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 WorkForce 500 Series control panel or your software.
From the Control Panel
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Press the Setup button.
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Select Maintenance and press OK.
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Select Nozzle Check and press OK.
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Press  Start.
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If there are gaps or the pattern is faint, clean the print head.
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Press OK when you’re done.
From the 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 the EPSON Printer Utility3, select WF 500 Series, 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.