120
Improving the print quality B
Examples of poor print 
quality
Recommendation
 
White lines across the page
 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 print media on page 16.)
 Make sure that you choose the appropriate media type in the printer 
driver or in the machine’s Paper Type menu setting. (See Acceptable 
paper and other print media on page 16 and Basic tab in the Software 
User’s Guide on the CD-ROM.)
 The problem may disappear by itself. Print multiple pages to clear this 
problem, especially if the machine has not been used for a long time.
 The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum unit on page 149.)
 
White lines down the page
 Wipe the laser scanner windows with a soft cloth. (See Cleaning the 
laser scanner window on page 139.)
 Make sure that a torn sheet of paper is not inside the machine 
covering the scanner window.
 The toner cartridge may be damaged. Put in a new toner cartridge. 
(See Replacing a toner cartridge on page 146.)
 The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum unit on page 149.)
 
Hollow print
 Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other print media on page 16.) 
 Choose Thick paper mode in the printer driver, choose Thick in the 
machine’s Paper Type menu setting or use thinner paper than you 
are currently using. (See Paper type on page 23 and Basic tab in the 
Software User’s Guide on the CD-ROM.)
 Check the machine’s environment. Conditions such as high humidity 
can cause hollow print. (See Choosing a location on page 94.)
 The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum unit on page 149.)
 
Grey background
 Make sure that you use paper that meets our specifications. (See 
Acceptable paper and other print media on page 16.) 
 Check the machine’s environment. Conditions such as high 
temperatures and high humidity can increase the amount of 
background shading. (See Choosing a location on page 94.)
 The toner cartridge may be damaged. Put in a new toner cartridge. 
(See Replacing a toner cartridge on page 146.)
 The drum unit may be damaged. Put in a new drum unit. (See 
Replacing the drum unit on page 149.)
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abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234