Harlem Globetrotters On Tour
Bally, 1979You're currently viewing posts by Pinsider wayout440.
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Quoted from Chalkey:Why does the power return during test mode but the lights still don't work?
Keep in mind the basics of how these things,work. Voltage is applied to controlled lamps continuously. What makes them turn on is transistor switches that complete the circuit path to ground, allowing current to flow.
Quoted from Chalkey:except "same player shoots again" which is always on.
Start with this problem. This lamp should not always be on. If this lamp is on with only one of the lamp boards it is a probably a shorted SCR. If it is on with all of them, then there is probably something wrong upstream from that (MPU)
Quoted from Chalkey:Got it. The power is going away
What do you mean by "the power is going away" - lamps turning off? or something else. Please explain.
Quoted from Chalkey:If I manually ground individual sockets during the lamp test the grounded socket will blink like it is supposed to.
Hmm, this isn't right - you shouldn't have to manually ground a socket during lamp test. The lamps should all blink on their own. Sounds like you have a bad switched illumination return (ground)
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Berea, OH