Basic HTML Version
Dedicated Switches
, CPU BOARD'
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, COIN DOOR INTERFACE
,Coin Acceptor
: J1
BOARD
J3:
controt~wltches
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J205 ,
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.Oranoe-Brown (U17-5) 01 '
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,Orange-Red
(U17-7)
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.Orange-Black (U17-11) 03 '
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'Orange-Yellow (U17-9)
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.Oranqa-Green (U16-9)
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'Orange-Blue
(U16-11) 06 '
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'Orange-Violet
(U16-7)
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'Orange-Gray
(16-5)
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'Black
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15
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L ..__
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1
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Dedicated Switch Circuit
Coin Acceptor Switches
01 Left Coin Chute
02 Center Coin Chute
03 Right Coin Chute
04 Forth Coin Chute
Control
Switches
05 Normal Function: Service Credits
Test Function: Escape
06 Normal Function: Volume Oown
Test Function: Oown
07 Normal Function: Volume Up
Test Function: Up
08 Normal Function: Begin Test
Test Function: Enter
CPU BOARD
+5V
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INTERFACE
BOARD
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J205 ,
Dedicated Input
I~70Pf
, Black
1--+
-+-115
f----i 3I -:- -----___J
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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ J
I
J1
J3
Coin Acceptor
or
Control Switch
1
----
Switch
A
B
C
L Off
H On
H
L
Open
Closed
H
L
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 therefore its output is 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.
INDIANA JONES 3-3