Adjust Print Quality : Clean the Print Head

Check the Print Head Nozzles
You can print a nozzle check pattern to check for clogged nozzles using the printer’s buttons or your software. Make sure the front tray is in the lower (paper) position.
Using the Printer’s Buttons
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Hold down the paper button as you press the  power button to turn the printer back on. Hold down both buttons until the printer turns on, then release the buttons.
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If there are gaps or the pattern is faint, clean the print head.
Using Your Computer
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Windows:
Right-click the  printer icon in the bottom right corner of your screen (the taskbar) and select Nozzle Check.
Macintosh:
Open the Applications folder, open EPSON Printer Utility3, select your printer (if necessary), and click OK. Then select Nozzle Check.
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Click Print.
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If there are gaps or the pattern is faint, clean the print head.