HP LaserJet 3055 - Manual (Page 309)

5. Return the assembly to the same place in the ADF. The largest roller goes in back, and the gear
side is away from you.
6. Lower the green lever with the flat green part fitting in between the rollers. Press down on the
green lever until you hear a snap.
7. To check for proper installation, lift the green lever until it remains open. The pickup roller
assembly should be secured to the lever assembly and should not fall out.
8. Make sure that both sides of the assembly are secured by the green hooks.
ENWW Cleaning the all-in-one 291