Basic HTML Version
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CPU BOARD
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+5V
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INTERFACE
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BJO,ARD J3
1
J205
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74LS240
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470pf
Dedicated Input
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DEDICATED SWITCHES
r--------------_ ..--------- ..--------------.,
1
Coin Door Interface Boord
1 ~~r:Fc::i\~~e~r
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J1
J3 [
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Orange-Brown
(U17-5)
01
:
14
4
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2
Orange-Red
(U17-7)
02
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5
,
Orange-Black
(U17-11)
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3
OJ
12
6
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(U17-9)
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4
Orcnge-Y«rllow
04
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17
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6
: Orange-Green
(U16-9)
05
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11
7
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OranQe-Blu"
(U1S-11) 06
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7
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10
8
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1
Orange-Violet
(U16-7)
07
,
B
9
9
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1-VV
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l Orange-Groy
(U16-S)
DB
9
S
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: Block
15
3
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DEDICATED SWITCH CIRCUIT
Siock
Switch
L Off
H On
S
C
A
H
L
H
L
pen
Closed
Coin Acceptor Switches
01 Left Coin Chu te
02 Cent.r Coin Chute
OJ Right Coin Chute
04 FQurth Coin Chute
ContrA! Swjtches
05 Normal Functlcn: Service Credits
Test FUr'lction: Escape
06 Normol
Function: Volume Down
Test function: Down
07 Normal Function: Volume Up
Test Function: Up
08 N(Jr'mol Function: Begin Test
TlSt Function;
Enter
Coin Acceptor
or
Control
Switches
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 about +5V, its output is high and the row is inactive.
3-3