Black Pyramid
Bally, 1984Hey y’all,
Got an intermittent (loud) buzz on my solenoid expansion board… real quick buzz when flippers are pressed, or outhole kicker fires. Doesn’t stay when the flipper is held down, only when it’s first energized. Can feel it when my finger is on the relay. Reflowed all connector pins. Everything still functioning as it should. Time for a new board? Or is there something else I should be looking for? Thanks in advance!
does it operate fine, on/off/on/off in lamp test?
does the bulb nearby turn on and off as it is energised?
check rear of the lamp driver board header pins for any dry joints, J3 pin 11 is the for the relay, also check the SCR on the lamp driver Q54 i think (print is tiny) that works the relay.
check inside the relay plug itself that none of the pins are broken
Checked the SCR (Q14) by shorting the anode to ground, still makes the same buzz, interestingly, the modern board/relay seems way more sensitive to it. I should reiterate, it is turning the swinging target on the way it should, the machine plays perfectly, it just sounds awful
looking at an Eight Ball Deluxe schematic Q14 is for the 1 rack.
Q54 is for the solenoid expander board.
what game is this for?
Quoted from Rikoshay:looking at an Eight Ball Deluxe schematic Q14 is for the 1 rack.
Q54 is for the solenoid expander board.
what game is this for?
According to subject line, black pyramid.
Quoted from Rikoshay:of course, my bad, lack of attention to detail, not the first time
and looking at the schematic i am wrong, for Black Pyramid Q14 is the transistor for the solenoid expander that controls the swinging motor.
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San Jose, CA
