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Electronic piano, yamaha pf80, bought new 1985-6. Push in the power switch to turn on, and the piano works fine. After about 2 or 3 minutes, it cuts out - as if it had been unplugged. Cycle the power switch (push in to turn off, and in again to turn back on), and again it plays as normal, but then it cuts out again, after maybe 30 seconds. The nearest Yamaha repair shop is 40 miles away, and they want a $60 bench fee just to look at it. I can't risk that much (time, effort & money) just to find out it's not worth fixing. Perhaps the power supply unit (built in, not the cord-adapter-plug type) has gone bad. Is there a way I could determine that at home? I'm no electronics wizard, but if I knew it was the PSU and could find the part, I'd try to replace it myself.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 395 Answers

SOURCE: Will only power-on after multiple atempts.

That problem is well known problem with a memory capacitor on the stand up board that is the control board. It is .47F 5.5 volt capacitor that resembles a button battery. The cap leaks all over this board the fluid is conductive and corrosive. So the cap must be removed and the board scrubed clean with contact cleaned and dried before replacing with new cap. the unit can run without this cap but if the power should be removed all customer settings will revert to the default. also check the copper ground screws for tieghtness.

Posted on Jul 08, 2007

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dthomas1969
  • 4 Answers

SOURCE: Yamaha RX-V757 No Left Channel Output - Video Sources Only

First - make sure it is not a defective cable by reversing the leads/colors on the inputs if problem then goes to the right channel then you know it is a bad cable/RCA, etc., connector. I would try that first.

Thanks,

dthomas

Posted on Feb 07, 2009

SOURCE: Yamaha HTR-5760 goes to standby 2 seconds after power on

Maybe your device got the audio amplifier IC damaged

Posted on Jul 02, 2009

dunnbiker
  • 8546 Answers

SOURCE: Yamaha Amp RX-V1700B Receiver - no power to head unit

Go to the shop.

Posted on May 28, 2010

Testimonial: "Thanks - I came to the same conclusion myself - hopefully something simple and not too expensive."

dunnbiker
  • 8546 Answers

SOURCE: Hey got a yamaha rxv650

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Eure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Posted on Mar 01, 2011

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