(Topic ID: 134864)

Humming Coils


By PatrickATX

3 years ago



Topic Stats

  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 3 years ago by markmon
  • Topic is favorited by 1 Pinsider

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#1 3 years ago

Newbie question, but here goes: My Funhouse Rudy has 4 SM-30-1100-DC coils which work the eyes and lids. As the eyes move there is a lot of humming from at least one of the coils. Is it time to replace them? I'm not sure how much humming is normal since I'm pretty new.

-Patrick

#2 3 years ago

Humming coils is fine. Coils don't gradually die. So if it's working at all it's ok. The hum comes from two prong coils where holding the coil on has to be done via pulsing the power to avoid overheating the coil. As the coil stops age (or are new until they age, it just depends), the gap between the stop and plunger can be such that the pulsing causes a hum sound.

#3 3 years ago

So, if I don't like the humming, I might be good to install a couple new ones and quiet them down? I realize it's much quieter in a home compared to an arcade, so I hear a lot more. But Rudy's eyes are a humming distraction.

#4 3 years ago

I owned a nice FH for almost 15 years. Hum/buzz becomes apparent when eyelids open WIDE and when eyes are turned to one side. Nothing to be concerned with.

#5 3 years ago

No. Replacing a coil will not impact humming. You could try rebuilding all the mechs. But that feels like a waste of time for this "problem". Why not just turn up the volume and enjoy the game. Pinballs make noise.

#6 3 years ago

Ah....good point...yeah it's the eyes turning...the eyes DO drift a bit, and I read somewhere someone else fixed that problem. But otherwise, I'll turn up da volume!

#7 3 years ago
Quoted from markmon:

No. Replacing a coil will not impact humming. You could try rebuilding all the mechs. But that feels like a waste of time for this "problem". Why not just turn up the volume and enjoy the game. Pinballs make noise

try and see if the coil stop is worn bad , if it is replace, hum go bye bye ...

#8 3 years ago

Humming coils? It's because they don't know the words......

anyone, anyone? <crickets>

Never mind, carry on.

1 month later
#9 3 years ago
Quoted from PinFever:

try and see if the coil stop is worn bad , if it is replace, hum go bye bye ...

My 24 hums with new coil stops. There's no guarantee. It's just a side effect of the stern flipper designs. They may make some noise. Pinballs are noisy machines.

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