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. FLIPPER CABINET SWITCH CIRCUITS'
~rOWER DRIVER
,-
T
GRAY-YELLOW +12V
J139
BOARD
[
6
"
7 7
ORANGE
GROUND
,--
LEFT CABINET
C
3 3
13
CPU BOARD
4 4
BLUE-GRAY L. LEFT FLIPPER F4
1 1
11
OPTO BOARD
J 1
d c2__
BLACK-BLUE U. LEFT FLIPPER F8
9
J212
[~
,--
6
7
C
3
3 r- -
4 4
BLUE -VIOLET L. RIGHT FLIPPER F2
RIGHT CABINET
1 1
12
OPTO BOARD
J1 2 2 BLACK - YELLOW U. RIGHT FUPPER F6
10
c__.
'--
~
I~ - --- - ---- - -------I
I
Dedicated Input
I
I
+5V r+
12V
I
: HCT244
1K
:
~
FLIPPER -
OPTO BOARD ~
I
BLUE-XXX
I
Jl
I
I
BLACK-XXX
I
I
I
I
I
I·
I
I
CPU BOARD
H-=OR_::_:AN:_:_:G=E~~-t-__,
3
I
I
I
I.
I
L
~
I
I
I
I
I
I
L
_j
,- -- - -- -~ --- -JOgl
I
+
12V
2 GRAY- YELLOW
~QWE~ _DR~~~ _§OARQ _
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.