Epson LX 300+II Reference Manual page 82

The print is faint or uneven
Parts of printed characters are missing at the bottom.
Cause
The ribbon cartridge may
not be installed properly.
The printout is faint.
Cause
The ribbon may be worn
out.
Dots are missing in printed characters or graphics
A line of dots is missing in the printout.
Cause
The print head is
damaged.
Dots are missing in random positions.
Cause
Either there is too much
slack in the ribbon or the
ribbon has come loose.
82
Maintenance and Troubleshooting
What to do
See "Replacing the Ribbon Cartridge" on
page 105.
What to do
Replace the ribbon cartridge as
described on page 105.
What to do
Stop printing and contact Epson to have
the print head replaced. See "Where To
Get Help" on page 96.
What to do
Reinstall the ribbon cartridge as
described on page 105.