean the 
machine when you replace the drum unit. 
(See  Cleaning the laser scanner window  
on page 116.)
CAUTION 
While removing the drum unit, handle it 
carefully because it may contain toner. If 
toner scatters on your hands or clothes, 
wipe or wash it off wit h cold water at once.
 
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							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 life, we cannot guarantee a 
minimum number of  pages that will be 
printed by your drum.
1Drum yield is approximate, and may vary by type of 
use.
 
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 surface with a sheet of disposable 
paper or cloth underneath it in case you 
accidentally spill 
or scatter toner.
  
						

							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 drum unit.
 
Note
Be sure to seal up the used drum unit 
tightly in a bag so that toner powder does 
not spill out of the unit.
 
dUnpack the new drum unit.
ePut the toner cartridge firmly into the 
new drum unit until you hear it lock into 
place. If you put the cartridge in 
correctly, the green lock lever will lift 
automatically.
 
CAUTION 
Make sure that you put in the toner 
cartridge correctly or it may separate from 
the drum unit.
 
fClean 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 (a) (1). If you do not, printed pages 
may have a vertical stripe.
 
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							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 
copies, printed pages, reports and lists, faxes 
or a summary total.
a(For MFC-7320) Press  Menu, 4,  2.
(For MFC-7440N) Press  Menu, 5,  2.
(For MFC-7840W) Press  Menu, 6,  2.
bPress  a or  b to choose  Total, 
Fax/List , Copy or  Print.
You can see the machine’s page count.
cPress  Stop/Exit .
Checking the Drum lifeB
You can see the machine’s drum life on the 
LCD.
a(For MFC-7320) Press  Menu, 4,  3.
(For MFC-7440N) Press  Menu, 5,  3.
(For MFC-7840W) Press  Menu, 6,  3.
bPress  OK.
You can see the remaining percentage 
of drum life.
cPress Stop/Exit . 
						

							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 from the machine.
dOpen the front cover.
eRemove the drum unit and toner 
cartridge assembly. Leave the toner 
cartridge installed in the drum unit.
fPlace the drum unit and toner cartridge 
assembly into the plastic bag and seal 
the bag.
gClose the front cover.
hWrap the machine in the plastic bag and 
place it in the original carton with the 
original packing material.
iPack the drum unit and toner cartridge 
assembly, AC cord and printed 
materials in the original carton as shown 
below:
 
jClose the carton and tape it shut. 
						

							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 program your machine. 
For example, to set  Beeper volume to  Low:
aPress  Menu, 1,  4, 2 .
bPress  a or  b to choose  Low.
cPressOK.
Memory storageC
Your menu settings are stored permanently, 
and in the event of a power failure will  not be 
lost. Temporary settings (for example, 
Contrast, Overseas Mode) will  be lost. The 
MFC-7840W can store the date and time up 
to 4 days.
Menu keysC
Menu and featuresC
 
 
Access the menu.
 Go to the next menu level.
Accept an option.
 Exit the menu by pressing 
repeatedly.
Go back to the previous 
menu level.
 Scroll through the current 
menu level.
 Go back to the previous 
menu level or forward to the 
next menu level.
 Exit the menu.
Menu
Clear/Back OK
Search/Speed Dial
Menu
OK
Clear/Back