Epson WF-7840 Series User Manual page 249

Solving Problems
The print head nozzles may be clogged.
Solutions
Use the Print Quality Adjustment feature. If you have not used the printer for a long time, the print head
nozzles may be clogged and ink drops may not be discharged.
"Adjusting the Print Quality" on page 150
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Printout Comes Out as a Blank Sheet
The print head nozzles may be clogged.
Solutions
Use the Print Quality Adjustment feature. If you have not used the printer for a long time, the print head
nozzles may be clogged and ink drops may not be discharged.
"Adjusting the Print Quality" on page 150
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The print settings and the paper size loaded in the printer are different.
Solutions
Change the print settings according to the paper size loaded in the paper cassette. Load paper in the
paper cassette that matches the print settings.
Multiple sheets of paper are fed into the printer at the same time.
Solutions
See the following to prevent multiple sheets of paper being fed into the printer at the same time.
"Several Sheets of Paper are Fed at a Time" on page 171
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Paper Is Smeared or Scuffed
The following causes can be considered.
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Printing, Copying, Scanning, and Faxing Quality is Poor
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Copy Quality is Poor