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Yamaha TX816 synth, high-pitched whining in power supply Rackmount Synthesizers
Old 22nd December 2010
  #1
Yamaha TX816 synth, high-pitched whining in power supply

So I'll turn on my TX816 synth, and a few minutes later, the power supply starts making this unbearably loud, high-pitched noise like an old CRT TV only much worse. It is not in the audio signal, it's physically coming from the power supply.

Any idea what is causing this? Could it be that a transformer has come loose and is buzzing against the chassis or something? Thanks!

Chris
Old 22nd December 2010
  #2
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S2udio's Avatar
 

Switch mode PSU ....
Time for a recap
Old 22nd December 2010
  #3
Well that should be easy enough. I'll try that, thanks for the tip!

Chris
Old 28th December 2010
  #4
Fixed! While I was re-capping, I noticed the transformer core had come loose from the windings. I stuffed the gaps with silicone-based rubber cement. That, and/or the new caps, have made it a totally silent power supply once again.

Chris
Old 4th January 2011
  #5
Unfortunately, I spoke too soon--the noise is back. D'oh

I replaced all the electrolytic caps in the power supply. I coated every coil and transformer with silicone sealing glue. No change. Maybe the silicone glue is not solid enough? Should I try something that dries rock-hard instead? Any other ideas appreciated...

Chris
Old 4th January 2011
  #6
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Altitude909's Avatar
 

does it do it with the top off? It may be mag leakage from the transformer causing the case to vibrate. My Tx81z did this pretty badly. Here is my fix: Piece of steel bent over the top to the transformer.

Old 6th January 2011
  #7
Neat idea, Altitude - The transformer in my synth is probably too far from the case to cause magnetic vibrations, but it couldn't hurt to try this.

Chris
Old 6th January 2011
  #8
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Altitude909's Avatar
 

Its actually in the TX81z service notes..
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