HP Color LaserJet CP6015 Printer series - Manual (Page 176)

Install an HP Jetdirect or EIO print server card or EIO hard disk
This product is equipped with two external I/O (EIO) slots. You can install an additional HP Jetdirect
print server card or a hard disk in the available slots.
1. Turn the product off.
2. Disconnect all power and interface cables.
162 Chapter 11 Manage and maintain the product ENWW