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Author Topic: Help me put the smoke back in  (Read 2217 times)
jbshocks
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« on: November 07, 2011, 10:09:28 PM »

I got a Universal Ultra board in with a batch of parts that had previously had a thermal event with visual effects.  I was not concerned with the problem area.  It ran all the lights on the buttons.  I removed the burned up IC socket and didn't replace it yet but I decided to power up the board.  It did a ram clear and took bills but not coins.  I hit bet max and I got real sounds but the reels made no attempt to move.  This is just some back ground the real issue is what I caused in my diagnosis.  I was attempting to do a meter reading on ch 3 in the picture and didn't take the time to switch to proper probes.  I shorted  CH7 to CH 3 with a meter probe and heard it go pop and then the BV light went out.  In hind sight I clearly had voltage or the light wouldn't have been on but now no voltage.  What in the pictured circuit could have failed?  I can't image it being the caps so that only leaves those 2 little noise filters.  Does it seem like logically that one of those could have made and audible pop?  They have no visible damage.  How do you test those?  Can I bypass it and see if the voltage comes back? 

I will also add that I put the original board back in the machine and all is well so the issue is on the board.


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poppo
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« Reply #1 on: November 07, 2011, 10:58:07 PM »

I can't image it being the caps so that only leaves those 2 little noise filters.  Does it seem like logically that one of those could have made and audible pop?  They have no visible damage.  How do you test those?  

They just have inductors in them so they should measure just a few ohms from each input to output. If one is open, you 'might' be able to get by with just jumpering them.
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