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Keys don't work in random pattern formation

Counting the keys from left to right, from switch on every third key won't work, run your finger up and down the keyboard and then three keys don't work out of every five, press lots of keys randomly and the left to right pattern is working, not not, working working working, not not, working, not not, working working working, not not, various numerical patterns of keys not working. The three tranistors on a heatsink in the power supply were all dry joints but soldering them didn't help.

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    Keys don't work in random pattern formation

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    posted by djfixit on Dec 02, 2008

    Counting the keys from left to right, from switch on every third key won't work, run your finger up and down the keyboard and then three keys don't work out of every five, press lots of keys randomly and the left to right pattern is working, not not, working working working, not not, working, not not, working working working, not not, various numerical patterns of keys not working. The three tranistors on a heatsink in the power supply were all dry joints but soldering them didn't help.

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  • Roland Master
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The keys are scanned in a matrix. It sounds like two of the matrix lines are broken. They may be broken on the board which the keys contact. These are often conductive rubber "pills" pressed onto finger like patterns of circuit traces. The traces have a black coating in the contact area. If the keys have been "mashed", sometimes the board is cracked. IF the crack goes through one of these contact areas, that is fatal. That board needs to be replaced.
A loose cable where two wires of the matrix aren't contacting would do it as well.

Posted on Jul 29, 2009

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What are all the left side controls on an Elegance JC-618 electronic keyboard


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In Single,by press one key (eg:A) then chords A is heard,and so on.
In Finger,you must press 3 keys.Example: G-B-D,then you heard G chord. D-F#-A is D chord.
In Finger,lets say you press A chord and want to change to C chord by press one key C only,there's nothing change untill you press C-E-G.
Low, is for chords octave low.
Chords Off,no chords can be play,it mean overall full piano mode..
Single,Finger,Low, can be activate with Sync Start button.

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I have three keys getting malfunctioned /cords not changing in left side, on split board.can this be fixed?


If those keys work normally, it's hard to see how the key switches themselves can be bad.
Is your keyboard MIDI capable? If you play the same chords, does the MIDI output look OK?
Could it be that your keyboard simply can't play all of the different sounds at the same time? I know some are limited in how many simultaneous tones can be played.

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The PF-85 action works by having the hammers strike the contact strip, which in turn connects the trace patterns on the circuit boards you're looking at together.

Any dirt between the contact strip and the circuit board will cause the keys to not function correctly. You can remove dirt with rubbing alcohol (iso-propanol) and a cotton swab. The only thing on these boards is traces, contacts, and diodes so they are safe to handle...just don't get finger prints on the contacts.

You should also make sure that the white wires are plugged in all the way on the back of these boards. A loose connection will cause the problem you've described. As would missing screws!

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Since you haven't told us much information, I can only suggest you check the TRANSPOSE settings. These cause the keys to shift left or right INCLUDING the black keys.

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The use of the Transposer control. I am very much a beginner in music in spite of my advanced years, and I have been puzzling over how to use this control. Would I be correct that all I need do is to...


A SIMPLE way of looking at the transposer is that it shifts EVERY key on the keyboard left (+) or right (-) by the number of the transpose. ALL keys, black and white are counted. As far as counting sharps and flats I would NOT depend on that. The transpose would for instance allow you to play a song you knew in "C" and have the sounds moved to a different key. For instance, a transpose of +2 would move EVERY C to "sounding" D, C# to D#, D# to F, E to F#, F to G, F# to G#, G to A, G# to A#, A to B, A# to C, and finally B would sound C# pitch. Given a key like G for a song that has one sharp (F#) to play this by keying it in the key of "C" you would use a transpose of +6 or minus 6. The number of key positions (including black) between the key you want to play in and the key the song is in. For a song in D that is played in C you would use either a +2 transpose or a -10 depending on whether you wanted the higher or lower octave to sound. Looking at it this way I do NOT believe the method you proposed would work... Look at it the way I described and you won't go wrong.

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Are the silent keys random or in a pattern (e.g. a group of adjacent notes, every B and G or just all over the place)?
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1 Answer

Wisdom required


If you can find the C-below-middle-C ?

Put your small finger on C,
your next finger on the next white key: D,
your middle finger on the next white key: E
your index finger on the next white key: F
your thumb on the next white key: G

Lift your fingers away from D and F -- to keep this simple -- all we did was identify the D and E and F and G keys, relative to the C key.

Press C and E and G (small, middle, thumb)
to play a "major" chord in C.

Move your fingers "up":
C to D, E to F-sharp, G to A,
and play a "major" chord in D.

Move your fingers "up":
D to D-sharp, F-sharp to G, and A to A-sharp,
and play the chord in D-sharp (usually called 'E-flat').

Move your fingers "up":
D-sharp to F, G to A, and A-sharp to C,
and play the chord in F.

Move your fingers "up",
F to G, A to B, and C to D,
and play the chord in G.

Go back to the starting position (C-E-G),
and move "down": C to B-flat, E to D, and G to F,
and play the chord in B-flat.

So far, you have C-major, D-major, E-flat-major, F-major, G-major, and B-flat-major.

There are more chords, but most pop-music is in one of these keys.

Give it a try.

A lot of left-hand stuff is just the small-finger and thumb, omitting the middle finger, e.g., C&G,
to avoid a too "muddy" sound.

Or, "stretch" your hand: C-and-G-and-the-next-higher-C.

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1 Answer

Yamaha electronic piano keying circuit broken


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The silicone rubber domes contain a conductive rubber pills, often two of them. One contacts the fingers before the second and the time difference between those is the measure of "velocity".The silicone dome acts as the restoring force for the key.

The keyboard is scanned as a matrix. Strobe lines intermittently select the first and then the second of the finger patterns, ONE octave at a time. The octave, 12 notes worth, are read in parallel one at a time.

The diodes are "disconnect diodes" which preven sneak paths when more than one note is held that are in different octaves.

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