Epson Stylus Color 660 Manual page 95

Note:
Print head cleaning uses both color and black ink. To avoid wasting
ink, clean the print head only if print quality declines; for example,
if the printout is blurry or the color is incorrect or missing.
Use the Nozzle Check utility to confirm that the print head needs to
be cleaned. This saves ink.
When the B black or A color ink out light is flashing or on, you
cannot clean the print head. Replace the appropriate ink cartridge
first.
Do not start the Head Cleaning or Nozzle Check utility while
printing is in progress; otherwise your printout may be marred.
Using the Head Cleaning utility
For Windows users
1. Make sure that both B black and A color ink out lights are off.
Note:
If the B black or A color ink out light is flashing, you can not clean
the print head. Replace the appropriate ink cartridge first.
2. Access the printer software window. If you need instructions,
see "Accessing the printer software".
3. Click the Utility tab, then click the Head Cleaning button.
4. Follow the messages on your screen.
The P power light flashes while the printer performs the
cleaning cycle. It takes about one minute to complete.
c
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Maintenance
Caution:
Never turn off the printer while the P power light is flashing.
Doing so may damage the printer.