Fixed Yamaha P85 no sound

by Dave
(Canada)

My P85 had no sound so I used the service manual to replace a part on the circuit board. C122 was at fault. The service manual has schematics and the pcb is well marked. I have an electronics background and know how to solder.

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Jan 03, 2022
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Same fix worked for me NEW
by: Pumpstein

Based on comments here, I tested C216 & C217 with a resistance meter and capacitance meter. One was shorted the other measured ~80 mf (should be 100 mf). I replaced both of them and tested nothing else on the PCB.

Put it all back together, hit the power switch, hit a key and what do you know - it worked. Sounds great!

Dec 09, 2021
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How did you figure out which capacitor to replace?
by: Rob

For those of you that fixed successfully, how did you figure out which capacitor to replace? Just start pulling and testing them all one by one? Thanks!

Oct 06, 2021
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216 & 217 fixed mine too. NEW
by: David

Thanks for posting this fix!!! 216 and 217 fixed it for me too. I could not afford to replace my P-85 nor a repair bill. For others like me who can solder but know little about electronic components, pay attention to the orientation of the side with stripes on the capacitors when soldering in the new ones. $6 spent on on 100uf 16v capacitors on Amazon and I have a working piano again. Huzzah!

P.S. Found the Repair Manual here:

https://www.manualslib.com/manual/957003/Yamaha-P-85.html

which aided in locating the capacitors on the circuit board.

Jun 22, 2021
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Replaced C216 and TR201
by: Irwingstone Howard

For my child's keyboard, C216 was shorting and along with TR201 had to be replaced. This did the trick.

Apr 09, 2020
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216 and 217 were the culprits on mine, too
by: Anonymous

216 and 217 fixed it for me.

Dec 20, 2019
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Problem Resolved
by: Anonymous

Thanks all for the information provided in this thread. My p85 had the same problem and I replaced c216 and c217 and problem solved!

Dec 20, 2019
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fixed
by: Magic

In my case replacement of C216, 217 didn't help.
It was C408.
I have checked all capacitors on AM circut board by using multimetr and C408 had a "Beeep"
I found replacement part in old dvd.
Fixed
Thanks to all for engagement in topic.

Sep 10, 2019
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How to fix it?
by: Anonymous

there is no sound on my p-85 either, i turn it on and press keys but there is no sound. it is no the power because ive switched outlets and the red light stays on, the keys just have no sound. the volume is on.

Aug 21, 2019
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p85 no sound / no power?
by: ctijn

Our P85 also makes no sound. When pressing the Standby/On button, the red LED turns on for a few seconds (some days just 1 second, some days a bit longer). Then there is a clicking sound coming from one of the electronic components (not the speakers, it sounds more like a relay, perhaps an automatic fuse?). Then the red LED turns off and it seems that there is no power on the system anywhere.


- I opened the unit to look for water damage or other short circuit causes but didn't find any.

- The power adapter gives a voltage of about 17V (when not connected to the P85)

- a few days ago with the unit open, I connected all cables and had power (red LED on) for about 20 seconds, during this time all piano keys worked and produced sound, the voice buttons and 'demo/song' button did not work. then I tried again and it was back to the problem described above: only a few seconds of red LED on)

Would you have any idea how to diagnose and repair?

Thank you!

Feb 02, 2019
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Yamaha P85 no sound fix
by: Anonymous

My Yamaha P85 had a no sound problem too. I replaced the two 100uf capacitors at locations C216 and C217 on the board where the DC power plug connects. Fixed it right up.

Jan 21, 2019
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How did you find the problem sourse
by: Anonymous

i been looking at the circuit but i cant find the problem source

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