Brother MFC 9450CDN User Manual

							Troubleshooting and routine maintenance
111
C
Improving the print qualityC
If you have a print quality problem, print a test page first (Menu, 4, 2, 3). If the printout looks good, 
the problem is probably not the machine. Check the interface cable or try the machine on another 
computer.
Note
You can resolve a print quality problem by replacing a toner cartridge with a new one when the 
LCD shows the Toner Life End message.
 
Examples of poor print 
qualityRecommendation
White lines or bands or ribbing 
across the page
 
„Make sure that the machine is on a solid level surface.
„Make sure that the toner cartridges are installed properly. (See 
Replacing a toner cartridgeon page 159.)
„Shake the toner cartridges gently.
„Make sure that the drum unit is installed properly. (See Replacing the 
drum uniton page 164.)
„Make sure that you use paper that meets our specifications. A rough 
surfaced paper or thick print media can cause the problem. (See 
Acceptable paper and other mediaon page 9.)
„Clean the laser scanner windows with a soft cloth. (See Cleaning the 
laser scanner windowson page 142.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
Colours are light or unclear on 
the whole page.
 
„Make sure that the recommended paper was used. 
„Change the paper to freshly unpacked paper.
„Make sure that the front cover is closed properly.
„Shake the toner cartridges gently.
„Clean the laser scanner windows with a soft cloth. (See Cleaning the 
laser scanner windowson page 142.)
„Turn off Toner Save. (See Toner saveon page 24.)
White streaks or bands down 
the page
 
„Shake the toner cartridges gently.
„Clean the laser scanner windows with a soft cloth. (See Cleaning the 
laser scanner windowson page 142.)
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
 
						

							112
Coloured streaks or bands 
down the page
 
„One of the toner cartridges may be damaged. Replace the toner 
cartridge that matches the colour of the streak or bond. (See 
Replacing a toner cartridgeon page 159.)
„Clean all four corona wires (one for each colour) of the drum unit by 
sliding the green tab. (See Cleaning the corona wireson page 146.)
„Make sure each corona wire’s green tab is at the home position (b).
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„The fuser unit may have a smudge mark. Call Brother or your dealer 
for service.
Coloured lines across the page
 
„One of the toner cartridges may be damaged. Replace the toner 
cartridge that matches the colour of the line. (See Replacing a toner 
cartridgeon page 159.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„Clean all four corona wires (one for each colour) of the drum unit by 
sliding the green tab. (See Cleaning the corona wireson page 146.)
„Clean the laser scanner windows with a soft cloth. (See Cleaning the 
laser scanner windowson page 142.)
White spots or hollow print
 
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
„Make sure that the recommended paper was used. 
„Choose Thick paper mode in the printer driver or in the machine
’s 
Paper Type menu setting, or use thinner paper than you are currently 
using. (See Paper typeon page 20 and Basic tab in the Software 
User’s Guide on the CD-ROM.)
„Change the paper to fresh, unopened paper.
„Check the machine
’s environment. Conditions such as high humidity 
can cause hollow print. (See Choosing a locationon page 90.)
„Clean all four corona wires (one for each colour) of the drum unit by 
sliding the green tab. (See Cleaning the corona wireson page 146.) 
If the print quality has not improved, put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„Clean the drum unit. (See Cleaning the drum uniton page 149.)
Completely blank or some 
colours are missing.
 
„Make sure that the toner cartridges are installed properly. (See 
Replacing a toner cartridgeon page 159.)
„One of the toner cartridges may be damaged. Identify the missing 
colour and put in a new toner cartridge for the colour with the white 
line. (See Replacing a toner cartridgeon page 159.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
 
						

							Troubleshooting and routine maintenance
113
C
Coloured spots at 75 mm
 
„Dust, paper powder, glue, and so on may stick to the surface of the 
photosensitive drum (OPC) and cause black or white spots to appear 
on printed documents.
„Make a few copies of a blank, white sheet of paper. (See Making 
multiple copieson page 70.)
„If you still see the spots on printed documents after making multiple 
copies, clean the drum unit. (See Cleaning the drum uniton 
page 149.)
„If the print quality still has not improved you need to install a new 
drum. (See Replacing the drum uniton page 164.)
Toner scatter or toner stain
 
„Check the machine’s environment. Conditions such as high humidity 
and high temperatures may cause this print quality problem. (See 
Choosing a locationon page 90.)
„Make sure that you use paper that meets our specifications. Rough-
surfaced paper may cause the problem. (See Acceptable paper and 
other mediaon page 9.)
„Install a new toner cartridge for the colour causing the problem. (See 
Replacing a toner cartridgeon page 159.)
„Clean the corona wires and the drum unit for the colour causing the 
problem. (See Cleaning the corona wireson page 146 and Cleaning 
the drum uniton page 149.) If the print quality has not improved, put 
in a new drum unit. (See Replacing the drum uniton page 164.)
Grey or coloured background
 
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
„Check the machine’s environment. Conditions such as high 
temperatures and high humidity can increase the amount of 
background shading. (See Choosing a locationon page 90.)
„Install a new toner cartridge for the colour causing the problem. (See 
Replacing a toner cartridgeon page 159.)
„Clean the corona wires of the drum unit for the colour causing the 
problem. (See Cleaning the corona wireson page 146.) If the print 
quality has not improved, put in a new drum unit. (See Replacing the 
drum uniton page 164.)
Page skewed
 
„Make sure the paper or other print media is loaded properly in the 
paper tray and that the guides are not too tight or too loose against 
the paper stack.
„Set the paper guides correctly.
„The paper tray may be too full.
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.)
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
75 mm
75 mm
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ.
 0123456789. abcdefghijklmnopqrstuvwxy
z.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 
0123456789. abcdefghijklmnopqrstuvwxy
z.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 
0123456789. abcdefghijklmnopqrstuvwxy
z.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
. 0123456789. abcdefghijklmnopqrstuvw
xyz.
 
						

							114
Ghost
 
„Make sure that you use paper that meets our specifications. Rough-
surfaced paper or thick paper may cause the problem. (See 
Acceptable paper and other mediaon page 9.)
„Make sure that you choose the correct media type in the printer driver 
or in the machine’s Paper Type menu setting. (See Acceptable paper 
and other mediaon page 9 and Basic tab in the Software User’s 
Guide on the CD-ROM.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
The colour of your printouts are 
not what you expected.„Make sure that the toner cartridges are installed properly. (See 
Replacing a toner cartridgeon page 159.)
„Make sure that the toner cartridges are not empty. (See Toner life end 
messageon page 159.)
„Make sure that the drum unit is installed properly. (See Replacing the 
drum uniton page 164.)
„Make sure that the belt unit is installed properly. (See Replacing the 
belt uniton page 171.)
„Perform the calibration by using the control panel. 
Press Menu, 4, 5.
aPress OK to select Calibrate.
bPress 1 to select Yes. 
(For more information, see Software User’s Guide on the CD-ROM.)
„Adjust the colour by using the custom setting in the printer driver. 
Colours the machine can print and colours you see on a monitor are 
different. The machine may not be able to reproduce the colours on 
your monitor.
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„Put in a new belt unit. (See Replacing the belt uniton page 171.)
All one colour„Clean the corona wires of the drum unit for the colour causing the 
problem. (See Cleaning the corona wireson page 146.) If the print 
quality has not improved, put in a new drum unit. (See Replacing the 
drum uniton page 164.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
Examples of poor print 
qualityRecommendation
 
						

							Troubleshooting and routine maintenance
115
C
Colour misregistration
 
„Make sure that the drum unit is installed properly. (See Replacing the 
drum uniton page 164.)
„Make sure that the belt unit is installed properly. (See Replacing the 
belt uniton page 171.)
„Make sure that the waste toner box is installed properly. (See 
Replacing the waste toner boxon page 176.)
„Perform the auto colour registration by using the control panel. Press 
Menu, 4, 6, 1.
or
„Perform the manual colour registration by using the control panel.
aPrint the correction chart by using the control panel. Press 
Menu, 4, 7, 1.
bEnter the correction value on the chart. Press Menu, 4, 7, 2.
If the colour misregistration is not corrected after registering the 
colour manually, take all the toner cartridges out of the drum unit and 
turn the drum unit over, then make sure that four drum unit gears are 
in the home position. The home position of each drum can be 
identified by matching the number on the drum unit gear to the same 
number on the side of the drum unit as shown in the illustration.
 
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„Put in a new belt unit. (See Replacing the belt uniton page 171.)
„Put in a new waste toner box. (See Replacing the waste toner boxon 
page 176.)
„If solid areas of colour or images have cyan, magenta or yellow 
fringes, you can use the auto-registration feature to correct the 
problem.
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
 
						

							116
Uneven density appears 
periodically across the page
 
„Identify the colour that is uneven and put in a new toner cartridge for 
that colour.  (See Replacing a toner cartridgeon page 159.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
„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 cartridgeon page 159.)
„Make sure that the drum unit is installed properly. (See Replacing the 
drum uniton page 164.)
„One of the toner cartridges may be damaged. Identify the missing 
colour and put in a new toner cartridge for the colour with the white 
line. (See Replacing a toner cartridgeon page 159.)
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
Missing image at thin line
„If you are using a Windows
® printer driver, open Properties window, 
and then click Printing Preferences. Choose Advanced tab, Device 
Options, Print Setting, and then check the Improve pattern 
printing or Improve Thin Line boxes.
Wrinkle
 
„Change to the recommended type of paper. (See Recommended 
paperon page 9.) 
„Check the paper type and quality. (See Acceptable paper and other 
mediaon page 9.)
„Make sure that the back cover is closed properly.
„Make sure that paper is loaded properly.
„Make sure that you choose the correct media type in the printer driver 
or in the machine
’s Paper Type menu setting. (See Acceptable paper 
and other mediaon page 9 and Basic tab in the Software User’s 
Guide on the CD-ROM.)
„Turn over the stack of paper in the tray or rotate the paper 180° in the 
input tray.
„Make sure that the drum unit is installed properly. (See Replacing the 
drum uniton page 164.)
„Make sure that the fuser unit is installed properly.
„If the problem continues, call your Brother dealer.
Insufficient gloss„Change to the recommended type of paper. (See Recommended 
paperon page 9.) 
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
 
						

							Troubleshooting and routine maintenance
117
C
Offset image
 
„Check the machine’s environment. Conditions such as high 
temperatures and humidity can cause this problem. (See Choosing a 
locationon page 90.)
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
„Make sure that you choose the correct media type in the printer driver 
or in the machine
’s Paper Type menu setting. (See Acceptable paper 
and other mediaon page 9 and Basic tab in the Software User’s 
Guide on the CD-ROM.)
„Change to the recommended type of paper. (See Recommended 
paperon page 9.) 
„The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum uniton page 164.)
Poor fixing
 
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
„Make sure that you choose the correct media type in the printer driver 
or in the machine
’s Paper Type menu setting. (See Acceptable paper 
and other mediaon page 9 and Basic tab in the Software User’s 
Guide on the CD-ROM.)
„Make sure that the release lever of the fuser unit is in the closed 
position.
„If the problem continues, call your Brother dealer.
Poor fixing when printed on 
thick paper„Choose Thick paper mode in the printer driver or in the machine
’s 
Paper Type menu setting. (See Paper typeon page 20 and Basic tab 
in the Software User’s Guide on the CD-ROM.)
„Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other mediaon page 9.) 
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
 
						

							118
Curled or wave
 
„Make sure that you choose the correct media type in the printer driver 
or in the machine’s Paper Type menu setting. (See Acceptable paper 
and other mediaon page 9 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 in the paper tray. 
Also, fan the paper stack and then rotate the paper 180° in the paper 
tray.
„Follow these steps:
aOpen the back cover.
bPush the grey lever to the right as shown below. 
cClose the back cover and re-send the print job.
Note
When you have finished printing, open the back cover and reset the 
lever back to the original position.
 
Examples of poor print 
qualityRecommendation
 
						

							Troubleshooting and routine maintenance
119
C
Envelope creases
 aOpen the back cover.
bPull down the two grey 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 grey levers back to the original position.
 
Examples of poor print 
qualityRecommendation
ABCDEFGEFGHIJKLMN
 
						

							120
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 illustration 
below.
 
cClose the back cover.
dChoose Plain Paper mode in the printer driver and re-send the 
print job.
eIf the problem is not solved after printing a few pages, choose 
Thin Paper mode in the printer driver and re-send the print job.
Note
When you have finished printing, open the back cover and reset the 
two grey levers back to the original position.
 
„Use thicker paper than you are now using.
Examples of poor print 
qualityRecommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.