Epson CX6500 Reference Manual page 366

In the Document Name list, select the document which is printing, then click the
icon button to cancel the print job.
When background printing is off
Follow the steps below to cancel a print job.
Press the Stop button to stop
printing.
Hold down the
print job.
For Mac OS X
Follow the steps below to cancel a print job.
Click the Print Center or Printer Setup Utility icon in the
Dock.
command key on your keyboard and press the period (.) key to cancel the
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Delete