Epson CX6500 Reference Manual page 241

If the copy quality still has not improved, one or both of your ink cartridges may be old or
damaged and may need to be replaced. To replace an ink cartridge before it is empty, see
Replacing an Ink
cartridges, contact your dealer.
To maintain good copy quality, we recommend printing a few pages at least once every
month.
Using the control panel buttons
Follow the steps below to clean the print head using the control panel buttons.
Make sure the CX6500 is on, and the ! Error light is
off.
Press the Setup Mode button to enter the Setup
Mode.
Press the A or
then press the
the LCD panel.
Caution:
Never turn off the CX6500 while Head cleaning... appears on the LCD panel. Doing so
may damage it.
When Head cleaning... disappears from the LCD panel, perform the nozzle check to confirm that
the head is clean and to reset the cleaning cycle. See
Note:
Cartridge. If the copy quality remains a problem after replacing the ink
/ Select button repeatedly until 4.Head Cleaning appears on the LCD panel,
Color button. Cleaning of the print head starts and Head cleaning... appears on
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Checking the Print Head Nozzles.