HP 3500 - Manual (Page 238)

Installing an hp Jetdirect print server card in the hp color LaserJet
3700 series printer
You can install an HP Jetdirect print server card in the base model printer, which comes with
an open EIO slot.
To install an HP Jetdirect print server card
1. Turn the printer off.
2. Disconnect all power and interface cables.
226 Appendix E Working with memory and print server cards ENWW