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"On" State Logic - Special Solenoid
"Off"State - Special Solenoid:
The Special Switch Trigger Input goes low. Mean-
while, the PIAline remains high. The remaining
signals reverse their states.
·On
U
State Logic - Controlled
"00' State - Controlled Solenoid:
The Enable Input (from the PIA)goes low. Mean-
while, the
BLANKING
signal remains high. The
rest of the signals reverse their states.
NOTE
As directed by the game program, the Solenoid
Ale
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.
o
lA), via the driver transistor Q33.
When the game program determines that the Solenoid
AIC
Select Relay (sol. 12) must be
energized, the relay connects 'circuit C power' to eight group C solenoids
(OIC
through
OBC).
Now, driver transistor Q33 can actuate the Flasher circuit (sol.
Ole),
which has two lamp
circuits. Using this ''multiplexing'' technique. the same driver transistor can control actuation
of two separate solenoid circuits.
pert of
AuxPwr
Orn
Top Center Lane &
Insert Teeth Flashers
Figure 4.
Typical Solenoid
AlC
Seled Relay Circuit, showing the function
of Solenoid 12, the Solenoid
AlC
Seled Relay
1-38 Test/Diagnostic Procedures