Epson Stylus COLOR 640 Setup And Daily Use page 15

6. Press the ink cartridge clamps down until they lock in place.
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7. Press the
and begins charging the ink delivery system.
The ink charging process may take about one minute to
complete, during which time the P power light flashes and the
printer produces a variety of mechanical sounds. These sounds
are normal. When the ink delivery system has been charged, the
print head returns to its home (far right) position.
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Caution:
Once you install the ink cartridges, do not open their clamps
again until you replace the ink cartridges. Otherwise, the
cartridges may become unusable.
R
cleaning button. The printer moves the print head
Caution:
Never turn off the printer while the P power light is flashing.