Basic HTML Version
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Coin Acceptor
J3
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or
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Control Switch
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DEDICATED SWITCHES
CPU Board
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J20S
Coin Door Interface Board
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Coin Acceptor
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J3
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Control Switche9
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Orange-Brown (U17-S) 01
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4
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Orange-Red (U17-7) 02
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2
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Orange-Black (U17-11) 03
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2
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: Orange-Yellow (U17-9)
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4
04
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7
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Orange-Green (U16-9) OS
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7
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6
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1
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Orange-Blue (U16-11) D6
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8
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7
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Orange-Violet (U16-7)
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8
07
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9
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Oranae-Grall
(16-5)
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Black
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DEDICATED SWITCH CIRCUIT
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CPU Board
+5V
Coin Door
Interface
Board
Oedicated Input
SWitch
Open
Closed
Coin Acceptor Switches
01 Left Coin Chute
02 Center Coin Chute
03 Right Coin Chute
04 Forth Coin Chute
Control Switches
05 Normal Function: Service Credits
Test Function: Escape
D6 Normal Function: Volume Down
Test Function: Down
07 Normal Function: Volume Up
Test Function: Up
08 Normal Function: Begin Test
Test Function: Enter
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 tie'i 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, its output is high
and the row is inactive.
Judge Dredd 3-3