Epson colour 640 Printer Basics Manual page 45

If your printout is faint or
has gaps in the image . . .
Clean the print head
(see page 20).
Make sure your paper isn't
damaged, old, dirty, or
loaded face down (the
printable surface should be
loaded face up). If it is,
reload a new stack of paper
with the printable (whiter)
side up.
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If your printout contains
incorrect colors or some of
the colors are missing . . .
Make sure the Ink setting is
set to Color for color images.
Clean the print head
(see page 20).
Make sure the ink cartridges
aren't low on ink. If an ink
out light is flashing, replace
the ink cartridge (see
page 24). If your ink
cartridge is more than six
months old, you may need to
replace it (see page 28).
Use the Automatic mode
setting or choose a different
custom project type.
Remember that because your
monitor and printer use
different technologies to
represent colors, your
printed colors cannot
exactly match the colors you
see on your monitor screen.