Sega 999-0921 - Manual (Page 59)

16. GAME BOARD
In order to prevent an electrical shock, be sure to turn power off
before performing work.
Be careful so as not to damage wirings. Damaged wiring can cause an
electric shock or short circuit accident.
In this product, setting changes are made during the test mode. The Game
BD need not be operated. Use the Game BD, etc. with the same settings
made at the time of shipment. Do not expose the Game BD, etc.
without good reason .
16 -1 LOCATING THE GAME BOARD
1
2
3
Turn power off.
Take out a total of 6 Truss Screws and
unlock to remove the Seat.
The GAME BOARD is located at the
position shown in the photo below.
Use two or more persons
when performing work.