(Topic ID: 182920)

Annoying Hum Through Speaker


By Creagen

2 years ago



Topic Stats

  • 14 posts
  • 5 Pinsiders participating
  • Latest reply 2 years ago by Riptor
  • Topic is favorited by 2 Pinsiders

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50sndboardkiss (resized).jpg

#1 2 years ago

Is there any way to get rid of this annoying sound? I've attached a link below to a video so you can see and hear what I'm talking about. My machine had a subtle hum to begin with but I just added the new Alltek lamp driver board and it became much louder and more noticeable.

I'd love to hear your opinions. I believe it's the transformer sound running through the speaker.

Video - https://vimeo.com/206793273

Updated Video! This is what it sounds like now after trying what Quench suggested. Much better but something is still humming. - https://vimeo.com/207215612

#2 2 years ago

Did you replace all the caps on the sound board?
If these are originals, they should be replaced.
That will most likely take away the humm.
They are more than 37 years old and are more than 20 years over their lifespan.

#3 2 years ago

Try this as well - it's a common easy solution to reduce the hum on those Bally sound boards:
https://pinside.com/pinball/forum/topic/kiss-pinball-79/page/3#post-3624637

#4 2 years ago
Quoted from Quench:

Try this as well - it's a common easy solution to reduce the hum on those Bally sound boards:
https://pinside.com/pinball/forum/topic/kiss-pinball-79/page/3#post-3624637

Thanks for the info! I'll try removing those two screws and pulling the sound board away from the metal frame at the screw points. I'll let you know if it does the trick!

#5 2 years ago
Quoted from Inkochnito:

Did you replace all the caps on the sound board?
If these are originals, they should be replaced.
That will most likely take away the humm.
They are more than 37 years old and are more than 20 years over their lifespan.

inkochnito Thanks for the info! I haven't tried that. I've attached a picture of a sound board below (not my sound board), would you mind showing me where the caps are? I tried searching around on Google but I couldn't find a video or anyone replacing caps on this specific sound board.

50sndboardkiss (resized).jpg

#6 2 years ago

Looks like the sound board has been re-capped. Try isolating the sound board as mentioned before, it worked for me.

#7 2 years ago
Quoted from pinkid:

Looks like the sound board has been re-capped. Try isolating the sound board as mentioned before, it worked for me.

pinkid Sorry, that wasn't a picture of my soundboard. I was just using it as a example to find out what "caps" were until I realized "caps" meant capacitors. I'll try isolating the sound board first and then if that doesn't work, I'll look at replacing the caps. More importantly, what did you use to insulate the sound board? Did you use fiber washers on both sides of the sound board (front and back)?

#8 2 years ago
Quoted from Quench:

Try this as well - it's a common easy solution to reduce the hum on those Bally sound boards:
https://pinside.com/pinball/forum/topic/kiss-pinball-79/page/3#post-3624637

quench Would you mind sharing the size of the fiber washers you purchased? It will save me from having to take the backglass off and look before I go to Home Depot.

#9 2 years ago

After doing what quench suggested I do (https://pinside.com/pinball/forum/topic/kiss-pinball-79/page/3#post-3624637), the hum almost went completely away! Thank you so much!

#10 2 years ago

Glad it helped to resolve the issue

Quoted from Creagen:

would you mind showing me where the caps are?

FYI, the capacitors are the five blue components on the board.

Quoted from Creagen:

Would you mind sharing the size of the fiber washers you purchased?

Insulation washer is 5/32 (4mm) hole. You could probably make them but cutting some mylar or thin nylon if you have it - anything that you can use to isolate the circuit board from the metal backing.

#11 2 years ago

quench Would you recommend putting washers on any of the other boards? The hum went away immensely but i'm still hearing a faint hum. Not sure what it's from. Would you mind taking a look at my updated video? https://vimeo.com/207215612

The more noticeable hum seems to happen when the four KISS letters all light up at the same time on the back box.

#12 2 years ago

I feel as if the hum is coming from whichever board is controlling the middle lights which I believe is the lamp driver board. Also, i think it's coming from whichever board controls the KISS sequential letters in the back box. I thought I heard somewhere that the KISS letters are on a separate board than the mpu. Maybe if I put washers on those two boards, the hum will be gone completely?

#13 2 years ago
Quoted from Creagen:

Would you recommend putting washers on any of the other boards?

No. The other boards need good ground connection at the screw mating points.

The level of noise you're getting sounds about normal. You'll never get it super quiet. Just remember these were designed for noisy arcades, so hi fidelity sound wasn't a design priority.
With the game all closed up you should barely hear it.

You can replace the capacitors on the sound board if you want - probably a good idea if they're original 40 years old, but I don't expect much noise reduction over what you have: Note, these capacitors are polarised (must be connected the right way around).
https://www.greatplainselectronics.com/proddetail.asp?prod=BALLY-S32E-KIT

1 week later
#14 2 years ago

I used nylon washers and nylon screws to attach the sound board on my kiss. It cured the hum on mine.

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