288 Troubleshooting
screen
Print Quality Problems
The background is dark or dirty
Cause What to do
Printed colors do not exactly 
match the colors on your 
monitor, since printers and 
monitors use different color 
systems: monitors use RGB 
(red, green, and blue), while 
printers typically use CMYK 
(cyan, magenta, yellow, and 
black). 
Although it is difficult to match colors 
perfectly, selecting the printer driver’s 
ICM setting (for Windows Me, 98, 95, 
XP, or 2000) or ColorSync setting (for 
Macintosh) can improve color matching 
between different devices. For details, 
see “Using the predefined settings” on 
page 51 for Windows, and “Using the 
predefined settings” on page 111 for 
Macintosh.
For Macintosh, the System 
Profile setting is not in use.
To apply ColorSync properly, your 
input device and the application must 
support ColorSync, and a System 
Profile must be used for your monitor.
PhotoEnhance4 may be 
selected in the printer driver.
The PhotoEnhance4 feature corrects the 
contrast and brightness of the original 
image data for printing images more 
vivid. Deselect the PhotoEhance4 
feature if necessary.
Cause What to do
There may be a problem with 
the photoconductor unit. 
Replace the photoconductor unit. See 
“Photoconductor Unit” on page 246.