Epson Stylus Color 660 Manual page 87

If the B black or A color ink out light is flashing or is on, replace
the empty ink cartridge as described in "Replacing an Empty Ink
Cartridge".
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Caution:
1. Make sure the printer is on. The P power light should be on,
but not flashing.
2. Lower the output tray; then open the printer cover.
3. Hold down the
print head moves to the replacement position. The P power
light begins flashing.
4. Lift the appropriate ink cartridge clamp. Then lift the ink
cartridge out of the printer and dispose of it properly.
5. Remove the yellow tape seal from the new cartridge.
6. Place the cartridge gently into the cartridge holder. Do not
press down on the cartridge. Then press the ink cartridge
clamp down until it locks in place.
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Replacing Ink Cartridges
Once you remove an ink cartridge, it becomes unusable and
cannot be reinstalled even if ink remains.
Leave the old cartridge installed in the printer until you are
ready to replace it with a new one.
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load/eject button for three seconds; the