Arcade Collecting > Pinball
What does it mean when pinball machine says bad coil?
ChadTower:
--- Quote from: briguy on October 22, 2009, 10:21:16 pm ---You can test all the coils with a DMM to really see if its a bad coil.
--- End quote ---
How is that? The only way I have come up with is resistance vs a known good coil but there is very little info out there on just how far off a coil can be without being a problem.
shardian:
--- Quote from: ChadTower on October 23, 2009, 08:55:49 am ---
--- Quote from: briguy on October 22, 2009, 10:21:16 pm ---You can test all the coils with a DMM to really see if its a bad coil.
--- End quote ---
How is that? The only way I have come up with is resistance vs a known good coil but there is very little info out there on just how far off a coil can be without being a problem.
--- End quote ---
A locked coil is easy to test - just wrap your hand around it. You'll be remembering that locked coil for a looooonnnnng time.
I was under the impression that the resistance test and voltage lug tests were to check for breaks in the windings - IE, weak coils.
ChadTower:
--- Quote from: pinballjim on October 23, 2009, 09:47:02 am ---Breaks or shorts. You'll either get very little resistance or it'll be open.
--- End quote ---
That's only a BAD bad coil and you can tell that by looking at it - it's either locked on or the sleeve looks like velveeta. Don't need a DMM for that. I'm thinking about coils that are going bad since I generally work on games that need a thorough cleaning/shop. Not many spot repairs for me anymore.
roberts123, is a coil actually locked, or has the software simply reported a bad coil?
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