[sdiy] Kurzweil K2000 Query *clarification*

[Dave Kendall]

should have said "A dicky key or tactile switch"

Also it was a connector on the PC board that mated with the battery 
connector that was actually at fault...... the pins there were 
corroded..


On Jun 26, 2009, at 06:30, Dave Kendall wrote:

> *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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