Lexmark T630 User's Reference Manual page 139

7
If the edge of the print media is visible, pull the print media straight up and out.
If the print media is not visible, continue with
cover.
8
Remove any sheets of print media lying in the duplex front access cover.
9
Hold the duplex front access cover level while you slide it back into the duplex unit. Make sure
it snaps into place.
10
Slide the standard tray back into the printer.
23x Paper Jam
step 8. Otherwise, close the duplex front access
Interior view of duplex unit
139