HP LaserJet Enterprise M4555 MFP series - Manual (Page 298)

Clear staple jams (for models with a stapler/stacker)
1. Press the release latch, and then slide the
stapler/stacker away from the product.
2. Open the staple-cartridge door.
3. Lift up on the staple-cartridge green handle,
and then pull the cartridge out of the stapler to
remove it.
278 Chapter 13 Solve problems ENWW