Basic HTML Version
DEDICATED SWITCHES
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Coin Door Interface Boord
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Coin Acceptor Switches
01 Left Coin Chute
02 Center Coin Chute
OJ
Rioht
Coin Chute
04 Fourth Coin Chute
Control
Switches
D5 Normol Function: Service Credit!
Teat Function: Eecope
06 Normal Function: Volume Down
Test Function: Down
07 Normal Function: Volume Up
Te!!;t Fvoctlcn: Up
08 Normal function: Begin Test
Tfu!:t Function:
Enter
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COIN DOOR :
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Coin Acceptor
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Control Switches
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3-3
.,
Orange-Brown
(Ull-5)
01
,
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,
4
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-vv-
2 Orange-Red
(Ull-7)
02
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: Orange-Block
(U17-11)
OJ
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J
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,
12
6
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,
,
,
4
: Orange-Yellow
(U17-9)
04
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17
,
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,
,
6
: Orange-Green
CU16-9) 05
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,
11
7
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Orange-Blue
,
7
(UIS-ll)
06
,
10
B
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,
,
,
1
Orange-Violet
,
B
(U1S-7)
D7
,
9
9
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: Orcnge-Cray
,
9
(U1S-5)
DB
8
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: Block
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_________________________
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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).
DEDICATED SWITCH CIRCUIT
CPU BOARD
J205
74LS240
470pf
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.
Dedicated
Input
I
Switch
L
H
B
c
A
H
L
H
L
pen
Closed