HP Color LaserJet Enterprise M855 and Flow MFP M880 - Hole Punch Kit Installation Guide
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Slightly lift up on the cover to release it, and then remove
the cover.
Remove one screw from the punch rear cover assembly.
Slightly lift up on the cover to release it, and then remove
the cover.
Open the punch door.
Pull the punch waste box straight out of the punch assembly to
remove it.
Raise the punch upper cover, and then open the front door.