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Yamaha B5CR organ... 3 notes in each octave are not sounding

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Open up the top cover and check the tone generators (12 little black "barrels"). There are 12 generators in total, one for each note in all octaves. Try to adjust trimpots on the generators.

Posted on Jun 10, 2008

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Posted on Jan 02, 2017

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Yamaha YPT 400: ALL re are not working


Hi, If by "re" not working you mean note D then try the following.
Keyboard off, hold down top C key while turning on. This factory resets. Does D key now work - if not. Has it ever worked - if not then it could possibly be the ribbon connector between the keyboard and the motherboard. If one of the cables gets bent then this would stop all notes associated with that connection to stop working. This will only have occured if the keyboard has never played these notes or if it has been taken apart.

You could also try the self test mode : Keyboard off, hold C#,F, G# in the 2nd octave up whilst turning on, cycle through tests to sound if it plays all the notes one at a time then the sound chip is ok and it points to keyboard switching. If test mode does not come up in 2nd octave try 3rd octave ( cant remember which one it is from memory )

Let me know how you get on.

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yamaha-ypt-400-all-re-not-working#solution-section-o0etyz1v3mt3zyequ52mc4su-5-2_0.jpg

Feb 07, 2016 | Yamaha YPT-320 Keyboard

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When I hold in C and then press Csharp in the same octave,the C-sharp goes silent.It goes the other way around as well.They work when I tap them separately.And that problem occurs in every octave of the...


It sounds like the piano is in mono setting. One note at a time can be played. Find out how to set it at poly mode, allowing multiple notes to be played at the same time.

Jul 09, 2014 | Yamaha P-155 Electronic Piano

1 Answer

Playing certain 3 or 4 notes at a time causing sound of one or more extra notes.is there a quick fix?


Have a professional tune it for you. It may be that some strings have loosened/tightened.

Sep 06, 2012 | Yamaha P95 Digital Piano

1 Answer

Hello, I have a Yamaha P90. 4 keys are not responding. all others are ok and give sound. What happened ?


If they are the same note- different octave- it may be a bad solder joint near the main oscillator IC.

If they are the same cluster (adjacent white keys or adjacent black keys) in the octave, it may be a faulty wire connection.

Apr 01, 2012 | Yamaha P90 Digital Piano

1 Answer

When I play my Bass Clarinet, the bottom joint won't play the higher octave. It will play everything except the 3rd octave B-E. I can't find any leaks.


usually If a certain note doesnot play the note before it is not seating correctly. Check all pads that they are sealing behind the bad notes, also make sure the octive key is sealing.

Feb 11, 2011 | Yamaha 5C Standard Bb Bass Clarinet...

1 Answer

Yamaha Electronic Piano- certain notes malfunctioning


Either the first or second closure matrix line for the "A" keys is bad.

This may be a cracked or shorted circuit board.

A bank of diodes is used to prevent sneak electrical path if more than one octave has notes pressed.

First thing is to clean ALL the key contact areas and the conductive rubber pills with 99% isoprophyl alcohol.

This involves dis-assembly of the key area. If you are not competent in electronics, best left to a pro shop.

The keys are scanned in a matrix, two contacts per key and all the individual notes are in common (all the "A;s", "B's"...) And each octave is strobed for the first set of contacts and then for the second set of contacts. an the whole octave is read in parallel.

The reason for two contacts is one closes first and then the other as a key is lowered. The time between these is measured and is the note VELOCITY which for a piano controls the loadness of the note. IF ONE of the two fail, the loudness will vary as yours does.

Nov 24, 2009 | Yamaha NP 30 76 Key Lightweight Digital...

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Looking for a schematic of the Casio ctk-700 to


The keyboard is LIKELY scanned as a matrix.

You have two problems:

The contacts in the Thomas will have to be totally disconnected rendering use of any of the Thomas organ unlikely.

The second problem is that the keyboard LIKELY has velocity sensing. This means TWO contacts must be used PER note. One contact "makes" first and "breaks" last. This is used for velocity sensing on synths. The Thomas foot pedals likely only have a single contact per pedal, and even if they had two, it is unlikely they sequentially close..

The matrix scanning is accomplished by sensing the connection of two crossing points on a matrix of circuit lines. USUALLY each of 12 wires tie to all of one note across the board. Then two other lines for each octave "strobe" the first make contact and then the second of those strobes the second make contact. There are two of these strobe lines for EACH octave on the board.

Remember that these lines scan at digital logic speeds so wire length and NOISE/STAIC DISCHGARGE PROTECTION is a must.

Aug 22, 2009 | Casio Music

1 Answer

Wurlitzer organ, highest key plays note one octave too low.


If this is the kind of organ with the wire sticking out of the key that makes contact with the bus bar to create the note you will have to make sure that key is operating the same as adjacent keys. The busbars have to be clean and the contact wires have to be clean. Sometimes when cleaning the wires they will spring out of place and not make contact with the appropriate bus bars. Check that key against the rest and see what you find. Hope this helps.

May 17, 2009 | Music

1 Answer

Yamaha clavinova won't play C natural in any octave


Hi ...
There are flexible cables that connect the keys to the main electronics. The connectors for those cables sometimes age poorly..
It is fixable. But dont "get taken" on a repair.
If it's just resoldering a few points,it shouldnt be more than $100.00
to fix

Jan 04, 2009 | Yamaha Full-Size Keyboard

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