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'On' State Logic - Special Solenoid
"On" State Logic - Controlled
Sol.B+
~ IP;;jJ
Cntrtd
Sol.
"ON"
Special
Sol.
"ON"
sa.s-
+25V~
lP19
BJI3
From
PIA
"Off' State - Special Solenoid:
The Special Switch Trigger Input goes low. Mean-
while. the PIAline remains high. The remaining
signals reverse their states.
"Off' State - Controlled Solenoid:
The Enable Input (from the PIA)goes low. Mean-
while. the BLANKINGsignal remains high. The
rest of the signals reverse their states.
NOTE
As directed by the game program. the Solenoid
A/C
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.
OIA), via the driver transistor Q33.
When the game program determines that the Solenoid
A/C
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. OIC), which has a lamp circuit.
Using this "multiplexing" technique, the same driver transistor can control actuation of two
separate solenoid circuits.
part of
Aux Pwr
Orn
Ball Lock
Flasher
Figure 4.
Typical Solenoid
AlC
Select Relay Circuit, showing the function
of Solenoid 12, the Solenoid
Ale
Select Relay
1-38 Test/Diagnostic Procedures