HP C5370A - Manual (Page 14)

2-4 Setting Up Your New HP Color Copier
Step 3 — Unlock Your HP Color Copier
The scanner lock is under the front panel.
Unlock the scanner by twisting the green knob under the front panel
toward the back of your HP Color Copier, until it stops. The knob only
turns one way.
NOTE Leave the scanner unlocked unless you need to move your HP Color Copier.
Locking the scanner protects it during moving. Refer to “Prepare your HP
Color Copier for Shipment” on page 8-5 for locking instructions.