Brother DCP 9040CN User Manual

Troubleshooting and routine maintenance
59
C
Uneven density appears 
periodically across the page
 
„Identify the color that is uneven and put in a new toner cartridge for 
that color. (See Replacing a toner cartridge on page 101.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum unit on page 106.)
„Make sure that the fuser unit is installed properly.
Missing image at edge„Make sure that the toner cartridges are installed properly. (See 
Replacing a toner cartridge on page...

60
Offset image
 
„Check the machine’s environment. Conditions such as high 
temperatures and high humidity can cause this problem. (See 
Choosing a location on page 36.)
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other media on page 12.) 
„Make sure that you choose the proper media type in the printer driver 
or in the machine
’s Paper Type menu setting. (See Acceptable paper 
and other media on page 12 and Basic tab in the Software User’s 
Guide on the...

Troubleshooting and routine maintenance
61
C
Curled or waved
 
„Make sure that you choose the proper media type in the printer driver 
or in the machine
’s Paper Type menu setting. (See Acceptable paper 
and other media on page 12 and Basic tab in the Software User’s 
Guide on the CD-ROM.)
„Check the paper type and quality. High temperatures and high 
humidity will cause paper to curl.
„If you do not use the machine often, the paper may have been in the 
paper tray too long. Turn over the stack of paper...

62
Envelope creases
 aOpen the back cover.
bPull down the two gray levers, one on the left-hand side and one on 
the right-hand side to the envelope position, as shown in the 
illustration below.
 
cClose the back cover and re-send the print job.
Note
When you have finished printing, open the back cover and reset the 
two gray levers back to their original position.
 
Examples of poor print 
qualityRecommendation
ABCDEFG
EFGHIJKLMN
 

Troubleshooting and routine maintenance
63
C
White lines or ribbing down the 
page on duplex print
 
Note
Position B is only for duplex 
printing with recycled paper 
when the temperature and 
humidity are low.
 
„Choose Thin Paper mode in the printer driver and re-send the print 
job.
If the problem is not solved after printing a few pages, follow these 
steps:
aOpen the back cover.
bPull down the two grey levers, one on the left-hand side and one 
on the right-hand side, to position B as shown in the...

64
Toner scatter or toner stain on 
the edge of duplex pages
 
CAUTION 
We recommend that you place the drum unit and toner cartridges on a 
clean, flat surface with a piece of disposable paper underneath them in 
case you accidentally spill or scatter toner.
  DO NOT touch the surface of the photosensitive drum.
 
Take all the toner cartridges out of the drum unit and turn the drum 
unit over. Wipe the toner on the edge of drum unit with a dry lint free 
soft cloth as shown in the illustration....

Troubleshooting and routine maintenance
65
C
Error and maintenance messagesC
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 
show the appropriate message. The most common error and maintenance message are shown 
below.
Error MessageCauseAction
CalibrateCalibration failed. Press Black Start or Color Start and try it 
again.
Do one of the following:
„Turn off the...

66
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 
isnt blocked by something.
If the fan is spinning, remove any obstacles 
that surround the exhaust outlet, and then...

Troubleshooting and routine maintenance
67
C
Jam RearThe paper is jammed in the back 
of the machine.(See Paper jams on page 70.)
Jam InsideThe paper is jammed inside the 
machine.(See Paper jams on page 70.)
JamMPTrayThe paper is jammed in the MP 
tray of the machine.(See Paper jams on page 70.)
JamTray1The paper is jammed in the paper 
tray of the machine.(See Paper jams on page 70.)
Laser Unit EndIt is time to replace the laser unit. Call Brother Customer Service to replace the 
laser unit.
Low...

68
RegistrationRegistration failed. Press Black Start or Color Start and try 
again.
Do one of the following:
„Try Manual Registration, Menu, 3, 7. (See 
Manual Registration on the Software 
User’s Guide on the CD-ROM.)
„Put in a new belt unit. (See Replacing the 
belt unit on page 112.)
„Put in a new drum unit. (See Replacing the 
drum unit on page 106.)
„Replace the empty toner cartridge with a 
new one. (See Replacing a toner cartridge 
on page 101.)
„Turn off the machine’s power switch. Wait 
a few...