Whooping sound. Is this repairable?
When powered on, the unit emits high pitched whooping sounds (see video). I opened it up, hoping to see something obvious, but everything seems fine for a 25yo device. It does this both on battery and on Wall plug. Suggestions?
I don't have access to an oscilloscope, just a soldering iron, multimeter and limited understanding.
5条评论
Try the multimeter on the speaker cones or output, and see if the voltage output fluctuates.
由 Jessica Parnelli Fawkes 完成的
Thanks for the reply. I tried it and saw that it indeed fluctuates. My meter is digital, so exactly how much is hard to say, but I saw over 6V values. What does this mean?
由 Okeribok 完成的
Maybe a damaged amp circuit? It could be thinking there's a signal, and amplifies to max, then resets. Or maybe interference from another device?
由 Jessica Parnelli Fawkes 完成的
Yes, that sounds about right. there appears to be done sounds, but that gets mangled and only one channel works. Could it be a capacitor or something? Like replace one component and it works again? Is there a way to test components without removing them? There are no visual effects (leaks, discolouration, smells)
由 Okeribok 完成的
You can add some ferrite beads to the wiring. May not fix it, but it should help prevent interference.
由 Jessica Parnelli Fawkes 完成的