Sony DSBK-190 Manuel D'installation page 16

Installation
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Pass the harness through the cable holder on the IF-763
board, and connect to connector CN401.
Connector CN401
IF-763 board
Insert the IF-763 board in the board slot (fourth from the
outside).
Align the three connectors on the bottom of the board with
the three connectors inside the unit, and push the board
firmly into place.
IF-763 board
Cable holder