Epson WorkForce Pro WF-C878RB User Manual page 268

Solving Problems
The print head position is out of alignment.
Solutions
Align the print head using the Print Quality Adjustment feature.
"Adjusting the Print Quality" on page 168
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The bidirectional printing setting is enabled.
Solutions
If print quality does not improve even after aligning the print head, disable the bidirectional setting.
During bidirectional (or high speed) printing, the print head prints while moving in both directions, and
vertical lines may be misaligned. Disabling this setting may slow down printing speed but improve print
quality.
❏ Control panel
Select Settings > General Settings > Printer Settings, and then disable Bidirectional.
❏ Windows
Clear Bidirectional Printing on the printer driver's More Options tab.
❏ Mac OS
Select System Preferences from the Apple menu > Printers & Scanners (or Print & Scan, Print &
Fax), and then select the printer. Click Options & Supplies > Options (or Driver). Select Off as the
Bidirectional Printing setting.
Printouts are Blank or Only Some Lines are Printed
The print head nozzles may be clogged.
Solutions
Try Power Cleaning.
"Running Power Cleaning" on page 170
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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.
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Printing, Copying, Scanning, and Faxing Quality is Poor
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Print Quality is Poor