Basic HTML Version
FLIPPER CABINET SWITCH CIRCUITS
LEFT CABINET
OPTO BOARD
POWER JRiVER
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ORANGE
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CPU
BOARD
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4
+
BLUE-GRAY _. LEFT =-UPPER
F4
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1
111
2
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BLACK-BLUE U. LEFT FLIPPER F8 9
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J212
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~LUE-VIOLET
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L. RIGHT FLIPPER F2
1121
11
12 BLACK- YELLOW U. RIGrlT FLIPPER F6
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03
1
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RI,GHT CABINET
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II
OPTO BOARD
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Dedicatee Input
:
~+5V
lKr+
12V
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1N4148
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LMJ39
470pf0"
:
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1
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~------------------~
CPJ BOARD
BLUE-XXX
BLACK-XXX
~FLiPPER -
OPTO BOARD ~
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ORANGE
1- - - - - - - -
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+12V
2 I GRAY-YELLOW
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470
The flipper switch circuits operate similar to the dedicated switch circuit. The circuits are active low and
tied to ground through the switch circuit.
When a switch closes, the row side (dedicated input) of the circuit activates. The
"+n
input to the LM339
drops below +5V, therefore, its output is low. Since the row, (dedicated input) circuit 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, its output is high and the row, (dedicated Input) is
inactive.
3-13