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Why does my DP change notes on its own?
#3012298 08/10/20 01:55 PM
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Greetings All,

My Kurzweil Grand Ensemble Mark IV changes notes on its own. It is more prominent the longer it is on. I was wondering if this is just bad electronics or could it be dust. If it is dust, would it make sense to tear it open and use an air duster?

On another note, I need a key return spring. The spring has a long straight followed by coils. Any idea where to get one?

TIYA,

Cheers

Re: Why does my DP change notes on its own?
egarner01 #3012303 08/10/20 02:29 PM
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Hi, welcome.

What do you mean exactly by "changes notes"?

Re: Why does my DP change notes on its own?
U3piano #3012311 08/10/20 02:42 PM
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Hi U3piano,

While I am playing a line or a chord the pitch changes. It does not matter if I am playing soft or loudly. It does not matter which keys are struck. The volume may or may not change.

Thanks for the question.

Edward

Re: Why does my DP change notes on its own?
egarner01 #3012322 08/10/20 03:07 PM
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Hm, that seems quite strange.

I take it the guarantee period is finished? Have you thought about contacting Kurzweil anyway? Maybe they could give some advise?

Opening it up and carefully vacuuming the inside would be the first thing i'd think about as well, but other than that I have no idea.

Are there buttons for pitch changing on the board? If so maybe they are making contact while they shouldn't? Or a pitch bend wheel going crazy living it's own life maybe?

Re: Why does my DP change notes on its own?
U3piano #3012325 08/10/20 03:19 PM
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Originally Posted by U3piano
Hm, that seems quite strange.

I take it the guarantee period is finished? Have you thought about contacting Kurzweil anyway? Maybe they could give some advise?

Opening it up and carefully vacuuming the inside would be the first thing i'd think about as well, but other than that I have no idea.

Are there buttons for pitch changing on the board? If so maybe they are making contact while they shouldn't? Or a pitch bend wheel going crazy living it's own life maybe?

No buttons for pitch change. Bend wheel was barely touched in the last twenty years (Kurzweil is no help). I think it might be ghosts.
B/c of your post I will sign up for their community support. Thanks for the response.

Cheers, Edward

Last edited by egarner01; 08/10/20 03:24 PM.
Re: Why does my DP change notes on its own?
egarner01 #3012326 08/10/20 03:24 PM
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Originally Posted by egarner01
No buttons for pitch change. Bend wheel was barely touched in the last twenty years. I think it might be ghosts. Thanks for the response.

So the pitch bend wheel works fine when you try it? (I don't know anything about electronics but I could imagine a disfunctional part of the pitch bend wheel controller could cause an effect like this, even without having used it, maybe caused by moisture, who knows.)

I could imagine these ghosts make for some creative playing. crazy

Re: Why does my DP change notes on its own?
U3piano #3012339 08/10/20 03:45 PM
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Originally Posted by U3piano
Originally Posted by egarner01
No buttons for pitch change. Bend wheel was barely touched in the last twenty years. I think it might be ghosts. Thanks for the response.

So the pitch bend wheel works fine when you try it? (I don't know anything about electronics but I could imagine a disfunctional part of the pitch bend wheel controller could cause an effect like this, even without having used it, maybe caused by moisture, who knows.)

I could imagine these ghosts make for some creative playing. crazy

Pitch bend wheel works just fine. But as far as ghosts not Mozart, but maybe Mahler?

Thanks

Last edited by egarner01; 08/10/20 03:46 PM.
Re: Why does my DP change notes on its own?
egarner01 #3012409 08/10/20 06:12 PM
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To be precise, there are two separate requirements that the pitch wheel and circuitry should meet.

1. Bend the pitch commensurate with the smount of movement when the pitxh wheel is adjusted.

2. Do not bend the pitch when the pitch wheel is left in its resting state.

Are you sure its behavior is meeting requirement 2?


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Re: Why does my DP change notes on its own?
Sweelinck #3012414 08/10/20 06:20 PM
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Originally Posted by Sweelinck
To be precise, there are two separate requirements that the pitch wheel and circuitry should meet.

1. Bend the pitch commensurate with the smount of movement when the pitxh wheel is adjusted.

2. Do not bend the pitch when the pitch wheel is left in its resting state.

Are you sure its behavior is meeting requirement 2?

Hmmm interesting. How would I be able to check that? The wheel does not move.

???

Re: Why does my DP change notes on its own?
egarner01 #3012417 08/10/20 06:31 PM
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Originally Posted by egarner01
The wheel does not move.

Allright, that means we can scratch ghosts off the list of possible causes, I think we're getting somewhere.

Re: Why does my DP change notes on its own?
egarner01 #3012424 08/10/20 07:07 PM
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Originally Posted by egarner01
Originally Posted by Sweelinck
To be precise, there are two separate requirements that the pitch wheel and circuitry should meet.

1. Bend the pitch commensurate with the smount of movement when the pitxh wheel is adjusted.

2. Do not bend the pitch when the pitch wheel is left in its resting state.

Are you sure its behavior is meeting requirement 2?

Hmmm interesting. How would I be able to check that? The wheel does not move.

???

Well, it would be a job for an electronics technician to fully debug, but there are a couple of things you can do.

1. Page 15 of the manual describes the pitch bend range parameter. You could try setting this to zero and turning off pitch bend. If this fixes the problem, maybe you are done dealing with it, and can just use the piano without the pitch bend feature.

2. If you want a working pitch bend, you could open the case and see if the pitch bend wheel and its spring are mounted correctly. If not, the spring may be exerting force on the mechanism causing pitch bends at more or less random times.


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Re: Why does my DP change notes on its own?
egarner01 #3012445 08/10/20 08:03 PM
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Originally Posted by egarner01
Originally Posted by Sweelinck
To be precise, there are two separate requirements that the pitch wheel and circuitry should meet.

1. Bend the pitch commensurate with the smount of movement when the pitxh wheel is adjusted.

2. Do not bend the pitch when the pitch wheel is left in its resting state.

Are you sure its behavior is meeting requirement 2?

Hmmm interesting. How would I be able to check that? The wheel does not move.

???
I think one way to monitor this would be to hook the keyboard up with midi out to a computer or phone. You can get free software to monitor the midi. You should see a command logged when the key changes pitch; which command it is might give you a clue. . . .

Re: Why does my DP change notes on its own?
hes #3012460 08/10/20 09:02 PM
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I'm sorry I did'n t mean the wheel does not move at all, just that the wheel does not move when the problem occurs. But I see your point as far as measuring its proper operation. Thanks for the tip. I will do that in the upcoming week.

Cheers.


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