HP PageWide MFP P77740-60 series - User Guide
5. Remove the sheet with the jammed staples.
6. Close the green metal lever until it snaps into place.
7. Insert the stapler cartridge into the printer until it snaps into place.
8. Close the stapler door, and carefully return the printer to its original position.
Cartridge issues
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Relled or remanufactured cartridges
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Interpret control panel messages for cartridges
ENWW Cartridge issues 141