Konica Minolta bizhub 20 - Manual (Page 126)

Troubleshooting and routine maintenance
117
C
Improving the print quality
C
Examples of poor print
quality Recommendation
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 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 12.)
 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 12 and Basic tab in the Software
User’s Guide on the CD/DVD-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 145.)
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 Wipe the laser scanner windows with a dry, lint-free soft cloth. (See
Cleaning the laser scanner window on page 138.)
 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 143.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 145.)
Hollow print
 Make sure that you use paper that meets our specifications. (See
Acceptable paper and other print media on page 12.)
 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 19 and Basic tab in the
Software User’s Guide on the CD/DVD-ROM.)
 Check the machine ’ s environment. Conditions such as high humidity
can cause hollow print. (See Choosing a location on page 92.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 145.)
Gray background
 Make sure that you use paper that meets our specifications. (See
Acceptable paper and other print media on page 12.)
 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 92.)
 The toner cartridge may be damaged. Put in a new toner cartridge.
(See Replacing a toner cartridge on page 143.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 145.)
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