The Kawai & Teisco Analog Synths Group

Just a follow-up: I opened the synthesizer and removed the original battery. I am going to add a Lithiium battery soon but I figured for now I will play it without saving presets.  When I turned it back on, the same two notes were stuck (the lowest G and A only, not the G sharp.) I'm wondering if these two notes could be stuck because of damage from the battery. I didn't see any visible damage on the PCB and the battery does not look like it has exploded, but the proximity of these two keys to the battery makes me wonder if that is possibly the reason.

Any thoughts? When I turn the synth on, the two notes (G and A) are stuck. When I play around and program the synth for a bit, they are silenced, after which point the G and A keys don't make any sound when I press them. So, the keys are dead but the G and A notes hang at startup.

Could it be open traces on the PCB?

--- In kawai-teisco@yahoogroups.com, "jimmyb00ts" <jimmyb00ts@...> wrote:
>
> Thanks so much for your info, greatly appreciated! I am thinking about opening the synth tonight and clipping the old battery out, since I can use it without a battery and since the stock battery is a ticking time bomb. Then later on in the week, I will install a new lithium battery (CR2032.) 
> 
> When I open the synth tonight, is there anything I should be aware of? The service manual does not provide instructions for opening the synth and I know from my Opus III and Prodigy that great care must be taken when opening one of these beasts.
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> Also, do you know the type of CR2032 I should get? 
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> I am considering using this battery holder:http://www.radioshack.com/product/index.jsp?productId=3060977
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> And this battery: Enercell® 3V/225mAh CR2032 Lithium Coin Cell Battery. Is that a good battery to use? I also have already found the necessary diodes.
> 
> Thanks so much for your assistance, it is greatly appreciated!
> 
> All the best,
> JB
> 
> --- In kawai-teisco@yahoogroups.com, "kb_cheapmods" <kerrybradley@> wrote:
> >
> > Mine had similar problems when I got it.  
> > 
> > It still had the old battery so I clipped that out first.  Then inspection around the battery area revealed darkened discolored PCB traces.  I took my ohmmeter and did continuity checking on them.  I found that, while the traces didn't LOOK open, some of them actually were.  I found two that were open, so I used jumper wires to bypass those open traces.  That fixed the synth.
> > 
> > I then replaced the old battery with a CR2032 holder and diode in series so that I could reload and have saved patches.  It's a really nice sounding synth!!!
> > 
> > 
> > So, first remove that battery, then see if there are damaged traces, then repair those.  Good luck!
> > 
> > --- In kawai-teisco@yahoogroups.com, "jimmyb00ts" <jimmyb00ts@> wrote:
> > >
> > > So, the first thing I should do is remove the NiCad battery, right? Do you think the stuck notes could be a symptom of the circuit board being damaged?
> > > 
> > > Thanks for your help.
> > > 
> > > - JB
> > > 
> > > --- In kawai-teisco@yahoogroups.com, "siwanyzki" <staniwan@> wrote:
> > > >
> > > > I use my all the time with no battery.  I have all the settings for my presets written down.  All the memory locations default to the "Basic SX240" settings.   You can replace the nicad battery with a standard CR2032 Lithium battery with a diode in place so the lithium battery does not receive a charge from the synth charging circuit.  The battery would explode without a diode in place.
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> > > > --- In kawai-teisco@yahoogroups.com, "jimmyb00ts" <jimmyb00ts@> wrote:
> > > > >
> > > > > Hello all, I searched the archives so apologies if these subjects have been definitively responded to.
> > > > > 
> > > > > Can I use this synth without a battery (in other words, if I desolder the internal original NiCAD battery, will the synth work as normal, save for the inability to save presets?)
> > > > > 
> > > > > My SX-240, which I just received, is in near-mint condition cosmetically; however when I turn it on, four consecutive notes in the lower half of the keyboard are constantly droning. Does this mean I have circuit board damage from a leaking battery, or just that said battery is dead? 
> > > > > 
> > > > > Where can I find a replacement LI-ION battery as opposed to a NiCAD (I found links in previous posts to NiCAD batteries but I don't want to deal with a hazardous battery once again in 2024!)
> > > > > 
> > > > > Finally, how many of these synths were produced? I have read estimates including 1000 and 3000 total. Has anyone got the definitive number or something close?
> > > > > 
> > > > > Thanks for your patience and time!
> > > > > 
> > > > > - JB
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