Gomez's Design Details
(Continued)Gomez's Design Details
(Continued)
The Back Box Lock
A lock, just below the header on the back box, secures the back glass and back box from intruders. Most operators keep the key for the back box lock on a wire hanging from the coin door, just inside the coin door.
The Insert Board
Directly above the dot matrix display, and behind the back glass cover art, is the insert board. This board is used primarily to mount the lights and flashers that illuminate the backglass. It also serves to protect the circuit boards housed behind it. It is painted white to better reflect the light given off by the bulbs. Bulbs mounted to this board may be easily changed without opening the insert board door.
The insert board is mounted on hinges on the left side and a latch on the right side, so it opens like a door. Lamp and flasher sockets and their wires are mounted with staples on the back side of this board.
Dot Matrix Display
The back box also houses the dot matrix display and speakers. The dot matrix display is mounted between two speakers behind a special display board. Wire harness connect to the dot matrix display from the video board mounted directly above it and behind it. The entire board slides in between the walls of the back box, and attach with two metal hooks to two small wooden blocks, mounted on the inside walls of the back box.
The display is nothing more than many rows and columns of little light emitting diodes (LEDs) strung together. Software in the EPROM chips tell the display what to display when the game is being played, or when the machine is being tested using the onboard controls inside of the coin door. It also displays attract mode messages, when the machine is powered on but is not being played.
The Speakers
There are two speakers mounted on the back box: One on the left and one on the right side of the dot matrix display. The one on the left is a bigger, 25W speaker.
The one on the right is a smaller 10watt speaker.
They are both wired to the sound board directly above them. These speakers are used for most of the music played from the sound board. There is a third, larger twelve inch speaker mounted to the bottom of the playfield cabinet that is used to give more depth to the bass sounds produced from the sound software during game play. All speakers have black, metal grilles over them to protect them from being punctured. Volume is controlled by the controls inside the coin door.
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