[sdiy] Kurzweil K2000 Query

[Dave Kendall]

*Definitely* change the batteries.

In my K2000RS, a corroded battery contact once caused all sorts of 
problems. Boot-up sometimes, well, er.... didn't- The LCD illuminated, 
but as blank...
K2000s are well built on the whole, but a dicky key or membrane switch 
can cause big problems during the boot cycle.

There is a tactile switch PCB inside the machine (in the keyboard 
version, you have to take both main PCBS and a bunch of other stuff out 
to get to it).
I swapped this for one from a newer machine, to give my main gigging 
K2000 a longer life, and in the other machine, the older board stopped 
working for the ENTER and MIDI buttons. Then, about a month afterwards, 
they started working again, and are still working fine, months later. 
Hmmm....  stuck or misaligned during the swap?

My *guess* is that the K2 scans all buttons, keys and connected 
footswitches (I know the latter is true) on boot up, so any funnies 
will cause problems.

This *might* have a bearing on it's behaviour. Myself and the guys on 
the sonikmatter forum were both surprised that corroded battery 
contacts could cause LCD malfunction, but they were cleaned, and the 
problem disappeared, and has stayed gone....


hope this helps,

Cheers,
Dave
(loves the K2000:-)



On Jun 26, 2009, at 03:55, DTK wrote:

> I'm taking a look at a K2000 for a friend.  It's exhibiting a strange
> problem... at least, I think it's a problem.  If I hadn't been there 
> when it
> happened, I might have thought it was nothing.
>
> We were playing, and suddenly the K2000 lost volume...  It wasn't a 
> dramatic
> loss, the patch was still audible, but there was *definitely* a loss in
> volume.  The patch wasn't changed or edited, mixer settings weren't 
> changed,
> etc.  It just got quieter all of a sudden.
>
> At first we thought it might be some sort of mechanical failure in the
> output jack... A solder joint on the way out, or a worn out center
> connection.  However, that doesn't seem to be the case.  The problem
> persists on the L, R, and Headphone jacks, and on different patches as 
> well.
>
> I'm a bit puzzled by this one, frankly.  There's no difference in the 
> audio
> quality, which leads me to think that the output circuitry is ok.  
> Anyone
> have any thoughts?  Suggestions?
>
> As a side note, the battery in this K2000 is DEAD... 0.0v according to 
> the
> warning when we power it up.  I don't think that would have anything 
> to do
> with the problem, but please correct me if I'm wrong!
>
> Thanks for any insights you may have...
>
> DTK
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