Brother MFC 990CW User Manual

Troubleshooting and Routine Maintenance159
B
fLift the scanner cover (1) from the front 
side of the machine until it locks 
securely into the open position. Make 
sure that there is no jammed paper left 
inside the machine.
 
Note
• If the paper is jammed under the print head, unplug the machine from the power 
source, and then move the print head to 
take out the paper.
• If the print head is at the right corner as  shown in the illustration, you cannot move 
the print head. Press Stop/Exit until the...

160
Routine maintenanceB
Replacing the ink cartridgesB
Your machine is equipped with an ink dot 
counter. The ink dot counter automatically 
monitors the level of ink in each of the 
4 cartridges. When the machine detects an 
ink cartridge is running out of ink, the machine 
will tell you with a message on the LCD.
Note
For example, when one of the ink 
cartridge is nearly empty, the LCD will 
display Ink low (name of colour).
You should purchase a replacement 
cartridge in preparation for when the...

Troubleshooting and Routine Maintenance161
B
aOpen the ink cartridge cover.
If one or more ink cartridges are empty, 
for example Black, the LCD shows 
B&W Print Only or  Cannot Print.
bPress the lock release lever as shown to 
release the cartridge indicated on the 
LCD. Remove the cartridge from the 
machine.
 
 
cOpen the new ink cartridge bag for the 
colour shown on the LCD, and then take 
out the ink cartridge.
dTurn the green knob on the protective 
yellow cap clockwise until it clicks to 
release...

162
fGently push the ink cartridge in until it 
clicks, and then close the ink cartridge 
cover.
 
gThe machine will automatically reset the 
ink dot counter.
Note
• If you replaced an ink cartridge, the LCD may ask you to verify that it was a brand 
new one (for example,  Did You Change 
Black). For each new cartridge you 
installed, press  Yes to automatically reset 
the ink dot counter for that colour. If the ink 
cartridge you installed is not a brand new 
one, be sure to press  No.
• If the LCD...

Troubleshooting and Routine Maintenance163
B
Cleaning the outside of the 
machineB
Clean the Touchscreen as follows:
CAUTION 
Turn off the power switch when you clean 
the Touchscreen.
  
DO NOT use any type of liquid cleaners 
(including ethanol).
 
aClean the Touchscreen with a dry soft 
cloth.
 
Clean the outside of the machine as 
follows:
CAUTION 
Use neutral detergents. Cleaning with 
volatile liquids such as thinner or benzine 
will damage the outside surface of the 
machine.
  
DO NOT use...

164
Cleaning the scanner glassB
aLift the document cover (1). Clean the 
scanner glass (2) and the white 
plastic (3) with a soft lint-free cloth 
moistened with a non-flammable glass 
cleaner.
 
bIn the ADF unit, clean the white bar (1) 
and the glass strip (2) with a lint-free 
cloth moistened with a non-flammable 
glass cleaner.
 
Note
In addition to cleaning the glass strip with 
a non-flammable glass cleaner, run your 
finger tip over the glass strip to see if you 
can feel anything on it. If you...

Troubleshooting and Routine Maintenance165
B
Cleaning the paper pick-up 
rollerB
aPull the paper tray completely out of the 
machine.
bUnplug the machine from the electrical 
socket 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 correctly.
ePut the paper tray firmly back in the 
machine.
fRe-connect the power cord.
Cleaning the print headB
To maintain...

166
Checking the print qualityB
If faded or streaked colours 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 Colour Start .
The machine begins printing the Print 
Quality Check Sheet.
eCheck the quality of the four colour 
blocks on the sheet.
fThe LCD asks you if the print quality is 
OK.
Do one of the following:
„ If all...

Troubleshooting and Routine Maintenance167
B
Checking the print alignmentB
You may need to adjust the print alignment 
after transporting the machine, if your printed 
text becomes blurred or images become 
faded.
aPress .
bPress Test Print .
cPress Alignment.
dPress Mono Start or  Colour 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...

168
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. 
Installing the handset and handset 
cradle
B
aRemove the side cover. 
Note
If you cannot open the cover with your...