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DEDICATED SWITCHES
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Coin A c ceptor or
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Control Switches
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Coin Acceptor
Switches
01 Left Coi" Chute
02 Cen ter Co in Chute
03 Ri ght Co in Chute
04 Fourth Coin Chu te
Contrp l Sw jtches
05 Normal
Function : Service Credits
Test Fun ction: Es cape
Norma l Func tion : Vo lume Dl)wn
Test Function: 00*0
Normc l
r
unction : Vo lume Up
Tes t Fu nction : Up
Normol
Function : Begin Test
Test
Function:
Enter
J205
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Oronge-Brown
(U I7-S)
06
07
DB
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Control
Switches
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Switch
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Closed
Ora nge-B lack
(Ul1- ll ) 03
12
Orange-Ye llow (U l1-9)
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11
Orange -Green
(UI6-9)
05
1 1
Orcnge-Blue
(UI6-11)
06
10
Oronge-Violet
(UI6-7)
07
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3-3
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.
(UI6-S)
08
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DEDICATED SWITCH CIRCUIT
74LS240
I
470pf
Black
B
C
A
H
L
H
L
L
H
Off
On