Epson 4500 - Manual (Page 209)

Printing
Problem
The print is faint or
uneven (continued).
The printout is faint.
Solution
The ribbon may be worn out. A worn
ribbon can damage the print head and
should be replaced. Install a new ribbon
cartridge. See Chapter 6.
Dots are missing in the
printed characters or
graphics.
A line of dots is
missing in the
printout.
Dots are missing in
random positions.
The paper thickness lever may not be set
correctly for the paper you are using. Set
the paper thickness lever to match the
thickness of your paper. See Chapter 2.
The print head is damaged. Stop printing
and call the Epson toll-free number
(1-800-922-8911) for information on where
to have the printer repaired.
There is either too much slack in the ribbon
or the ribbon has come loose and gotten
caught on something. Stop printing, turn
off the printer, and reinstall the ribbon
cartridge. See Chapter 6.
Troubleshooting 7-7