Apple Macintosh Performa 577 - Manual (Page 75)

Take Apart Chassis Harness Assembly - 40
Logic Board Connector and Cable Assembly
First remove the EMI shields, speaker assembly, and front
panel control board.
Overview of removal procedures
(Detailed steps follow the
overview.)
First disconnect all the connections from the top of the
chassis. Then route the cables through to the underside of the
chassis and disconnect the logic board connector.