Sega INITIAL "D" TYPE TWIN. User 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