Epson WorkForce Pro WF-C879RBAM User Manual page 330

Using Optional Items
2. Disconnect any connected cables.
Note:
If other paper cassette units have been installed, uninstall them as well.
3. Remove the output tray.
4. Remove the paper cassette unit from its box, and then remove any protective materials.
5. Check the items supplied.
6. Place the paper cassette unit where you want to set up the printer.
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Paper Cassette Unit Installing the Paper Cassette Units
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