Epson WF-C878R Series User Manual page 188

Maintaining the Printer
5. Pull out rear cover 2.
6. Remove the cover inside the back of the printer.
7. Slide out the two used maintenance rollers, and remove them.
8. Insert two new maintenance rollers until they click into place.
Note:
Insert the maintenance rollers by rolling them so that you can insert them smoothly.
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Replacing Maintenance Rollers in Paper Cassette 1
188