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I turned on my PX-350 this morning, played some bass notes, and had an awful noise come out of the speaker on a few bass notes (lowest F, for one). The same noise on "Line Out". The same noise on "Phones".

. . . And worse, the same noise when recording to the built-in USB drive.

So the problem is in the sound generator.

It occurs on most of the "Grand Piano" sounds, which I assume are based on the same samples. It doesn't occur on any other sounds -- E-pianos, organs, etc are all OK.


My sound sample (recorded on the USB drive, trimmed in Audacity but otherwise untouched):

https://soundcloud.com/cpcohen1945/take18-motorboating


I've checked the power-supply voltage (OK), and done a "factory reset".


I'm not the first person with this problem:

https://www.youtube.com/watch?v=zY2TvFKFbPQ


I'm leaving the DP on overnight, in hopes that something will fix itself.


. . . All ideas are welcome.

Thanks --


. Charles
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My first shot would be the power brick.


Kawai ES8, Roland RD2000, Yamaha AG06 mixer, Presonus Eris E5 monitors, Sennheiser HD598SR phones.
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Maybe it's reached the designated end of it's useful life? If it's a motherboard it'll cost a few hundred to fix it.


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That's a good first guess. In the days of linear power supplies I think it highly likely that this motorboating might be caused by a bad PSU.

I suspect, though, that the PSU here is a switch mode supply. I'm not sure whether such could cause the motoroboating.

Of course, there are other causes of motorboating. smile
https://i.imgur.com/huf6JrQ.jpg

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Originally Posted by MacMacMac
I suspect, though, that the PSU here is a switch mode supply. I'm not sure whether such could cause the motoroboating.


Mac3, there is no reason why a faulty switching supply could not cause a motorboating. Though not because of AC ripple like badly regulated linear supplies but in some cases it may oscillate. Believe me, I've been there already.

Last edited by EVC2017; 03/10/19 04:36 PM.

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Interesting problem, if the PSU is defective the motorboating should be heard on the other sounds also and not on the USB recording. You're right, it's probably the sound generator.

Usually PSU give 12 or 24 volts and there is a few DC-DC converters on the board to create other needed voltage. It might be a bad capacitor. They become dry or blow up.

Good luck.



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