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TEST/DIAGNOSTIC PROCEDURES
(Continued)
"On" State Logic - Special
Solenoid
"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
"Off" State - Controlled Solenoid:
The Enable Input (from the PIA) goes low. Mean-
the BLANKING signal remains high. The rest of the
signals reverse their states.
NOTE
As directed by the game program, the Solenoid AlC 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. alter the solenoid number) . Ind ividual 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 Outhol e 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 (01C through
OeC).
Now. driver transistor
033
can actuate the Pin-Bot Flashers circuit (sol. 01C),
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
solenoid circuit s.
Syste~
118
CPU Board
D-11883
Figure 4. Typical Solenoid
AIC
Select Relay Circuit, showing the
function of Solenoid 12, the Solenoid
A le
Select Relay.
JOKERZ
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