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1----1 31-4-------'
DEDICATED SWITCHES
.------,
, CPU Board
1
1
J205
1
1 -
-C~i~ Ooc;r int~rfa~e
B~.:d- -;
Coin Acceptor
1
,
or
1
Jl
J3
,Control Switches
'1
1
Or~e-Brown (U17-5) Dl
1
r-
'4
-'--0'
1
4
,
1
1
,
1
Orange-Red (U17-7) D2
1
3
5
,
2
,
1
1
,
1
Orange-Black (U17-11) D3
1
,
3
2
6 --+-<>"
1
1
,
1
1
,
4
1
Orange-Yellow (U17-9) D4
1
,
7
1
1
,
1
1
,
1
Orange-Green (U16-9) D5
1
7 ~--o'
6
1
1
1
,
1
Orange-Blue (Ul6-11) D6
1
0
8 '
_,
7
r--r---o
1
1
,
1
Orange-Violet (U16-7) D7
1
,
8
1
9
9~
<,
1
1
,
1
1
,
9
1
Orange-Gray (16-5)
08
1
8
l,_'--o
1
1
,
1
,
,
1
Black
1
~5
3
,
_c-c2
,
'-
'-
~
- -
- - -
- - -
- -
- - - - -
.
DEDICATED SWITCH CIRCUIT
r - - - - - - - - - - - - - - - - - - - - - - - - - - - -
I
, CPU Board
Coin Door
Interface
Board
1.2K
,
J205 ,
,
J1
A 1N4148
X ' Orange-XXX, X
1K
Dedicated Il1lut
1470 P
f
, Black
15
Switch
H
L
A
B C
Off
On
Open
Closed
H
L
Coin Acceptor Switche8
Dl
Left Coin Chute
D2 Center Coin Chute
D3 Right Coin Chute
D4 Forth Coin Chute
Control Switche8
D5 Normal Function: Service Credits
Test Function: Escape
D6 Normal Function: Volume Down
Test Function: Down
D7 Normal Function: Volume Up
Test Function: Up
DB
Normal Function: Begin Test
Test Function: Enter
I
I
I
Coin Acceptor
J3
I
or
1
Control Switch
1--_--1X~
The dedicated switches operate similar to switches in the matrix except that instead of a column circuit there is a direct tie to
ground. Therefore, the column side is constantly active (low).
When a switch closes the row side (dedicated input) of the circuit activates. The "+" input to the LM339 drops below +5V
causing its output to go low. Since the row circuit (dedicated input) is tied directly to ground through the switch, the switch is
considered closed by the microprocessor. When the switch opens, the "+" input to the LM339 is above +5V, its output is high
and the row is inactive.
3-3