Epson Stylus CX6600 Quick Manual page 32

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After the nozzle check finishes printing, make sure each line is complete,
without any gaps or missing dots:
If any dots are missing, as shown below, clean the print head as described in
the next section.
Running the Head Cleaning Utility
If you need to clean the print head, follow these steps:
1. Press the Setup button to enter Setup Mode.
2. Press the green button next to the LCD screen until you see Head
Cleaning
displayed, then press the _> Color button.
The CX6600 runs a head cleaning cycle, and you see the message
"Head cleaning..." on the LCD screen.
Caution:
Never turn off the CX6600 while head cleaning is in progress, or you may damage
the CX6600.
.
When the message "Head cleaning..." disappears, repeat the nozzle check
(see page 31) to verify that the print head is clean.
If you don't see any improvement after cleaning three or four times, turn off"
the CX6600 and wait overnight. This lets any dried ink soften. Then try
cleaning the print head again the next day.
32 Maintaining Your CX6600