Sharp AM-900 - Manual (Page 13)

Installation
11
1. Installation
Installation
Attaching the trays
Attach the document feeder tray.
Slide the output tray into the machine as shown. When it stops, lift the end
slightly and push in so that the tray locks in place.
Important:
The output tray must be attached correctly or the machine will not operate.
If you will be
using legal paper,
pull out the tray
extension