(Topic ID: 250796)

Harlem Globetrotters help please


By Don44

42 days ago



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#5 42 days ago
Quoted from Don44:

I took a look and there is not a transistor at Q18. Is there supposed to be one there? Could it not being there cause the coils to lock on? Any idea what transistor it is?

That's for an unused coil spot on your game, don't worry about that. The main driving transistors can be replaced with Tip 102's.

You should check out the predriver chip though as well. You can test things out by removing the large connectors from the board (leave the smaller ones to the right) so that you don't blow the fuse again, with either a logic probe or a volt meter - you're looking for shorts to ground on the pins that go to the game, and the 3081 chip's pins.

Head to pinwiki.com and look in the bally/stern section for information on how to do this or search for it here. Basically you're going to have shorted driver transistor, shorted pre-driver chip, or a bad decoder (unlikely).

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