In The Manual Feed - Lexmark E320/E322 User Reference Manual

In the manual feed

Use the manual feed to print one label sheet at a time. If you experience problems feeding labels in
tray 1, try printing one sheet at a time from the manual feed.
1
Extend the front paper support on the paper output bin until you hear a click.
2
Open the front output door for a straight-through paper path.
3
Load the label sheet with the side you want to print on facing you.
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