The Kawai & Teisco Analog Synths Group

Just another update. Opened it up and took the battery out, no damage to the PCB that I could see. The lowest G and A keys were sticking when I turned the synth on but I fixed that by taking the keys off and cleaning the rubber contacts.

Now all I need to do is get a new battery and install it. Until then I am writing down my patches. Spent all night programming the SX-240, it is quite a beast and responds well to programming!

Thanks for your help and comments.

-JB

--- 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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