(Topic ID: 137985)

Coils and diodes

By rwarren28806

8 years ago



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#1 8 years ago

In doing a restoration, there was an incorrect coil installed. When I purchased the correct one, I assumed (yea I know) that the diode was installed in the same direction. When the coil didn't fire, I noticed the problem. My question is can I simply swap the wires leading to the coil or do I need to turn the diode around (painfully I'm sure as I see how it is wrapped around the coil terminal)? This is the kick back coil and not a flipper coil.

#3 8 years ago

I did blow a fuse so hopefully that saved everything else.

#5 8 years ago
Quoted from vid1900:

Just swap the wires, the coil itself does not know the direction of the diode installed upon it.
But if the game was run with the wires backwards, you may have blown a driver transistor. So don't panic if the game does not instantly work correctly after the wire swap.

As you anticipated, the coil did not fire. I ran the diagnostics in automatic mode. I let it circle around a couple of times to see if everything else worked. No other issues. I changed over to manual mode. I could hear the relay clicking but the coil did not fire. It then blew the fuse again as I figured it might. The fuse is on the flipper power board and when it goes it also stops the hideout coils from working also. So it appears that this is my core problem. There is also a fuse between the kickback and the flipper board which should have blown but someone put in a 25 amp rather than a 2 1/2 amp fuse.

As I'm still kind of new to all of this, I have a couple of follow up questions. What is the possibility that the relay is blown? Where would the driver transistor be located (on the board with the fuse possibly)? How would I go about checking it?

Thanks in advance for your help.

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