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TEST/DIAGNOSTIC PROCEDURES (Continued)
"On" State Logic - Special Solenoid
From
PIA
Spl Sol.
..n.:
Trigger 1J18
I
2N
Low,
4401
with flippers
-;- enabled
Sol. B+
1:~~
J
Special
Solenoid
-;- "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.
"On" State Logic - Controlled Solenoid
Sol. B+
1J1:
2
;3
Cntrld
Solenoid
-;- "ON"
"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
NC
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 NC Select Relay (sol. 12) must be energized,
the relay connects 'circuit C power' to eight group C solenoids
(OlC
through 08C). Now, driver
transistor
033
can actuate the Flash 1 circuit (sol. 01C). Using thiS "multiplexing"technique,
the same
driver transistor can control actuation of two separate (A side and C side) solenoid circuits.
Flash 1
Figure 4. Typical Solenoid
AIC
Select Relay Circuit, showing the function of
Solenoid
12,
the Solenoid AlC Select Relay.
ROLLERGAMES 33
-,