Panasonic AV-HS04M6 Mode D'emploi page 12

Mounting
Align the board with the guide rails, and insert it slowly.
Insert it all the way in. Take care not to use force to insert the board because the
connectors may be damaged in the process.
Attach the board using the two screws.
After connecting the necessary cables, plug in the power cord, and turn on the power.
Checking that the board has been mounted correctly
Turn on the power of the AV-HS400AN/AE (or AV-HS400N/E), and use the menu used
to display the statuses of the option boards to check that the board has been mounted
correctly.
Press the [FUNC] button to light its indicator, and press the [SYSTEM] button to
display the SYSTEM menu.
Turn [F1] to display the OptVer sub menu.
<Menu display>
OptVer Select
16/16 IN-SL1
Turn [F2] to select the option slot (IN-SL1 or IN-SL2) using the Select item.
If the board has been mounted correctly, "Cmpsit" will appear at the Board item.
If it has not been mounted correctly, "None" will appear at the Board item.
Board Version
@@@@
Cmpsit
11 (E)
Screw
Screw