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'On' State Logic - Special Solenoid
'On' State Logic - Controlled
From
PIA
$ol.B+
+25~
1P19
I1.
Cntr1d
Sol.
''ON''
"Off' State - Spedal Solenoid:
The Special Switch 1i1gger 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)goeslow.Mean-
while, the BLANKINGsignal remains high. The
rest of the Signals reverse their states.
NOTE
As directed by the game program. the Solenoid
A/e
Select Relay (solenold 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 tbe 'circuit A power' to 16
"controlled" and "switched" solenoids (tdentifted 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 eolenoid
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
AIC
Select Relay (sol. 12) must be
energized. the relay connects 'circuit C power' to eight group C solenoids (OIC through OaC).
Now. drtver transistor Q33 can actuate the Transporter Flashers circuit (sol. OIC). which has
two lamp cfrcuits, one to the Insert Board and one to the playfteld. USing this "multiplexing"
technique. the same driver transistor can control actuation of two separate solenoid circuits.
Orn
,J
__ J.
Figure
4.
Typical Solenoid Ale Select Relay Circuit. showing the function
of Solenoid 12. the Solenoid AlC Select Relay
1-38 Test/Diagnostic Procedures