Epson Pro 5000 Reference Manual page 29

1
2. Set the paper size lever to Envelope and set the media type
lever to match the type of envelope you load in the paper
tray. If the envelope is a normal one, select Plain Paper. Set
the lever to Other if you are unsure of the type of envelope
you load.
Note:
Do not load envelopes in the optional lower paper tray or in the
front manual feed slot.
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Printing on Various Kinds of Paper