HP Color LaserJet CP3520 Printer Series - Manual (Page 165)

NOTE: This example shows installing an HP Jetdirect print server card.
1. Turn the product off.
2. Disconnect all power and interface cables.
3. Loosen and remove the two retaining screws holding the cover for the EIO slot, and then remove
the cover. You will not need these screws and the cover again. They can be discarded.
ENWW Replace supplies 153