HP LaserJet 4250 - Manual (Page 129)

5. Disconnect cable that connects the stapler unit to the stapler/stacker. (Only the blue part
detaches.) Release the white tab that contains the blue cable connector by opening the
tab to the left.
6. Remove the new stapler unit from its packaging.
7. Connect the cable on the new stapler unit to the stapler/stacker.
8. Place the peg that is located on the bottom of the new stapler unit into the hole in the
stapler/stacker.
ENWW Replacing the stapler unit 117