Brother 7840 W User Guide

							Troubleshooting and routine maintenance101
B
Setting dial tone detectionB
When you send a fax automatically, by 
default your machine will wait for a fixed 
amount of time before it starts to dial the 
number. By changing the Dial Tone setting to 
Detection  you can make your machine dial 
as soon as it detects a dial tone. This setting 
can save a small amount of time when 
sending a fax to many different numbers. If 
you change the setting and start having 
problems with dialling you should change 
back to the default  No Detection setting.
a Press Menu, 0, 5 .
 
bPress  a or  b to choose  Detection  or 
No Detection .
Press OK.
cPress  Stop/Exit .
 
Curled „
Choose  Reduce Paper Curl  mode in the printer driver when you do 
not use our recommended paper. (See  Device Options (For 
Windows
®) or Print Settings (For Macintosh®) in the Software Users 
Guide on the CD-ROM.)
„ Turn the paper over in the paper tray, and print again. (Excluding 
Letterhead paper)
„ Lift up the output tray support flap.
 
„Replace the paper in the paper tray with paper from a freshly opened 
ream.
„ Make sure you are using paper that is recommended for your 
machine. (See  Acceptable paper and other print media  on page 14.)
Examples of poor print 
qualityRecommendation 
						

							102
Telephone line interferenceB
If you are having difficulty sending or 
receiving a fax due to possible interference 
on the telephone line, we recommend that 
you adjust the Equaliz ation for compatibility 
to reduce the modem speed for fax 
operations.
aPress  Menu, 2,  0, 1 .
bPress  a or  b to choose 
Basic(for VoIP)  or Normal  or 
High (MFC-7840W).
„ Basic(for VoIP)  cuts the 
modem speed to 9600 bps. and 
turns the error correction mode 
(ECM) off.
For a standard telephone line: If you 
regularly experience interference on 
your standard telephone line try this 
setting.
If you are using VoIP: VoIP service 
providers offer fax support using 
various standards. If you regularly 
experience fax transmission errors 
try this setting.
„ Normal  sets the modem speed at 
14400 bps.
„ High sets the modem speed at 
33600 bps. (MFC-7840W only)
Press OK.
cPress  Stop/Exit .
Note
When you change the compatibility to 
Basic(for VoIP) , the ECM feature is 
not available.
  
						

							Troubleshooting and routine maintenance103
B
Error and maintenance messagesB
As with any sophisticated office product, errors may occur and consumable items may need to be 
replaced. If this happens, your machine identifies the error or required routine maintenance and 
shows the appropriate message. The most commo n error and maintenance messages are shown 
below.
You can clear most errors and routine maintenanc e messages by yourself. If you need more help, 
the Brother Solutions Center offers t he latest FAQs and troubleshooting tips.
Visit us at http://s olutions.brother.com/.
Error MessageCauseAction
BT Call Sign On
(U.K. only) BT Call Sign
 is set to On. You 
cannot change the Receive Mode 
from Manual to another mode. Set 
BT Call Sign  to Off . (See BT call 
sign (U.K. only)  on page 46.)
Cartridge Error The toner cartridge is not installed 
correctly. Pull out the drum unit, take out the toner 
cartridge that is indicated on the LCD, and 
put it back into the drum unit again.
Drum End Soon The drum unit is near the end of 
its life. Use the drum unit until you have a print 
quality problem; then replace the drum unit 
with a new one.
(See 
Replacing the drum unit  on page 125.)
Size mismatch The paper in the tray is not the 
correct size. Load the correct size of paper in the tray and 
set the “Paper Size” (
Menu, 1 , 3  (See  Paper 
size  in Chapter 3)).
Comm.Error Poor telephone line quality 
caused a communication error. Try sending the fax again or try connecting 
the machine to another telephone line. If the 
problem continues, call the telephone 
company and ask them to check your 
telephone line.
Connection Fail You tried to poll a fax machine 
that is not in Polled Waiting mode. Check the other fax machine’s polling setup. 
						

							104
Cooling Down
Wait for a whileThe temperature of the drum unit 
or toner cartridge is too hot. The 
machine will pause its current 
print job and go into cooling down 
mode. During the cooling down 
mode, you will hear the cooling 
fan running while the LCD shows 
Cooling Down
, and 
Wait for a while .Make sure that you can hear the fan in the 
machine spinning and that the exhaust outlet 
is not blocked by something.
If the fan is spinning, remove any obstacles 
that surround the exhaust outlet, and then 
leave the machine turned on but do not use 
it for several minutes.
If the fan is not spinning do one of the 
following:
(MFC-7320 and MFC-7440N only)
See 
Transferring your faxes or Fax Journal 
report  on page 107 before disconnecting the 
machine so you will not lose any important 
messages.
Then, disconnect the machine from the 
power for several minutes and then 
reconnect it.
(MFC-7840W only)
Disconnect the machine from the power for 
several minutes, then reconnect it. (The 
machine can be turned off for up to 4 days 
without losing faxes stored in the memory. 
See  Transferring your faxes or Fax Journal 
report  on page 107.
Cover is Open   
Close the Front 
Cover. The front cover is not closed 
completely.
Close the front cover of the machine.
Cover is Open   
Close the Fuser 
Cover. The fuser cover is not closed 
completely.
Close the fuser cover of the machine.
Cover is Open   
Open the Back 
Cover and remove 
the jammed paper, 
or close the 
Fuser Cover. The fuser cover is not closed 
completely or paper was jammed 
in the back of the machine when 
you turned on the power.
Make sure paper is not jammed inside the 
back of the machine, and then close the 
fuser cover and press 
Start.
Disconnected The other person or other 
person’s fax machine stopped the 
call. Try to send or receive again.
Document Jam The document was not inserted 
or fed correctly, or the document 
scanned from the ADF was too 
long. See 
Document jams  on page 109 or  Using 
the automatic document feeder (ADF)  
on page 19.
Drum Error The corona wire on the drum unit 
needs to be cleaned. Clean the corona wire on the drum unit. (See 
Cleaning the corona wire
 on page 118.)
The drum unit has reached the 
end of its life. Replace the drum unit. (See 
Replacing the 
drum unit  on page 125.)
Error MessageCauseAction 
						

							Troubleshooting and routine maintenance105
B
Fuser ErrorThe temperature of fuser unit 
does not rise at a specified 
temperature within specified time. Do one of the following:
„ (MFC-7320 and MFC-7440N only)
Received fax messages still in memory 
will be lost when the machine is turned 
off. See  Transferring your faxes or Fax 
Journal report  on page 107 before 
disconnecting the machine so you will 
not lose any important messages.
Then, turn the power switch off, wait a 
few seconds, and then turn it on again. 
Leave the machine for 15 minutes with 
the power on.
„ (MFC-7840W only)
Turn the power switch off, wait a few 
seconds, and then turn it on again. Leave 
the machine for 15 minutes with the 
power on. The machine can be turned off 
for up to 4 days without losing faxes 
stored in the memory. (See  Transferring 
your faxes or Fax Journal report  
on page 107.)
The fuser unit is too hot.
Init Unable XX The machine has a mechanical 
problem. Do one of the following:
„ (MFC-7320 and MFC-7440N only)
See  Transferring your faxes or Fax 
Journal report  on page 107 before 
disconnecting the machine so you will 
not lose any important messages.
Then, disconnect the machine from the 
power for several minutes and then 
reconnect it.
„ (MFC-7840W only)
Disconnect the machine from the power 
for several minutes, then reconnect it. 
(The machine can be turned off for up to 
4 days without losing faxes stored in the 
memory. See   Transferring your faxes or 
Fax Journal report  on page 107.)
Jam Rear The paper is jammed in the back 
of the machine. (See 
Paper jams  on page 110.)
Jam Inside The paper is jammed inside the 
machine. (See 
Paper jams  on page 110.)
Jam Tray The paper is jammed in the paper 
tray of the machine. (See 
Paper jams  on page 110.)
No Paper The machine is out of paper or 
paper is not correctly loaded in 
the paper tray. Do one of the following:
„ Refill the paper in the paper tray, and 
then press  Start.
„ Remove the paper and load it again, and 
then press  Start.
Error MessageCauseAction 
						

							106
No Response/BusyThe number you dialled does not 
answer or is busy. Verify the number and try again.
Not Registered You tried to access a One Touch 
or Speed Dial number that is not 
programmed. Set up the One Touch or Speed Dial 
number.
(See 
Storing one touch dial numbers  
on page 52 and  Storing speed dial numbers  
on page 53.)
Out of Memory The machine’s memory is full. Fax sending or copy operation in 
progress
Do one of the following:
„ Press  Start to send or copy the scanned 
pages.
„ Press  Stop/Exit  and wait until the other 
operations in progress finish, and then try 
again.
„ Clear the data from the memory. (See 
Out of memory message  on page 38 or 
page 73.)
Print operation in process
Do one of the following: „ Reduce print resolution. (See  Advanced 
tab in the Software User’s Guide on the 
CD-ROM .)
„ Clear the faxes from the memory. (See 
Out of memory message  on page 73.)
Print Unable XX The machine has a mechanical 
problem. Do one of the following:
„ (MFC-7320 and MFC-7440N only)
See  Transferring your faxes or Fax 
Journal report  on page 107 before 
disconnecting the machine so you will 
not lose any im portant messages.
Then, disconnect the machine from the 
power for several minutes and then 
reconnect it.
„ (MFC-7840W only)
Disconnect the machine from the power 
for several minutes, then reconnect it. 
(The machine can be turned off for up to 
4 days without losing faxes stored in the 
memory. See  Transferring your faxes or 
Fax Journal report  on page 107.)
Error MessageCauseAction 
						

							Troubleshooting and routine maintenance107
B
Transferring your
 faxes or Fax 
Journal reportB
If the LCD shows:
„ Init Unable XX
„ Print Unable XX
„ Scan Unable XX
We recommend transfer ring your faxes to 
another fax machine or to your PC. (See 
Transferring faxes to another fax machine  
on page 107 or  Transferring faxes to your PC  
on page 108.)
You can also transfer the Fax Journal report 
to see if there are any faxes you need to 
transfer. (See  Transferring Fax Journal report 
to another fax machine  on page 108.)
Note
If there is an error message on the 
machine’s LCD, after the faxes have been 
transferred, disconnect the machine from 
the power source for several minutes, and 
then reconnect it.
 
Transferring faxes to another fax 
machine
B
If you have not set up your Station ID, you 
cannot enter fax transfer mode. (See  Setting 
your station ID in  the Quick Setup Guide .)
aPress Menu, 9, 0,  1.
Scan Unable XX The machine has a mechanical 
problem. Do one of the following:
„ (MFC-7320 and MFC-7440N only)
See  Transferring your faxes or Fax 
Journal report  on page 107 before 
disconnecting the machine so you will 
not lose any important messages.
Then, disconnect the machine from the 
power for several minutes and then 
reconnect it.
„ (MFC-7840W only)
Disconnect the machine from the power 
for several minutes, then reconnect it. 
(The machine can be turned off for up to 
4 days without losing faxes stored in the 
memory. See  Transferring your faxes or 
Fax Journal report  on page 107.)
Toner Life End The drum unit and toner cartridge 
assembly is not installed 
correctly, or the toner cartridge is 
used up and printing is not 
possible. Do one of the following:
„ Re-install the toner cartridge and drum 
unit assembly.
„ Replace the empty toner cartridge with a 
new one. (See  Replacing a toner 
cartridge  on page 122.)
Toner Low If the LCD shows Toner Low, 
you can still print; however, the 
machine is telling you that the 
toner cartridge is near the end of 
its life and the toner will soon 
need replacing. Order a new toner cartridge now.
Error MessageCauseAction 
						

							108
bDo one of the following:„ If the LCD shows  No Data, there 
are no faxes left  in the machine’s 
memory.
Press  Stop/Exit .
„ Enter the fax number to which faxes 
will be forwarded.
cPress  Start.
Transferring faxes to your PCB
You can transfer the  faxes from your 
machine’s memory to your PC.
aMake sure that you have installed 
MFL-Pro Suite  on your PC, and then 
turn on  PC-Fax Receiving  on the PC. 
(For details about PC Fax Receive, see 
PC-FAX receiving  in the Software 
User’s Guide on the CD-ROM .)
bMake sure that you have set 
PC Fax Receive on the machine. 
(See  PC fax receive on page 57.)
If faxes are in the machine’s memory 
when you set up PC Fax Receive, the 
LCD will ask if you want to transfer the 
faxes to your PC.
cDo one of the following:
„ To transfer all faxes to your PC, 
press  1. You will be asked if you want 
a backup print.
„ To exit and leave the faxes in the 
memory, press  2.
dPress  Stop/Exit .
Transferring Fax Journal report to 
another fax machine
B
If you have not set up your Station ID, you 
cannot enter fax transfer mode. (See  Setting 
your station ID in the Quick Setup Guide .)
aPress Menu, 9, 0,  2.
bEnter the fax number to which the Fax 
Journal report will be forwarded.
cPress  Start. 
						

							Troubleshooting and routine maintenance109
B
Document jamsB
If the document is jammed, follow the steps 
below.
Note
After removing a jammed document, 
check that no paper scraps are left in the 
machine that could cause another jam.
 
Document is jammed in the top of the 
ADF unit
B
aTake out any paper from the ADF that is 
not jammed.
bOpen the ADF cover.
cPull the jammed document out to the 
left.
 
dClose the ADF cover.
ePress Stop/Exit .
Document is jammed under the 
document cover
B
aTake out any paper from the ADF that is 
not jammed.
bLift the document cover.
cPull the jammed document out to the 
right.
 
dClose the document cover.
ePress Stop/Exit .
Document is jammed at the output 
tray
B
aPull the jammed document out to the 
right.
 
bPress Stop/Exit . 
						

							110
Paper jamsB
To clear paper jams, please follow the steps 
in this section.
Note
• Please confirm that you have installed both a toner cartridge and a drum unit in 
the machine. If you have not installed a 
drum unit or have installed the drum unit 
incorrectly, then this may cause a paper 
jam in your Brother machine.
• If the error message remains, open and  close the front cover and fuser cover firmly 
to reset the machine.
 
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.
 
 
 
CAUTION 
To prevent damage to the machine caused 
by static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
 
Paper is jammed inside the machineB
aOpen the front cover.  
bSlowly take out the drum unit and toner 
cartridge assembly. The jammed paper 
will be pulled out with  the toner cartridge 
and drum unit assembly.