Brother Mfc 790cw User Manual

							
Troubleshooting and Routine Maintenance165
B
Cleaning the machine’s 
printer platenB
WARNING 
Be sure to unplug the machine from the AC 
power outlet before cleaning the printer 
platen (1).
 
aLift the scanner cover until it locks 
securely into the open position.
bClean the machine’s printer platen (1) 
and the area around it, wiping off any 
scattered ink with a soft, dry lint-free 
cloth.
 
Cleaning the paper pick-up 
rollerB
aPull the paper tray completely out of the 
machine.
bUnplug the machine from the AC power 
outlet and open the Jam Clear Cover (1) 
at the back of the machine.
 
cClean the Paper Pick-up Roller (1) with 
isopropyl alcohol on a cotton swab.
 
dClose the Jam Clear Cover.
Make sure the cover is closed properly.
ePut the paper tray firmly back in the 
machine.
fRe-connect the power cord.
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Cleaning the print headB
To maintain good print quality, the machine 
will automatically clean the print head. You 
can start the cleaning process manually if 
there is a print quality problem.
Clean the print head and ink cartridges if you 
get a horizontal line or blank text in the text or 
graphics on your printed pages. You can 
clean Black only, three colors at a time 
(Cyan/Yellow/Magenta), or all four colors at 
once.
Cleaning the print head consumes ink. 
Cleaning too often uses ink unnecessarily.
CAUTION 
DO NOT touch the print head. Touching the 
print head may cause permanent damage 
and may void the print heads warranty.
 
aPress .
bPress Cleaning .
cPress Black , Color  or All .
The machine cleans the print head. 
When cleaning is finished, the machine 
will go back to the Ready screen 
automatically.
Note
If you clean the print head at least five 
times and the print has not improved, try 
installing a new Genuine Brother Brand 
replacement cartridge for each problem 
color. Try cleaning the print head again up 
to five more times. If the print has not 
improved call Brother Customer Service. 
(See  Brother numbers  on page i.)
 
Checking the print qualityB
If faded or streaked colors and text appear on 
your output, some of the nozzles may be 
clogged. You can check this by printing the 
Print Quality Check Sheet and looking at the 
nozzle check pattern.
aPress .
bPress Test Print .
cPress Print Quality .
dPress Color Start .
The machine begins printing the Print 
Quality Check Sheet.
eCheck the quality of the four color blocks 
on the sheet.
fThe LCD asks you if the print quality is 
OK.
Do one of the following:
„ If all lines are clear and visible, press 
Yes  to finish the Print Quality check 
and go to step j.
„ If you can see missing short lines as 
shown below, press  No to choose 
No .
gThe LCD asks you if the print quality is 
OK for black and three colors.
Press  Yes or No.
hThe LCD asks you if you want to start 
cleaning.
Press  Color Start .
The machine starts cleaning the print 
head.
OK Poor
   
 
						

							
Troubleshooting and Routine Maintenance167
B
iAfter cleaning is finished, press 
Color Start.
The machine starts printing the Print 
Quality Check Sheet again and then 
return to step e. 
jPress  Stop/Exit .
If you repeat this procedure at least five 
times and the print quality is still poor, 
replace the ink cartridge for the clogged 
color. 
After replacing the ink cartridge, check 
the print quality. If the problem still 
exists, repeat the cleaning and test print 
procedures at least five times for the 
new ink cartridge. If ink is still missing, 
call Brother Customer Service. (See 
Brother numbers  on page i.)
CAUTION 
DO NOT touch the print head. Touching the 
print head may cause permanent damage 
and may void the print heads warranty.
 
Note
 
Checking the print alignmentB
You may need to adjust the print alignment 
after transporting the machine, or if your 
printed text becomes blurred or images 
become faded.
aPress .
bPress Test Print .
cPress Alignment .
dPress Black Start  or Color Start .
The machine starts printing the 
Alignment Check Sheet.
eCheck the 600 dpi and 1200 dpi test 
prints to see if number 5 most closely 
matches number 0. 
fDo one of the following:
„ If the number 5 samples of both the 
600 dpi and 1200 dpi test prints are 
the best matches, press  Yes to finish 
the Alignment Check and go to 
step i.
„ If another test print number is a 
better match for either 600 dpi or 
1200 dpi, press  No to choose it.
gFor 600 dpi, press the number of the test 
print that most closely matches the 
number 0 sample (1-8).
hFor 1200 dpi, press the number of the 
test print that most closely matches the 
number 0 sample (1-8).
iPress  Stop/Exit .
 
i
 
When a print head 
nozzle is clogged 
the printed 
sample looks like 
this. After the print 
head nozzle is 
cleaned, the 
horizontal lines 
are gone.
 
						

							
168
Checking the ink volumeB
Although an ink volume icon appears on the 
LCD, you can use the ink menu to see a large 
graph showing the ink that is left in each 
cartridge.
aPress .
bPress Ink Volume .
The LCD shows the ink volume.
cPress  Stop/Exit .
Note
You can check the ink volume from your 
computer. (See  Printing for Windows
® or 
Printing and Faxing  for Macintosh
® in the 
Software User’s Guide on the CD-ROM.)
 
Uninstalling and installing the 
handset and handset cradle 
(MFC-790CW only)B
If you do not use the handset you can remove 
the handset and handset cradle.
Uninstalling the handset and handset 
cradle
B
aUnplug the curled handset cord from the 
machine.
 
bPull the tab (1) back and hold it in 
position as you push the cradle (2) to the 
back of the machine.
 
cAttach the side cover. 
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Troubleshooting and Routine Maintenance169
B
Installing the handset and handset 
cradle
B
aRemove the side cover. 
Note
If you cannot open the cover with your 
hand, use a coin to open it.
 
bAlign the recessed arrows on the cradle 
with those on the machine, and then 
slide the cradle toward the front of the 
machine until it clicks into place.
 
cConnect the curled handset cord to the 
machine.
 
 
						

							
170
Machine InformationB
Checking the serial numberB
You can see the machine’s serial number on 
the LCD.
aPress MENU.
bPress  aor b to display 
Machine Info.
cPress  Machine Info.
dPress Stop/Exit .
Packing and shipping 
the machine
B
When you transport the machine, use the 
packing materials that came with your 
machine. If you do not pack the machine 
properly, you could void your warranty.
CAUTION 
It is important to allow the machine to ‘park’ 
the print head after a print job. Listen 
carefully to the machine before unplugging 
it to make sure that all mechanical noise 
has stopped. Not allowing the machine to 
finish this parking process may lead to print 
problems and possible damage to the print 
head.
 
aOpen the ink cartridge cover.
bPress the ink release lever to release 
the ink cartridge and take out the ink 
cartridges. (See  Replacing the ink 
cartridges  on page 161.)
cInstall the green protective part and then 
close the ink cartridge cover.
 
 
						

							
Troubleshooting and Routine Maintenance171
B
CAUTION 
Make sure that the plastic tabs on both 
sides of the green protective part (1) have 
securely clicked into place (2).
  
If you are not able to find the green 
protective part, DO NOT remove the ink 
cartridges before shipping. It is essential 
that the machine be shipped with either the 
green protective part or the ink cartridges in 
position. Shipping without them will cause 
damage to your machine and may void your 
warranty.
 
dLift the machine from the front and hook 
the tab of the green protective part into 
the keyed opening (1) on the bottom of 
the paper tray. Then latch the protective 
part over the raised portion of the paper 
tray (2).
 
eUnplug the machine from the telephone 
wall jack and take the telephone line 
cord out of the machine.
fUnplug the machine from the AC power 
outlet.
gUsing both hands, use the plastic tabs 
on both sides of the machine to lift the 
scanner cover until it locks securely into 
the open position. Then unplug the 
interface cable from the machine, if it is 
connected.
   
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172
hLift the scanner cover (1) to release the 
lock. Gently push the scanner cover 
support down (2) and close the scanner 
cover (3) using both hands.
 
iWrap the machine in the bag. 
jPack the machine and the printed 
materials in the original carton with the 
original packing material as shown in 
the illustration. 
Do not pack the used ink cartridges in 
the carton.
Note
If you are returning your machine to 
Brother as part of the Exchange Service, 
pack only the machine. Keep all separate 
parts and printed materials to use with 
your ‘Exchange’ machine.
   
kClose the carton and tape it shut. 
1
23
(MFC-790CW)
(MFC-990CW)
 
						

							
173
C
C
On-screen 
programming
C
Your machine is designed to be easy to 
operate with LCD on-screen programming 
using the menu keys. User-friendly 
programming helps you take full advantage of 
all the menu selections your machine has to 
offer.
Since your programming is done on the LCD, 
we have created step-by-step on-screen 
instructions to help you program your 
machine. All you need to do is follow the 
instructions as they guide you through the 
menu selections and programming options.
Menu tableC
You can program your machine by using the 
Menu table that begins on page 174. These 
pages list the menu selections and options.
Memory storageC
Even if there is a power failure, you will not 
lose the settings you have chosen using the 
Menu key because they are stored 
permanently. Also, you will not lose your 
settings in the PhotoCapture, Fax and Copy 
mode key menus if you have chosen 
Set New Default. You may have to reset 
the date and time.
Note
During a power failure the machine will 
retain messages that are in the memory 
for approximately 24 hours.
 
Mode and menu keysC
Menu and FeaturesC
 
Access the main menu.
 
Access the mode and its menu of 
temporary settings.
 
Stop the current operation.
MENU
 
						

							
174
Menu tableC
The menu table will help you understand the menu selections and options that are found in the 
machines programs. The factory settings are shown in Bold with an asterisk.
MENU ()
Level1 Level2 Level3 Options Descriptions Page
General Setup Mode Timer —Off
0 Sec
30 Secs
1 Min
2 Mins*
5 Mins Sets the time to return to 
Fax mode.
25
Paper Type —Plain Paper*
Inkjet Paper
Brother BP71
Other Glossy
Transparency Sets the type of paper in 
the paper tray.
25
Paper Size —Letter*
Legal
A4
A5
4x6 Sets the size of the paper 
in the paper tray.
26
Volume Ring Off
Low
Med*
High Adjusts the ring volume. 26
Beeper Off
Low*
Med
High Adjusts the volume level 
of the beeper.
27
Speaker Off
Low
Med*
High Adjusts the volume level 
of the speaker.
27
 The factory settings are shown in Bold with an asterisk.
MENU