Epson CX6500 Reference Manual page 239

Note:
If the copy quality has not improved after repeating this procedure four or five times, turn
the CX6500 off and let it sit overnight. Then, perform the nozzle check again and repeat
the head cleaning if necessary.
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.
For Mac OS X
Follow the steps below to clean the print head using the Head Cleaning utility.
Make sure that Letter-size paper is loaded in the sheet
feeder.
Make sure that the CX6500 is on and the ! Error light is
off.
Access the Epson Printer Utility dialog
box.
Accessing the Printer Software for Mac OS
X
Click the Head Cleaning button in the Utility dialog
box.
Follow the on-screen
instructions.
Cartridge. If the copy quality remains a problem after replacing the ink