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CONNECTOR
&
COMPONENT IDENTIFICA liON
WILLIAMS ·ELECTRONICS GAMES uses a special technique to identify connectors and. Each plug
or jack receives a prefix number (which identifies the circuit board), a letter, and a number.
J-designations refer to the male part of a connector.
P-designations refer to the female part of a
connector. For example, 1J1 designates jack 1 of board 1 (a CPU Boardjack); 3P6 designates plug 6
of board 3 ( a Ppwer Supply Board plug). Identifying the specific pin number of a connector involves a
hyphen, which separates the pin number from the plug or jack designation. For example, 1J1-3 refers
to pin 3 of jack 1 on board 1.
Other game components may also have similar prefixes preceding their designator to clarify their
locations or related circuit.
Prefix numbers for the System 11B circuit boards and other major assemblies are listed below. A prefix
number may precede a component designator to identify its associated unit (e.g., connector lJ1).
1 - CPU
2 - Master Interconnect
3 - Backbox Power Supply
4 - Alphanumeric Display
5 - Aux Power Driver
6 - Backbox
7 - Cabinet
8 - Playfield
9 - Insert Board
10 - Audio
EARTHSHAKER
CIRCUIT BOARDS
System 11 B Circuit Boards for
EARTHSHAKER
are in the backbox.
They are accessible by
unlocking the Backbox lock, removing the Backbox glass, unlatching the Insert Board (with lamps and
the EARTHSHAKER Meter display), and swinging it open.
The Master Display Board is mounted on the back of the Speaker/Display Panel, just below the Insert
Board. To access the Master Display Board, carefully lift the Speaker/Display Panel out of its bottom
guide and lay it forward onto the top of the game cabinet.
Lamp circuit boards are mounted on the Playfield, the Insert Board, and on top of the Backbox under
the EARTHSHAKER Dome.
CPU BOARD. The System 11B CPU Board (p/n 0-11883-568) must be equipped with the
ROMs specified in the
EARTH SHAKER
(System 11B) ROM Summary. CPU Board jumpers
W1, W2, W4, W5
j
W7, W8, W11, W14, W16, W17, and W19 must be connected.
AUDIO BOARD. The Audio Board is pIn 0-11581-568, including ROMs and microprocessor.
DISPLAY BOARD. The Alphanumeric Display Unit Board is pIn 0-12232-1.
POWER SUPPLY BOARD. The Power Supply Board is pIn D~12246-568.
AUX POWER DRIVER BOARD. The Aux Power Driver Board is 0-12247-559.
MASTER INTERCONNECT BOARD. The Master Interconnect Board is 0-12313-568.
Figure 1 shows the locations of these circuit boards, as well as other devices especially located to
make
EARTHSHAKER
a great game.
EARTHSHAKER 2