Epson Stylus COLOR 640 Setup And Daily Use page 29

8. Press the ink cartridge clamp down until it locks in place.
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9. Press the R cleaning button. The printer moves the print head
and begins charging the ink delivery system. This process
take about 1 minute to complete. When the ink charging
process is finished, the printer returns the print head to its
home position and the P power light stops flashing.
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10. Close the printer cover.
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Caution:
Once you install the cartridges, do not open their clamps
again until you replace the ink cartridges. Otherwise, the
cartridges may become unusable.
Caution:
The P power light continues to flash while the printer
performs the ink charging operation. Never turn off the
printer while this light is flashing. Doing so can result in
incomplete charging of ink.
The illustration shows color
ink replacement. To replace
black ink, press down the
smaller clamp on the left.