HP Color LaserJet 4730 Multifunction Printer series - Manual (Page 307)

6. Remove the staples that protrude from the staple cartridge.
7. Close the lever at the back of the staple cartridge. Be sure that it snaps into place.
8. Reinsert the staple cartridge into the staple-cartridge holder, and push down on the green handle
until it snaps into place.
9. Close the staple-cartridge cover, and slide the stapler/stacker into the MFP.
Jam in the 3-bin mailbox
1. Push the release button on the top of the 3-bin mailbox.
ENWW Clearing jams 287