"Epson Stylus C84
Q:
Is there a printer self test to determine if a problem is caused by the printer?
A:
Yes, you can run a printer check to determine whether a problem comes from the printer itself or some other source."
http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?BV_UseBVCookie=yes&infoType=FAQ&oid=23953&prodoid=36033903&foid=34546
"Running a Printer Check
You can run a printer check to determine whether a problem comes from the printer or some other source.
1. Turn off your printer and computer.
2. Disconnect the printer's interface cable.
3. Load letter-size paper in the printer.
4. Hold down the paper button, then press and release the power button. Continue holding down the paper button until the power light starts to flash, then release it.
A test page prints showing the printer's ROM version number, an ink counter code, and a nozzle check pattern. (If the pattern has gaps, you need to clean the print head as described in Cleaning the Print Head.)
* If the test page prints, the problem probably lies in your software settings, interface cable, or computer, or your software may not be installed correctly.
* If the test page doesn't print, you may have a problem with your printer.
Try the suggestions in Setup and Software Installation Problems. If nothing works, contact your dealer or EPSON as described in Where To Get Help.
5. Turn off the printer, reconnect the interface cable, then turn on your printer and computer.
"