Follow the procedure below to set the machine using the control panel when loading custom size paper onto the bypass tray.
If you select [Machine Setting(s)] in [Bypass Tray] under [Tray Setting Priority] in [System] of [Printer Features], the settings made using the control panel have priority over the printer driver settings. For details about [System] settings, see "System".
Press the [User Tools/Counter] key on the control panel.
Press [System Settings].
Press the [Tray Paper Settings] tab.
Press [Printer Bypass Paper Size].
Press [Custom Size].
If a custom size is already set, press [Change Size].
Press [Vertical], enter the vertical size of the paper using the number keys, and then press the  key.
Press [Horizontal], enter the horizontal size of the paper using the number keys, and then press the  key.
The paper sizes entered are displayed.
Press the [User Tools/Counter] key.
The initial screen appears.
When loading thick paper, thin paper or OHP transparencies, set paper size and paper type.
[A4] is the default setting for [Printer Bypass Paper Size].
For details about setting printer drivers, see the printer driver Help.