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Please turn off the printer and unplug all its cables. Press and hold the power button for a minute. Wait for two minutes and plugin the cables.
Restart the printer and check if the issue persists.
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S H E F I N
That mean the gauges that get the paper tight. After loading the paper, make sure that it adjusted using the gauges to get it tight and straight.
Make sure that you have given the correct measurements while printing. It seems that you have selected printing on Envelops.
I apologize that I cannot contact you by phone right now. Are you able to copy like Xerox without any issues?
Do the following:
Note: If you print from Cassette 1 > Cassette 2 a window will appear. Click OK.
Also, check if you are loading the paper properly.
Also, check for paper jams inside the printer.
Paper jams : https://files.support.epson.com/docid/cpd4/cpd42849/source/troubleshooting/reference/xp800/problem_jam_inside_xp800.html
Link 2 : https://files.support.epson.com/docid/cpd4/cpd42849/source/troubleshooting/reference/xp800/problem_jam_cassette_xp800.html
Link 3 : https://files.support.epson.com/docid/cpd4/cpd42849/source/troubleshooting/reference/xp800/problem_jam_rear_cover_xp800.html