Basic HTML Version
CONNECTOR IDENTIFICATION
WILLIAMS ELECTRONICS GAMES uses a special technique to identify connectors.
Each plug or jack
receives a prefix number (which identifies the related circuit board or location within the game), a letter,
and a number. J-designa1ions 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 Board [ack): 3P6 designates
plug
6
of board
3 (
a Power 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.
BIG GUNS
CIRCUIT BOARDS
Major
BIG GUNS
Circuit Boards are in the backbox. They are accessible by removing the backbox glass,
unlatching the insert board, and swinging it open.
CPU BOARD. The System-11A CPU Board must be equipped with the ROMs specified in
the
BIG GUNS
(System-11A) ROM Summary. For this ROM complement and CPU Board
(pin 0-11392-557),
jumpers
wi,
W2, W4, W5, W7, W8,
wrr,
W12, W13, Wi4, Wi6, W17,
and W1
B
must be connected. (Jumper
W7
is cut/removed for West German games.)
AUDIO BOARD.
The Audio Board is
pin
0-11581-557,
as supplied with ROMs and
microprocessor.
DISPLAY BOARD. The Alphanumeric Display Unit Board
(pIn
0-11609) is on the Speakerl
Display Assembly, D-1161 0, which is
a
part
of
the Speaker/Display Panel, 0-11611.
POWER SUPPLY BOARD. The Power Supply Board is pin 0-8345-557.
Prefix: numbers for
BIG GUNS
System-11A circuit boards and major assemblies are listed
below. A prefix number may precede a component designator to identify the unit (e.g.,
connector lJ1).
1
-
CPU
6 -
Backbox
11
-
Audio
2
-
(not assigned)
7 -
Cabinet
12
-
(not assigned)
3
-
Baekbox Power Supply
8 -
Playfield
13
-
(not assigned)
4
-
Alphanumeric Display Unit
9 -
Insert Board
14
-
(not assigned)
5
-
AUl( Power Driver Board
10 -
(not assigned)
15
-
(not assigned)
BIG GUNS
GAME CONTROL LOCATIONS
The On-Off switch is on the bottom of the cabinet near the right front leg.
The Yolume Control is on the left inner wall of the cabinet on the tilt mechanism board. It is accessi-
ble by opening the coin box door.
The Credit switch is a pushbutton to the left of the coin door on the cabinet exterior.
GAME ADJUSTMENT/DIAGNOSTIC SWITCHES.
BIG GUNS
allows the operator to program virtually
all game adjustments, obtain bookkeeping information, and diagnose problems, using only three
switches mounted on the inside of the coin door and the Credit button beside the coin door.
ADVANCE, AUTO·UP/MANUAL-DOWN.
and HIGH-SCORE RESET are the switches
located
on
the
inside of the coin door.
Refer
to the
Game Status
Displays text and the Text/Diagnostic
Procedures for details concerning their operation.
The Memory Protect switch is on the inside frame of the coin door. This interlock switch must be open
to clear bookkeeping totals and to make game adjustments.
It automatically opens, when the coin
door opens.
BIG GUNS
2