Oce CS520 User Manual page 101

Making Double-Sided Copies (1)2, 2)2)
STOP
Press [ ] to suspend the printing job. See p. 3-81 for details.
When the finisher / trimmer unit / paper exit tray capacity is
exceeded due to the print quantity selected, remove the copied sets
as they exit; otherwise, mishandled paper will occur.
3-101