![]() ![]() Transistor NPN 8.0a 100v TIP102 2N6045 Transistor used on many. NPN transistor for early solid state Bally and Stern pinball machine High Voltage power supply. ![]() ![]() My Games Sign In 1-80 Contact Us Knowledge. If the pull down resistors have failed open, that could cause an issue, but that seems unlikely.Ī failure of the HCT273 is possible, but if the other flashers work correctly, it seems unlikely to me. Browse over 30,000 in-stock pinball parts at Marco Specialties. I can't think of any way the series diodes or series resistors could be a problem. This should not be the case if there's no voltage at the base.Īnother thing you can check if you're comfortable working on it powered on (please check there's no exposed high voltages inside, I don't know pinball machines!), is whether there is voltage on the base (the far left pin of the transistor) with respect to ground. If you see a ~0.6-0.7V voltage drop, then the transistor is "on". Our online store offers a wide selection of high-quality pinball replacement parts for various pinball machines, sorted by game and manufacturer. A TIP122/102 transistor on the CPU board energizes the. Swap the leads of the multimeter and it should still read OL - no conductivity in either direction. For games without Auxiliary power driver boards, most games use relay boards to power the 50 volt coils. If you have a multimeter, I would try checking that the collector and emitter are not shorted - using diode mode, check the center and right pins (facing the front of the transistor) - it should read "OL" or similar for open circuit. Terry lists a replacement transistor for LOTR pinball. ![]() expander circuit.Do they stay on all the time, sometimes, something else? Is it only the two flashers staying on? Do the others work fine? Slow it down, lower the voltage.Īlso, from the other thread, yep, leaving the series diode off the coil will trigger solenoids from the other 4 pairs of the sol. Transistor used on various pinball machine driver boards. My Games Sign In 1-80 Contact Us Knowledge Center Track Order Blog Shop By Game. The point is that the flyback voltage spike developed by the coil is directly proportional to the switching time. If everything is hooked up correctly, and you are ready to have the time of your life playing pinball, all you have to do is cd into the launch directory and type roslaunch automaticpinballc. Browse over 30,000 in-stock pinball parts at Marco Specialties. This cap slows down the transistor turn off by feeding some of the rising collector voltage back to the base and so trying (in vain) to keep it turned on. So either the transistor is being commanded to turn on for too long (switch short/software glitch/harness prob etc.) and being heated in to failure, or its a death spike from the solenoids turning off.Įither the catch diode open circuit across the right saucer coil itself or the one across the 2nd blue inline drop target could cause this.Īlso, might be worth checking/replacing the cap across the transistor base/collector. The only high volts path is collector base shorted. That resistor has blown from sudden high volts, not slowly cooked. Learn from the comfort of your home Learn to fix your pinball like a professional Williams/Bally WPC System, Williams/Bally WPC 95, Stern SAM System. I think the melted coil in the 'smoking fathom' thread is an effect rather than a cause and that something is killing your transistors. SFAN Series (Single Fans) Tibetan Breeze Series (Economy Line) Zen Series (Premium Line) Pinballs PinGuard Store PinGulp Beverage Caddies Playfield Parts. ![]()
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