(Topic ID: 146922)

Rotten Dog Power Supply causes Speaker hummmm

By kilmarnock1350

3 years ago

Topic Stats

  • 5 posts
  • 5 Pinsiders participating
  • Latest reply 3 years ago by PinballManiac40
  • Topic is favorited by 2 Pinsiders


Linked Games

#1 3 years ago

Just installed a new Rotten Dog Power Supply in an F14. Power works perfect, but the left speaker has a constant hum to it now. It's loud enough to be irritating, this was not the case prior to the install.

Any thoughts?

#2 3 years ago

Bad ground on sound board???
poor filtering in the switching supply...

#3 3 years ago

Make sure every board is securely screwed down to the back box ground plane.
BTW...the old WMS PS is far superior to the RD PS. You should consider repairing your old PS. The PinWiki outlines how, or I can fix it for you.
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#4 3 years ago

Access to a scope? You may find the 12v supply (which drives the sound amps) to be noisy when using the rottendog board.

#5 3 years ago

I had a bad experience with loud speaker hum on System 11 games with new Rottendog boards. The hum was not affected by the volume pot at all. I ended fixing my original Williams power supply and the hum was reduced greatly back to normal.

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