HP Color LaserJet CM6030CM6040 Multifunction Printer series - Manual (Page 221)

Install an HP Jetdirect or EIO print server card or EIO hard disk
The HP Color LaserJet CM6030 and CM6040 MFP Series are equipped with an embedded print server
port. If desired, you can install an additional I/O card in the available EIO slot.
1. Turn the product off.
2. Disconnect all power and interface cables.
ENWW Replace supplies 205