SUCCESS STORIES: Yamaha Keyboard P-95 sound problem (speakers & headphones)

FlorianK

Joined Dec 17, 2020
1
Thanks for sharing this. My wife's P95 had the same problem after being stored away for a few years. Switching C216 and C217 solved the issue!
 

waltergrund

Joined Dec 14, 2020
1
Hello everyone,

I have a Yamaha P-95 that after approximately one year of being stored, currently is not emmiting any sound from either speakers or headphone plugs.

I checked the functionality of the Keyboard and the MIDI processing was ok. I tried all the quick solutions out there (enabling internal audio, check if something is blocking the headphone plugs, cleaned volume key), I figured it had to be the amp board so I decided to open it and see if there was a component with blackened leads, or some visual clue of the problem, but unluckily the problem wasn't so evident and there were no faulty components to be seen.

Looking for schematics I came across a post in this forum that stated a similar problem:
https://forum.allaboutcircuits.com/threads/speaker-relay-on-yamaha-r-90-receiver-not-closing.77234/
In wich it states that the keyboard has a protection circuitry that closes the speaker feed relay if after a few seconds from turning on the output stage is found healthy. This is indeed the case as I can hear the relay closing, and even opening again each time I connect headphones on either plug.

The strange part is that, trying to troubleshoot the situation, I unplugged the headphones board and after reconnecting it, the problem went away... unitl I turned the keyboard off and on.

Sadly the service manual has no schematics of any board. It only shows the disassembly of the unit.

Any thoughts on what may be the problem?

Thanks for reading,
German.
Hey,
just bought a P95 with the very same Diagnosis. No sound, but Midi was working. I exchanged C216 + C217 then checked them with my Multimeter, they had been okay. Then exchanged C112 also. Bam! This one was broken. You couldn't see it from the outside. P95 working fine again. Thanks a lot!!!
Walt
 
Hey,
just bought a P95 with the very same Diagnosis. No sound, but Midi was working. I exchanged C216 + C217 then checked them with my Multimeter, they had been okay. Then exchanged C112 also. Bam! This one was broken. You couldn't see it from the outside. P95 working fine again. Thanks a lot!!!
Walt
This fixed it so awesome
 

MisterBill2

Joined Jan 23, 2018
9,793
This thread is very educational indeed! Now I am wondering about the brand of those capacitors, C212, 216, and 217, that are havingto be replaced, and the date-code on them, if there is any date code. I seldom work on keyboards, BUt the same brand of caps is probably used in other sorts of electronic stuff as well. Knowing who are the likely suspects would be useful is my reason for asking.
 

flugwolle

Joined Feb 4, 2021
1
Hello,
I had the same problem, no sound.

All capacitors on the AM board changed. Now it works again. When the capacitors were subsequently measured, only capacitor C113, 33µF turned out to be defective.
Thank you for the valuable tips.

Wolfgang
 
I had a somewhat larger electrolytic in my junk box (50V, 150 microfarads). I found the bad capacitor by using my voltmeter, and found that one of them, C217, was shorted out. I replaced C217 with the junkbox capacitor and voila, the keyboard started working.
 
Hey,
I also bought a P95 with that issue. All capacitors was fine except of the cracked one C112 wich was shortened. After changing that one the P95 works fine again. Thanks for the informations that I got here to get the courage to buy and repair a P-95!

BR from Germany
Julian
 

etran44

Joined May 5, 2021
1
Hello AAC members !

I 'd like to thank you for all these advices and feedbacks :

I had the same issue with a P95.

As a newbie with electronics soldering, I bought a starter kit and a couple capacitors, then replaced C216 . I damaged the printed circuit when removing C217 so didn't replace this one :)

I replaced C408 just in case also, and the piano works, except the left speaker maybe that C2
17 left over , but its all right , as I already thought my piano was dead !

Thanks again to the community

Best regards.

Eric
 

dl324

Joined Mar 30, 2015
13,505
Welcome to AAC!
As a newbie with electronics soldering, I bought a starter kit and a couple capacitors, then replaced C216 . I damaged the printed circuit when removing C217 so didn't replace this one
The normal failure mode for electrolytic caps is open (an initial short may cause the open circuit condition), you can tack a good cap across the terminals of the suspect one (observing correct polarity). If that fixes the problem, then it needs to be replaced.

Troubleshooting a single bad cap is straightforward. If you have multiple bad caps, it will be more difficult to isolate the bad ones. Start by looking for bulging caps.
 

Defalt

Joined May 22, 2021
1
Hello, I have been in this forum for several days, the problem I have is that the volume of my P95 is extremely low and only one of the speakers sounds
 

Dedo

Joined Jul 23, 2021
1
Same problem with Yamaha P95, (2012 production) no sound from speakers or headphones ( only led lights are on and operational ) after changing C216 cap P95 is working again the only problem I have now is when I press on- off on the keyboard it will cut the sound off from the speakers or headphones led power light is on no sounds at that point only power light is there (does not go off) when I unplug power supply and plug back on it works again sound is back keyboard is working to shut it off I need to shut it off from the keyboard or from the wall and than again plug it to the wall - keyboard on off is like not there will no do a thing .Could someone be helpful with that. Thank You very much.

Hi JURECKI,
I have the same problem. Did you solve this? Or you change the AM or the DM board.
Thanks! :)

Juan
 
Hi JURECKI,
I have the same problem. Did you solve this? Or you change the AM or the DM board.
Thanks! :)

Juan
But we hear that it cuts off the sound, and so the switch and it's wires must be OK. Does that same on/off switch turn it on when you want it to? Or do you have to unplug and then replug before it works?
Here is a guess, which is that afterrelacing the failed capacitor, some connection is not in the right place. But having never seen the P95 I am not able to point at the exact cause.
 
Top