The Kawai & Teisco Analog Synths Group

Seems as this is the situation.

I personally scrathed out all traces a the area, replaced most 
components and point-to-point rewired the traces between them


--- In kawai_sx210@yahoogroups.com, "Mark Daborn" 
<darkest.yugo@n...> wrote:
> Hi, my SX-210 is still non functioning.
> 
> At present, after replacing the battery which had leaked 
everywhere, poly 8 mode produces mostly silence except occasionally 
when the correct tone sounds. The other occasions when it makes a 
sound, its almost as if its disregarding the parameters and creating 
a random patch!
> 
> Poly 4 mode only seems to have two voices sounding one of which is 
a shrill tone, the other almost appearing normal. When it does 
decide to make a noise, that is.
> 
> Mono mode just makes the loud shrill sound as if the filter is 
wide open with a lot of resonance.
> 
> The leds on the front seem to light up in random order and for 
other parameters than the one pressed!
> 
> Has anyone had or heard of similar behaviour as this? I plan to 
fault find the main pcb as soon as i can get a chance to do it. Any 
clues as to where to start first would be appreciated!
> 
> Someone i spoke to seemed to think that the due to the leaking 
battery, the board might have absorbed some of it and is creating 
shorts. It has been suggested that i soak the pcb in de-ionised 
water to try to draw out the conductive ions.
> 
> Thanks for all your help. If anyone has a copy of the service 
manual, that would assist me no end!

--- In kawai_sx210@yahoogroups.com, "Mark Daborn" <darkest.yugo@n...> 
It would be impossible to create a patch, with the parameters jumping
around. If the traces are not visually damaged, I suspect poor
connection / contact somewhere.

Hope you can locate the problem without destroying the sx.





wrote:
> Hi, my SX-210 is still non functioning.
> 
> At present, after replacing the battery which had leaked everywhere,
poly 8 mode produces mostly silence except occasionally when the
correct tone sounds. The other occasions when it makes a sound, its
almost as if its disregarding the parameters and creating a random patch!
> 
> Poly 4 mode only seems to have two voices sounding one of which is a
shrill tone, the other almost appearing normal. When it does decide to
make a noise, that is.
> 
> Mono mode just makes the loud shrill sound as if the filter is wide
open with a lot of resonance.
> 
> The leds on the front seem to light up in random order and for other
parameters than the one pressed!
> 
> Has anyone had or heard of similar behaviour as this? I plan to
fault find the main pcb as soon as i can get a chance to do it. Any
clues as to where to start first would be appreciated!
> 
> Someone i spoke to seemed to think that the due to the leaking
battery, the board might have absorbed some of it and is creating
shorts. It has been suggested that i soak the pcb in de-ionised water
to try to draw out the conductive ions.
> 
> Thanks for all your help. If anyone has a copy of the service
manual, that would assist me no end!

If the battery leaked everywhere , then you have quite a mess to clean up. I detailed the procedure for neutralizing the battery goop elsewhere in this list.

--- In kawai_sx210@yahoogroups.com, "Mark Daborn" <darkest.yugo@n...>

This reminds me of my sx 240. I had a short somewhere. I went from no
sound to random jumping lights. I never isolated the short, but with a
few pieces of small foam board was able to stabalize the main pc board
within the frame to cut out the short in a good working position. I
would recommend using mono to at first. Some of my patches on poly 8
are noise, but in mono are heavenly. and vice vera..... My 210
functions perfectly and yet to run out of amazement over it's
capability. So please seek a pro before too much is done. Anyway good luck

















 wrote:
> Hi, my SX-210 is still non functioning.
> 
> At present, after replacing the battery which had leaked everywhere,
poly 8 mode produces mostly silence except occasionally when the
correct tone sounds. The other occasions when it makes a sound, its
almost as if its disregarding the parameters and creating a random patch!
> 
> Poly 4 mode only seems to have two voices sounding one of which is a
shrill tone, the other almost appearing normal. When it does decide to
make a noise, that is.
> 
> Mono mode just makes the loud shrill sound as if the filter is wide
open with a lot of resonance.
> 
> The leds on the front seem to light up in random order and for other
parameters than the one pressed!
> 
> Has anyone had or heard of similar behaviour as this? I plan to
fault find the main pcb as soon as i can get a chance to do it. Any
clues as to where to start first would be appreciated!
> 
> Someone i spoke to seemed to think that the due to the leaking
battery, the board might have absorbed some of it and is creating
shorts. It has been suggested that i soak the pcb in de-ionised water
to try to draw out the conductive ions.
> 
> Thanks for all your help. If anyone has a copy of the service
manual, that would assist me no end!

I repaired my SX210 (battery leakage) by actually cutting off ALL the 
traces, ICs and other components at the leakage affected area, and 
rebuilding it by making point-to-point wiring and reinstallation of 
the relevant component of course.

Usually when the battery leaks, it can do harm that is not visible to 
the eye, so retracing is most of the times necessary and components 
at the area are recommended to be replaced even if you can't see and 
corrosion on them.

The problem you describe sounds like computer board malfunctioning 
which is probably due to the leakage.



--- In kawai_sx210@yahoogroups.com, "texhand" <texhand@y...> wrote:
> --- In kawai_sx210@yahoogroups.com, "Mark Daborn" 
<darkest.yugo@n...>
> 
> This reminds me of my sx 240. I had a short somewhere. I went from 
no
> sound to random jumping lights. I never isolated the short, but 
with a
> few pieces of small foam board was able to stabalize the main pc 
board
> within the frame to cut out the short in a good working position. I
> would recommend using mono to at first. Some of my patches on poly 8
> are noise, but in mono are heavenly. and vice vera..... My 210
> functions perfectly and yet to run out of amazement over it's
> capability. So please seek a pro before too much is done. Anyway 
good luck
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>  wrote:
> > Hi, my SX-210 is still non functioning.
> > 
> > At present, after replacing the battery which had leaked 
everywhere,
> poly 8 mode produces mostly silence except occasionally when the
> correct tone sounds. The other occasions when it makes a sound, its
> almost as if its disregarding the parameters and creating a random 
patch!
> > 
> > Poly 4 mode only seems to have two voices sounding one of which 
is a
> shrill tone, the other almost appearing normal. When it does decide 
to
> make a noise, that is.
> > 
> > Mono mode just makes the loud shrill sound as if the filter is 
wide
> open with a lot of resonance.
> > 
> > The leds on the front seem to light up in random order and for 
other
> parameters than the one pressed!
> > 
> > Has anyone had or heard of similar behaviour as this? I plan to
> fault find the main pcb as soon as i can get a chance to do it. Any
> clues as to where to start first would be appreciated!
> > 
> > Someone i spoke to seemed to think that the due to the leaking
> battery, the board might have absorbed some of it and is creating
> shorts. It has been suggested that i soak the pcb in de-ionised 
water

> to try to draw out the conductive ions.
> > 
> > Thanks for all your help. If anyone has a copy of the service
> manual, that would assist me no end!