Epson Pro 5000 Reference Manual page 180

Colors are not very vibrant.
Cause
The image was printed on the
wrong side of EPSON Ink Jet
Paper.
The Media Type setting does
not match the paper loaded.
Color dots are missing in printed graphics or characters.
The printed color image has gaps or faint areas.
Cause
The color print head nozzles
are clogged.
Black dots are missing in printed graphics or characters.
The printed black image is light or faint.
Cause
The black print head nozzles
are clogged.
8-26
Troubleshooting
What to do
Make sure that you are printing on the
coated side of the paper. If necessary,
flip over the paper and try printing
again. If printing has not improved,
clean the print heads as described on
page 8-37.
Make sure the Media Type setting in
your printer driver and the media type
lever position on the paper tray match
the type of media you have loaded, or
load media that matches the Media
Type setting.
What to do
Clean the print head. See "Cleaning
the Print Head" on page 8-37.
What to do
Clean the print head. See "Cleaning
the Print Head" on page 8-37.