Large Capacity Stacker LS-506 has a stacker tray (with the carriage) and a secondary (sub) tray.
For details, refer to each of the following pages.
Outputting to the Stacker Tray
Removing Finished Sets from the Stacker Tray
To Prevent Paper in the Stacker Tray from Collapsing
Outputting to the Secondary (Sub) Tray
Allowing Paper from Several Jobs to Pile Up
Switching Stacker Automatically