Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 78)

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4. Select the optional cassette unit you installed as the Lower Cassette setting.
5. Click OK .
The optional paper cassette is now enabled.
Parent topic: Installing the Optional Paper Cassette Unit
Related tasks
Enabling the Optional Paper Cassettes - PostScript Printer Software - Mac
Loading Paper in the Cassette
You can load paper up to this size in the paper cassette: Legal (8.5 × 14 inches [216 × 356 mm])
Note: If the optional paper cassette unit is installed, do not remove more than one cassette at a time.
1. Make sure the product is not operating and pull out the paper cassette.