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Yamaha P-115 digital piano features Graded Hammer Standard keyboard, which is responsible for high-quality and realistic imitation of real acoustic piano’s keyboard.

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Keys Suddenly Not Sounding

Hi. The Db and G keys in the upper octaves (6 and 7) of my P115 are suddenly not sounding. Any ideas how to fix them?

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Hi @susel61 ,

Looking at the wiring diagram in the service manual for the keyboard, (Be patient, it takes a little while to go from “processing” to “Download” once you have passed the reCAPTCHA test and click on Go to Download)

I suspect that there is either a loose cable connector between the circuit board that connects those notes to the next circuit board in the keyboard or a dry joint wire on the cable connector itself at either end of the cable.

Here’s a composite image taken from the manual where I’ve shown that the board where the keys are connected to, are connected to the next board and then so on to the processor.

I’ve highlighted that all the affected keys use the same two wires to signal the processor and also where the cable connects between the two boards.

Given that there is no other problem in those octaves then the connector must be plugged in OK BUT one of the wires (N11) is at the very end of the connector so the connector may not be pushed in far enough just at that end.

If it is plugged in far enough then either n11 or n21 is faulty where it leaves the GHL88H board or where it enters the GHL88M board as after that everything is working.

Block Image

(click on image to enlarge for better viewing)

I’m not a musician but it appears as far as the circuit numbering for the keyboard keys are concerned, the octave numbering starts at 0 that is why I’ve highlight C#5 (D flat), G5, C#6 (D flat) and G6 because they are actually C#6, G6 , C#7 and G7 as far as the keys are concerned

Sorry to be so technical but it’s looking like a wiring problem.

The service manual details how to access the boards so that the connectors and the wiring can be inspected and tested.

If this seems too daunting to tackle yourself, contact a reputable electronics repair service (piano repairs?) and ask for a quote. You could mention that the service manual is available online as that may help them if they are not that familiar with the keyboard

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Thanks, @jayeff! I came across another thread where many people were having the same problem, and the advice was to give the back of the keyboard a couple of hard slaps (I’m not kidding). Seems it worked for others, so I gave it a try. And viola! It worked. :)

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Thank you for your detailed response! My keyboard has the same issue, though with some D keys and some Ab keys, both high and low pitches. The problem started out intermittent, and then became worse, so a bad solder sounds likely - I hope! I can fix that! I'm comfortable with electronics, so I'll be cracking it open with the help of the service manual. I'll try to remember to post how it goes.

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Thanks @jayeff ! Same exact issue here too. What I don’t understand is WHAT has to be done… I’m not an electronic guy, will it need soldering? I can do some cleaning, and definitely check the contacts… will I need some sort of multimeter to check if it’s conducting or not?

Thanks so much,

David

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@David Cantoni

First check that all the cables as securely plugged into their respective connectors on the keyboard key "boards" and on the main control board that they go back to (usually there is only one cable back to the control board.

Even unplugging them and reconnecting them may help as it might reseat the connector and also cleans the contacts at the same time.

Do this with the power disconnected.

If it still doesn't work then you will have to get technical with a digital multimeter to locate where and what the problem is.

The way these keyboards seem to work is that voltages are supplied to the keys and when they're operated this is passed back to the CPU which then knows what output is required to be produced to be sent to the speakers i.e. the required music notes.

If these voltages aren't either getting to the keys or getting back to the CPU there will be no output. If all the notes were affected it would be back at the CPU end or perhaps a power problem. If only some of the notes are affected then it is a power supply for those notes only or a wiring problem for those notes.

It seems that two different notes share the same two wires (this is to limit the number of wires necessary) so that is why sometimes only two notes in every octave are affected. If it is two notes then it won't be a key contact problem.

What notes are you having problems with and what is the make and model number of the keyboard?

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Gave some hard slaps to the back of the keyboard, worked for me!!

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