Basic HTML Version
DEDICATED SWITCHES
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CPU
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BOARD:
(U17-5 )
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COIN DOOR :
INTERFACE
:
J1
BOARD
J3
D1
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4
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5
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12
6
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11
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10
8
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Black
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(U17-S)
08
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Coin Acceptor Switches
01 - Left Coin Chute
02 - Center Coin Chute
03 - Right Coin Chute
04 - Fourth Coin Chute
Control Switches
05 - Normal Function, Service Credits; Test Function, Escape
06 - Normal Function, Volume Down; Test Function, Down
07 - Normal Function, Volume Up; Test Function, Up
08 - Normal Function, Begin Test; Test Function, Enter
DEDICATED SWITCH CIRCUIT
SWITCH
OFF
ON
,------------
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COIN DOOR
: INTERFACE
: BOARD
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CPU 30ARD
+5V
LS374SC
+12V
OPEN
CLOSED
J205
CO;r'
Acceptor
or
Control
Switch
J4LS2t.O
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Cec:cctec Inout
The dedicated switches operate similar 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 the 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, it output is high and the row is inactive.
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