HP CM3530 - Manual (Page 205)

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.
4. Firmly insert the HP Jetdirect print server card into the EIO slot.
5. Insert and tighten the retaining screws that came with the print server card.
ENWW Replace supplies 191