Oki B820n User Manual page 18

Chapter 1 Printing with various kinds of paper
Select [Multi Purpose Tray] from [Source] in the [Setup] tab.
⑤
1
Click [OK].
⑥
Click [OK] or [Print] on the Print screen, in order to print.
⑦
For those using a Mac OS X
Select [Page Settings] from the [File] menu.
①
Select the printer model name in [Format For]; [A4] or [Envelope]
②
in [Paper Size], and the appropriate orientation in [Orientation],
and click [OK].
Select [Print] from the [File] menu.
③
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Select [Multi-Purpose Tray] on the [Paper Feed] panel.
④
If you are using a PS driver, select [Medium-Heavy] in [Media
⑤
Type] within [Insert Option] function settings on the [Printer
Features] panel.
If you are using a PCL printer driver, select [Multipurpose Tray]
on the [Setup] panel, select [Heavy] in [Media Weight] on the
[Setup] panel.