(Topic ID: 329216)

Over voltage at Test Points (TPs) Question. Please Help?

By TevB

1 year ago


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  • 33 posts
  • 10 Pinsiders participating
  • Latest reply 1 year ago by Quench
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#13 1 year ago

I believe you, as mentioned, should jumper the transformer to suit your mains voltage by changing 2 of the jumpers on the transformer.

Easier to do with the transformer panel removed from the machine.

2 to 8 will stay the same
remove the jumper 3 to 6 and add a jumper from lug 4 to lug 6.
remove the jumper 7 to 10 and add a jumper from lug 7 to lug 11.

This will reduce the voltages.

#24 1 year ago

when you turn her on, do you notice a coil lock on, like a target reset coil or a ball eject coil or any coil? No coil on the playfield should be permanently on upon boot up going into attract mode.

to reduce or possibly eliminate any excess noise/hum, try removing the sound/speech from there mounting positions on the backboard, carefully let them hang and start her up and see if the hum is reduced if not gone? Express extreme care when leaving a board hang so that there isn't any chance of the rear circuitry touching something it shouldn't, if in doubt, as the board may move from your original resting position, isolate it with say a piece of cardboard?

#32 1 year ago

have a look under the playfield where the suspect lamp holder/s is, see if a related wire nearby has for instance a blob of solder causing a short?
Check the solder tab isn't touching anything other than the wire soldered to it. If you're unsure take some clear pics and upload them.

how confident are you with a multi meter? assuming you have one.

Search Bally Pinwiki and it will have numerous manuals you can check out that will have parts used in your machine.
https://www.pinwiki.com/wiki/index.php?title=Bally/Stern

Regarding humming, which appears to 'noise', with the machine off, try unscrewing the sound/speech board from the ground mounts, letting it hang and being super cautious the rear isn't touching anything, you could put some cardboard behind it, or with it on and one screw holding it in place, undo that one screw with one hand, holding the speech board in the other, pull it ever so slightly from the mounting points and hear if the humming is reduced or even gone?

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