Sony DSBK-2020 Installationsanleitung Seite 28

TX-96A board
CN201 and CN202 connectors
5
If the other option board is inserted in the board slot (fourth from
the outside), remove it and insert the HIF-34 board. Slide down the
guides at each side, pressing firmly until the connector plugs into
place.
HIF-34 board
28 Installation