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C7350/7550 User’s Guide: Troubleshooting • 525
Print Quality Problems
Blurred letter edges
Possible cause Remedy
LED is dirty. Clean LED with lens cleaner or soft tissue.
See “Cleaning the LED heads” on page 502.
Cannot print desired
color because toner
is low.
Replace toner cartridge.
See “Changing the Toner Cartridge” on page 484.
Black formation
method does not
match application.
Open the printer driver and set black formation
to CMYK.
See “Printing Black” on page 31.