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TEST/DIAGNOSTIC PROCEDURES (Continued)
"On" State Logic • Special Solenoid
"On" State Logic • Controlled Solenoid
Sol.
B+
+2:VS
1J1~
Special
Solenoid
~ "ON"
+5V
Sol.
B+
+
25V
-s
1J19
BJ--}
Cntrld
"ON"
"Off" State - Special Solenoid:
The Special Switch Trigger Input goes low. Mean-
while, the PIA line remains high. The remaining sig-
nals reverse their states.
"Off" 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. 01A), via the driver transistor 033.
When the game program determines that the Solenoid
AlC
Select Relay (sol. 12) must be
energized, the relay connects 'circuit C power' to eight group C solenoids (01 C through
OBC). Now, driver transistor 033 can actuate the Bottom Right Flasher circuit (sol. 01 C),
which has two lamp circuits, one to the Insert Board and one to the playfield. Using this
"multiplexing" technique, the same driver transistor can control actuation of two separate
(A side and C side) solenoid circuits.
Bottom
Right
Flasher
J
--..,.
Figure 4. Typical Solenoid
AIC
Select Relay Circuit, showing the
function of Solenoid 12, the Solenoid
AIC
Select Relay.