Panasonic UF-8300 Service Manual page 209

(6) Install the Hardware Key into the connector (CN517)
on the SC PC Board.
Caution:
The connector is keyed, to prevent damage to the SC
PC Board, install the Hardware Key as illustrated. Do
not force the Hardware Key into the connector if facing
the wrong way.
(7) Proceed with the installation of other options. If
finished, reinstall all Harnesses and Covers.
(8) Reinstall the SD Memory Card if it was removed.
(9) Plug the AC Power Cord first, then reconnect the
Telephone Line Cable.
(10) Reconnect the LAN / USB Cable(s) if disconnected.
(11) Install the Internet Fax Software into the PC by
following the prompts of the installation Wizard.
For details, refer to the Operating Instructions
209
UF-8300/8200
UF-7300/7200