Usually only one side of transparencies can be used for printing. Be sure to load them with the print side up.
Load the paper face up in the multi bypass tray (Tray A).
Press [Tray A].
Make sure that [Paper Size] is selected.
Specify the paper size, and then press [OK].
Press [Special Paper].
Press [Transparency], and then press [OK].
Place the originals, and then press the [Start] key.
When copying onto transparencies, remove copied sheets one by one.
For details about the sizes of transparencies that can be used, see "Recommended Paper Sizes and Types", Paper Specifications and Adding Paper.
You can also load transparencies into the wide LCT and make copies on it. Be sure to specify the paper type under [Tray Paper Settings]. For details, see "Changing Tray Paper Settings", Paper Settings.