Basic HTML Version
,
, Coin Acceptor
J3,
or
, Control Switch
Xt---I X '
, Black
h-"=';::'::":;__---.-l15
t---I
3
1-4---------'
DEDICATED SWITCHES
-------,
, CPU Board '
,
J20S ,
: - -C~i~ ~r ~nt~rfa~e
B~rd- -:
CoinA::epror
, J1
J3
,Control Switches
rr
' Orange-Brown (U17-5) 01
,
r-
-~,
,
,
4 ,
,
,
,
, Orange-Red (U17-7) D2
,
3
5
,
2
,
,
,
,
, Orange-Black (U17-11) OS
,
,
3
2
6--0 ....
,
,
,
: Orange-Yellow (U17-9)
,
,
4
D4
,
,
7
,
,
,
,
,
,
, Orange-Green (U16-9) OS
,
7 '
_..•.
6
,
1
-.--"
,
,
,
, Orange-Blue (U16-11) OS
I
0
8
I _•.•.
7
-.--0
,
,
,
, Orange-Violet (U16-7) 07
,
,
8
,
9
9
----ci'
,
,
,
,
,
,
9 ' Oranae-Grav (16-S) OB'
8
1 , _,
,
,
--;---0
,
,
,
,Black
I
5
3
,
__c-
_2
,
,'-
-
, -
-
- - - -
- - - -
- - - - -
.
PEDICATED SWITCH CIRCUIT
r - - - - - - - - - - - - - - - - - - - - - - - - - -
--I
, CPU Board
+5V
Coin Door
Interface
Board
+12V
Oedicaled Input
Switch
H
L
A
B
c
Off
On
H
L
Open
Closed
Coin Acceptor Switches
01 Left Coin Chute
02 Center Coin Chute
OS Right Coin Chute
D4 Forth Coin Chute
Control Switches
05 Normal Function: Service Credits
Test Function: Escape
OS Normal Function: Volume Down
Test Function: Down
07 Normal Function: Volume Up
Test Function: Up
08 Normal Function: Begin Test
Test Function: Enter
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.
Twilight Zone 3-3