Stern Pinball I/O POwer Driver Board blowing Bridge Rectifier + Fuses (f21, F20, G1)

DreamTR

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Stern Pinball I/O POwer Driver Board blowing Bridge Rectifier + Fuses (f21, F20, G1)

Fuses keep blowing on this and bridge rectifier keeps blowing. Replaced both twice, everything else checks out on the boards...anyone have any ideas? This is 520-5137-00 Stern board from a Lord of the Rings
 
Do the fuses just blow out on power up or when you are playing a game ( or in test )??


If on power up something is shorted to the 50v line.

If playing then it looks like one ( or more ) of your high power coils ( 50volt ) is giving you problems, or check the voltage on the output of brdg1, it should be around 50v or so, if it's wrong that will cause fuses to blow. Coils 1-11 are using that 50v, do you have a manual to see what they are? Magnet, tower, all the VUK's, bumpers.....
 
Thank you, that was it!

Well, the fuses keep blowing and it's the only thing that wasn't testing out...
 
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