Yamaha s90 out of tune

by Jim T
(Latham NY USA)

Our Yamaha S90 keyboard randomly goes out of tune...even if it is at A=440? Why? and What is the solution? Thanks.

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Sep 13, 2015
S90xs out of tune
by: Anonymous

Our s90xs at church is doing the same , going out of tune randomly and more frequently. Has anyone come up with a solution? Could it be a power problem?

May 12, 2013
same problems... out of tune.
by: Dallas From Texas

I have the same trouble on our S90es at the church that I work at. As has been stated, the power cycling works, but it is happening once or twice a day now. any ideas on how to fix this or what is causing it?

and to those who are saying this is a digital instrument it DOES NOT go out of tune, you are incorrect. it is happening on a consistent basis. whether or not it is a digital issue or whatever i assume so... please advise. thanx all.

-- dallas stevens, III
-- Lubbock, TX

Dec 19, 2012
me too
by: JRTaylorMusic

I have an S90es and it goes out of tune. It was only happening once every few weeks. Cycling the power fixes it, but now it is going out of tune within a set (about 10 cents flat) so power cycling is not an option, only adjusting the master tune by 10 cents (or so).

Apr 28, 2012
yamaha s90es
by: Julio

I need a new mainboard but I'm in Puerto Rico. Is preferable to throw it to the trash. Mainboard price is around $800. I'm still with the keyboard if something appear thatks god. my email. jul6104@hotmail.com

Dec 27, 2010
Yamaha S90 broken
by: Anonymous

Hello who helps me get a new mainboard for Yamaha S90. In Italy the prices are high. (translated)

Dec 16, 2010
Keyboard out of tune
by: Dick Rector

Hi Jim,

Normally, unless something is broken of course or manually changed, a keyboard can NOT go out of tune as it is digital.

I would try the following resets:
There are two ways to reset your keyboard.

1. Is what I call a mild reset and that deletes everything in the on-board flash-memory that wasn?t saved in user-area?s or on a flash-stick or so.
You can use that anytime and some people (like me) do this reset almost every time I power up my keyboard to make sure it is a ?fresh? start.
-Hold down the most right white key while powering up. This takes only a few seconds.
That?s all!

2. The second method is a different story.
It will bring your keyboard back to the status as it was when it came out of the box (unless something is really broken of course!)
This is a FACTORY reset and you should only perform this if the keyboard is really confused and acting strangely.
-Unplug the power for 10 seconds
Hold down the same most right white key PLUS the nearest 3 black keys while powering up.
Keep in mind!!!!!
This action will delete EVERYTHING that is stored in User-Area?s, like your songs, home made voices, registrations etc. including the owners name (depending on the model). So make BACKUP?S first if still possible if you have some work saved.

You don?t have to worry about all the internal factory-styles and voices etc, these are stored in non-erasable memory and will be still there.

If this is not bringing your keyboard back to life as it should be, you need a qualified (preferable a Yamaha trained) repair-person.

I hope this helps,


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