Machine Buzzes When Reels Spin. Is it the Speakers or the Reels? Video Included

[DB26]

Hello everyone. I just got my first machine last week. When I spin the reels I have this loud buzzing noise. I can’t tell if it’s the reels or in the sound system. And on a side note, every now and then when the machine is completing a spin, the audio goes to complete garbled, white-noise digital trash sounds. (The best I can describe it, haha)


Anyway, here is a video of my machine spinning and the buzzing noise that accompanies it:


https://youtu.be/HCIltIahjpU




I posted this in the general / welcome area, thought I should repost here to introduce myself. My name is Robert and I’m hoping to learn all I can about these amazing machines. I am somewhat technically inclined, so I think so should catch on quick. I hope to get another machine in the future. (Would love a Top Dollar)My other hobby is restoring my 1926 Dodge Brothers automobile. I Hope to make friends and interact with you all as I convert my Sizzling Sevens back to taking coins and acquire other machines.

After doing some research (before I joined here) I bought a Key31 and IVC00097 chip for my machine, I hope these work for me. And a BIG thank you to forum member Ken, I now have a new 25 cent coin comparitor on the way to me. Pictures in my machine and Dodge coming soon!

[sixcardmark]

Sounds like a 502a mpu.  They have that buzzing problem with a sound card installed.

[qbert]

Read about it here
http://newlifegames.com/nlg/index.php?topic=324.0

[DB26]

Thank you. Interesting fix, but definitely something I can do. Would the pot go directly in line with the speaker wire? If so, positive or negative side? Or does it matter?

[qbert]

Yes in line but to be honest it's a band aid and really doesn't work that well. Replacement with a 504b board is the true fix.

[DB26]

I guess I’ll post in the wanted section for a 504b board. Thanks for the insight.