(Topic ID: 235302)

Haunted House Coil Prob

By davrol

2 years ago

Topic Heartbeat

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  • 22 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by mynameisbond
  • Topic is favorited by 2 Pinsiders


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#4 2 years ago

Also check A3j4 Connector. Pins 6 to 12 are connected to the coils you mention, and they may be rusty or broken...

#8 2 years ago

Did you check the 4 bridge rectifiers ?
What happens if you switch the pinball on after you have disconnected the boards (CPU, driver, etc...) ?

#10 2 years ago

Well, when the fuses blow as soon as you switch the pinball on, it is often due to a bridge rectifier shorted. In an HH, there are 4 bridge rectifiers located at the bottom of the cabinet, close to the fuses (which are direct connected to them).

As you are facing a coil problem, it is more than possible that the 24V and/or the 38V bridge rectifiers are burnt.

Testing a bridge rectifier is quite the same as testing 4 diodes and Marvin's bible explains how to do this perfectly.

However, the values you mention for the 4 diodes in-line on A2 are good.

#11 2 years ago

Oups, forgot the last question : No continuity sound when testing a transistor, but a value depending on the transistor type.

#14 2 years ago

Hi Davrol,
Reading between each prong should be around .6 (and 0 the other way). So I suggest you change the bridges with 1.99 or changing values.

I don't think it is a problem if you have continuity form a transistor, as long as it is soldered.

Oh, and if you have to change some BR, I suggest you also change the orange capacitor if it has not been done yet.

#16 2 years ago

Should be fine. Take care to respect polarity as the prong which is not the same direction than the 3 others is +. Its opposite is -. I made the mistake when I soldered a BR and the Fuse kept blowing.
Let us know if the fuses still blow instantly after BR are changed

#22 2 years ago

Good to know guy ! I will need to talk to Bob too, as my HH is still soundless and F4 fuse still blows when the ball enters cellar (and I can't see any trouble with the "U" relay).

Investigations still in progress for me,

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