Basic HTML Version
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DEDICATED SWITCHES
C
-P-O--B~-~~d-'
----------_.
-------_.
Coin Acceptor
Coin Door Interface Boord
Control
Switche
J205
J1
JJ
..,
: Orange-Brown
(U17-5)
D1
,-
f-----o'o--
14
4r-
:
2
Orange-Red
(U17-7)
D2
13
5
3
Orange-Black
(U17-11)
D3
12
6
-<.>v-
4
Orange-Yellow
(U17-9)
D4
17
!-<.>v-
6
Orange-Green
(U16-9)
D5
11
7
7
Orange-Blue
(U16-11 ) D6
10
B
-<.>v-
B
Orange-Violet
(U16-7)
D7
9
9
:
-<.>v-
Orange-Gray
(U16-5)
DB
:
9
B
11
-<.>v-
____e- ~
: Block
15
3
~
~
,
,
,
,
,
,
,
,
L
J
DEDICATED SWITCH CIRCUIT
r--~-~~---~-~~~~-------------------------------------------------------------1
0'
s
Coin Acceptor Switches
01 Left Coin Chute
D2 Center Coin Chute
D3 Right Coin Chute
04 Fourth Coin Chute
Control
Switc~
05 Normal
Function: Service Credits
Test Function:
Escape
06 Normal
Function: Volume Down
Test Function:
Down
07 Normal
Function: Volume Up
Test Function:
Up
DB Normal
Function:
Begin Test
Test Function: Enter
r-------------------------,
,
,
'COIN DOOR '
INTERFACE
BOARD
J
1
J3
!
Coin Acceptor
or
i
Control
Switches
1----1 X
f-;-----{j
+5V
J205
A
I
Dedicated Input
Switch
Off
On
B
C
A
Open
Closed
H
L
H
L
L
H
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.
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