HP LaserJet M3027 Multifunction Printer series - Manual (Page 89)

Load staples
Each staple cartridge holds 1,500 unformed staples. To load staples into the device, insert a staple
cartridge.
1. Open the stapler door.
NOTE: Opening the stapler door disables the stapler.
2. If you are replacing a staple cartridge (for example, if your staple cartridge has run out of staples),
remove the staple cartridge from the device.
ENWW Use the convenience stapler 77