Basic HTML Version
FLIPPER CABINET SWITCH CIRCUITS
POWER DRIVER
~
'7
GRAY-YELLOW +12V
0
J139
BOARD
L
6 6
r-
CPU BOARD
LEFT CABINET
4 4
BLUE-GRAY L. LEFT FLIPPER F4
2 2
11
OPTO BOARD
J1
t.i.
u.
BLACK-BLUE U. LEFT FLIPPER F8 9
J212
r- r-
6 6
C
4 4 r- ORANGE
GROUND
3 3
13
RIGHT CABINET
2 2 BLUE -VIOLET L. RIGHT FLIPPER F2 12
OPTO BOARD
J
1 1 1 BLACK-YELLOW U. RIGHT FLIPPER F6 10
~ ~
L-
I" ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~J
1391
I
+
12V
2 f-+--_G_RA_Y_-_YE_L_LO_W_-,----j
~OWER ~DR~E~ 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
+SV,
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
+SV,
its output is high and the row, (dedicated Input) is
inactive.
3-13