Casio CZ/ VZ/ FZ - Pro Series

Hello, I purchased cz-101. I`m very happy with it, as it works and sounds amazing. But 6 keys do not working, I thought it may be because of dust. But I cleaned it, and keys still not working. Also I mentioned it is F, B keys on 2,3,4 octave. Is there an info, maybe it can be a problem with resistors or chips (as capacitors looks fine)? Of course I can manually check them, but there are a so much components inside.

BTW It seems there is a place for tablet lith batter on motherboard, but  it is empty, shouldnt be there a battery?

Can't tell you about keys - but yes there should be a CR2032 or similar as backup.

--- On Sat, 12/1/13, misha.aaaaaaaaaaaaaaaaa <b.mlaster@...> wrote:

From: misha.aaaaaaaaaaaaaaaaa <b.mlaster@...>
Subject: [CZsynth] CZ 101 keys repair
To: CZsynth@yahoogroups.com
Date: Saturday, 12 January, 2013, 20:50
















 



  


    
      
      
      Hello, I purchased cz-101. I`m very happy with it, as it works and sounds amazing. But 6 keys do not working, I thought it may be because of dust. But I cleaned it, and keys still not working. Also I mentioned it is F, B keys on 2,3,4 octave. Is there an info, maybe it can be a problem with resistors or chips (as capacitors looks fine)? Of course I can manually check them, but there are a so much components inside.



BTW It seems there is a place for tablet lith batter on motherboard, but  it is empty, shouldnt be there a battery?





    
     

    
    






  










[Non-text portions of this message have been removed]

Keyboard matrix in synthesizers usually uses diodes.

But this looks like a problem with K16 line which brings signal from F  
and B keys. Cable? Connector? Check and clean.

Or some following component? Check Tri State Buffer 74HC241.

Daniel Forro

On 13 Jan, 2013, at 5:50 AM, misha.aaaaaaaaaaaaaaaaa wrote:

> Hello, I purchased cz-101. I`m very happy with it, as it works and  
> sounds amazing. But 6 keys do not working, I thought it may be  
> because of dust. But I cleaned it, and keys still not working. Also  
> I mentioned it is F, B keys on 2,3,4 octave. Is there an info, maybe  
> it can be a problem with resistors or chips (as capacitors looks  
> fine)? Of course I can manually check them, but there are a so much  
> components inside.
>
> BTW It seems there is a place for tablet lith batter on motherboard,  
> but  it is empty, shouldnt be there a battery?

You could also connect the cz via midi to a computer sequencer or another
known working midi keyboard. If the non working keys on the cz still don't
produce sound, it's an internal electronic/ chip issue. If they do work,
then it's the keys/ triggers themselves or the connection to the circuit
that's at fault. Worth doing this just to identify which area the problem
lies.




On 25 January 2013 14:32, Daniel Forr� <dan.for@...> wrote:

> **
>
>
> Keyboard matrix in synthesizers usually uses diodes.
>
> But this looks like a problem with K16 line which brings signal from F
> and B keys. Cable? Connector? Check and clean.
>
> Or some following component? Check Tri State Buffer 74HC241.
>
> Daniel Forro
>
>
> On 13 Jan, 2013, at 5:50 AM, misha.aaaaaaaaaaaaaaaaa wrote:
>
> > Hello, I purchased cz-101. I`m very happy with it, as it works and
> > sounds amazing. But 6 keys do not working, I thought it may be
> > because of dust. But I cleaned it, and keys still not working. Also
> > I mentioned it is F, B keys on 2,3,4 octave. Is there an info, maybe
> > it can be a problem with resistors or chips (as capacitors looks
> > fine)? Of course I can manually check them, but there are a so much
> > components inside.
> >
> > BTW It seems there is a place for tablet lith batter on motherboard,
> > but it is empty, shouldnt be there a battery?
>
>  
>


[Non-text portions of this message have been removed]

Thanks all. Im moving now, will check it later, and let you know.
It totally works from midi, will check lines.