HP CM3530 - Manual (Page 204)

Install an HP Jetdirect or EIO print server card or EIO hard disk
This product is equipped with an external I/O (EIO) slot. You can install an additional HP Jetdirect print
server card or external EIO hard drive in the available EIO slot.
NOTE: This example shows installing an HP Jetdirect print server card.
1. Turn the product off.
2. Disconnect all power and interface cables.
190 Chapter 13 Manage and maintain the product ENWW