Basic HTML Version
FLIPPER CABINET SWITCH CIRCUITS
~POWER DRIVER
[~
'6
GRAY-YELLOW +12V
J139
BOARD
7
ORANGE
GROUND
M
BOARD
I
LEFT CABINET
L
3 3
CPU
4 4
BLUE-GRAY L. LEFT FLIPPER F4
1
1
I
OPTO BOARD
Ji
..1...
.2_
BLACK-BLUE U. LEFT FLIPPER F8
1
I
J212
[~
c--
6
7
RIGHT CABINET
L
3 3 f--
4 4 BLUE-VIOLET L. RIGHT FLIPPER F2
1
1
12
OPTO BOARD
J1 2 2 BLACK-YELLOW U. RIGHT FLIPPER F6 10
'-- '--
'--
,------------------1
I
Dedicated Input
I
I
+5V
r+ 12V
I
: HCT244
1K
:
~
FLIPPER - OPTO BOARD ~
I
BLUE-XXX
I
J1
I
I
BLACK-XXX
I
I
I
I
I
I
I
I
CPU BOARD
H-0=R~AN=GE~ __ ,_~3
I
I
I
I
L
J
I
I
I
I
L
_j
,-- - ---------J1391
I
+12V
2 GRAY-YELLOW
~OWER _DR'!yE~ BOARD _
J
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
"+"
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