HP 8550mfp Service Manual - Page 213

3,000-sheet stapler/stacker Device configuration The HP 3,000-sheet stapler/stacker and the HP 3,000-sheet stacker attach to printers' left sides. 3,000-sheet stapler/stacker Set the default offset action and default stapler action at the printer control panel under Configuration of Stkr. The options for default offset action are:
No Print jobs or mopies are stacked without separation (although stapling options override this setting).
Yes Print jobs or mopies are offset from each other. The options for default stapler action are:
No staple Print jobs or mopies are delivered to the stapler bin without being stapled.
One angled staple Print jobs or mopies are stapled with one staple at a 40° angle.
(#) staples Print jobs or mopies are stapled with the configured number (1, 2, 3, or 6) of staples.
Custom staples Print jobs or mopies are stapled with the configured number of staples as defined by the network administrator. 3,000-sheet stacker Set the default offset action at the printer control panel under Configuration of Stkr. The options for default offset action are:
No Print jobs or mopies are stacked without separation.
Yes Print jobs or mopies are offset from each other.
Job Separator Print jobs or mopies are separated by offsetting the first page. EN 3,000-sheet stapler/stacker 211