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(Topic ID: 259015)

Chicago coin bronco blowing line fuse


By the96stang

11 months ago



Topic Stats

  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 11 months ago by HowardR
  • No one calls this topic a favorite

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#1 11 months ago

Anyone have any idea why an EM would blow a line fuse? I have continuity between both points that the line cord is supposed to be soldered to. The line cord has already been removed and the play field and back box are unplugged.

Do I have a bad transformer?

#2 11 months ago

While you're figuring it out, make one of these Fuse circuit breaker
http://www.pinwiki.com/wiki/index.php?title=EM_Repair#Electrical_short_troubleshooting_Fuse_helper

#3 11 months ago

Got one.

How do I narrow this down.

#4 11 months ago

Your transformer could have a short. Try unsoldering the secondary (Low Voltage) wiring and see if it blows the line fuse. If it does with nothing connected to the output, you will need to replace the transformer.

#5 11 months ago
Quoted from the96stang:

Do I have a bad transformer?

Chances of having a bad transformer is very slim.
Is this a machine that you just start working on?
Do all the coils work freely and not look burnt?
Wouldn't think its the score motor windings..
You can unplug the head and playfield. If it still
blows, you know it has to be in the lower cab.

#6 11 months ago
Quoted from Mopar:

Chances of having a bad transformer is very slim.
Is this a machine that you just start working on?
Do all the coils work freely and not look burnt?
Wouldn't think its the score motor windings..
You can unplug the head and playfield. If it still
blows, you know it has to be in the lower cab.

Everything is unplugged minus the bottom board of the cabinet.

When I disconnect the LOW line and test right on the transformer I have continuity between the high and low windings on the transformer. I am assuming I should not.

Also, with that one lug disconnected on the transformer all of the coils now have the appropriate resistance.

#7 11 months ago

If all else fails, you can disconnect all the transformer wires, and hook up the input through a fuse. If that fuse blows with power you have a bad transformer.

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