![]() 107 on the left and right leg, indicating that the transistor is bad. I checked Transistor Q25 and I got a reading of. I did some more research and it is my understanding that the old knocker coil could have blown a transistor on the driver board. When I tested the new knocker it failed to fire. I received my parts yesterday and last night I replaced the old Knocker assembly with the new one. Thinking that replacing the Knocker coil and assembly would solve the problem I ordered the parts from The Pinball Resource. It turned out the Knocker Coil, which had locked and burnt up. ![]() So far I have only had to re-due a couple of solders to the wires that connect to the left flipper coil.Ībout three weeks ago I smelled something burning. I am new to the world of pinball and a month ago I purchased my first Pinball Machine, a Gottlieb Joker Poker.
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