Sega INITIAL "D" TYPE TWIN. - Manual (Page 97)

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FIG. 19. 2
19-2 REMOVING THE GAME BOARD
 Follow the above described action to open cabinet
 Remove all the connectors from the filter board on the Game Board. Also remove the GD cable
connector from the DIMM board.
 Remove the 4 screws that fix the Game Board.
SCREW (4)
M4×16,w/flat & spring washers
Disconnect all connectors.
D-SUB connector
GD cable connector