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TEST/DIAGNOSTIC PROCEDURES (Continued)
"On" State Logic - Special Solenoid
"On" State Logic - Controlled Solenoid
PI,",
7~407
~
~V
1.-5v ~ .. ~y
J+34V
-V- _ _
1~19
~IB
7
-0"
....4 0 1 _ .
S S. TR IGGER
1:-
~~
~
<
fla.i.
SPfCI"L
I~PUT
•.
LOW WI1[N
~__ TIP
122
SO~a~?'O
FLIPPERS [N~8LED
_~
1-3.11'1
+5'" +!IV
)
'RO~
•
PI"
....
14...
IJI \
']CONTR OLltO
~
,~~ 4
SOLENOW'OW"
- -:- ~
~ ~ o l!1 - r
r ....~~.
&LANK ING
1
~~'ZZ
"Off" State • Special Solenoid:
The Special Switch Trigger Input goes low. Mean-
while, the PIA line remains high. The remaining sig-
nals reverse their slates.
"Off" Stale - Controlled Solenoid:
The Enable Input (from the PIA) goes low. Meanwhile,
the BLANKING signal remains high. The rest of the
signals reverse their states.
NOTE
As directed
by
the game program, tha Solenoid
AlC
Select Relay (solenoid 12) switches
the solenoid B+ power between two power busses to permit actuating two groups of
solenoids at the proper times. In its de-energized state, the Relay connects the 'circuit A
power'to 16 "controlled" and "switched" solenoids (identified in the table with no suffix
letter or the letter A, after the solenoid number). Individual solenoid operation then
depends on the game program enabling the ground path for solenoid actuation via the
driver transistor associated with each solenoid circuit. For example, the game program
can actuate the Outhole Kicker solenoid (sol. 01A), via the driver transistor
033.
When the game program determines that the Solenoid
Ale
Select Relay (sol. 12) must be
energized, the relay connects 'circuit C power' to eight group C solenoids (01C through
OBC).
Now, driver transistor
033
can actuate the Ball Popper Flasher circuit (sol. 01C).
Using this "multiplexing" technique, the same driver transistor can control actuation of two
separate solenoid circuits.
System 11 A
CPU Board
5
033
(Drive
Transistcr,
Sol. 1,
Ate)
Al
i
\...._
_)
IBm-
Red
....t,.Vel
08 Sol. B+
DrlYE' Transistor,
Sol. 12
Figure 2. Typical Solenoid
Ale
Select Relay Circuit
BIG GUNS
29