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<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff size=2>Have
you looked for cold ( cracked ) solder joints? They can be very hard to find,
however now that the board is clean it will be easier. Breathe on the board
closely to create a fog on the solder joints. Hairline cracks will
show up as a thin ring around the pin which is protruding through the board. You
might be surprised to find many of these which is a common failure on most wave
soldered boards. </FONT></SPAN></DIV>
<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff
size=2>Thermal flexing over time can open these cracks and make problems occur
years after the board was made. </FONT></SPAN></DIV>
<DIV><SPAN class=505503701-15102003></SPAN> </DIV>
<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=505503701-15102003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
owner-synth-diy@dropmix.xs4all.nl
[mailto:owner-synth-diy@dropmix.xs4all.nl]<B>On Behalf Of
</B>gilwein@walla.co.il<BR><B>Sent:</B> Tuesday, October 14, 2003 9:01
PM<BR><B>To:</B> synth-diy@dropmix.xs4all.nl<BR><B>Subject:</B> [sdiy] strange
symptoms<BR><BR></FONT></DIV>
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<DIV name="wrteplaceholder"><BR>Hi.</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I have that problematic Kawai SX210 which
had it's battery leaking,</DIV>
<DIV name="wrteplaceholder">probably causing it to behave strangely like
playing notes automatically</DIV>
<DIV name="wrteplaceholder">and playing a few notes when you hit only
one key.</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I clean all the defective are and replaced a
few parts,</DIV>
<DIV name="wrteplaceholder">replaced the battery and resoldered a few
wires.</DIV>
<DIV name="wrteplaceholder">also cleaned up the whole pcb.</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">Than it actually stopped playing
automatically, </DIV>
<DIV name="wrteplaceholder">and a few notes when you hit one key,</DIV>
<DIV name="wrteplaceholder">BUT, now it misses some notes
sometimes,</DIV>
<DIV name="wrteplaceholder">and sometimes when you hit
a chord</DIV>
<DIV name="wrteplaceholder">the sound comes out in pulses. Also it will
play some notes</DIV>
<DIV name="wrteplaceholder">with a slightly different sound than the
preset used.</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I replaced a few capacitors and just when
starting it up </DIV>
<DIV name="wrteplaceholder">the dial wheel has stopped to respond and I
now cannot edit</DIV>
<DIV name="wrteplaceholder">any of the parameters !!!</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I noticed that there's a short between two
transistor legs</DIV>
<DIV name="wrteplaceholder">that comes on and off (the transistor
is not leaking and is OK).</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I mean sometimes the short is there but
sometimes it is not .....</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">how can this be caused and is this normal
?</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I also noticed that the EPROM chip and
another (very) large</DIV>
<DIV name="wrteplaceholder">chip made by Intel, are getting warm after a
few minutes of operation (but not too warm...)</DIV>
<DIV name="wrteplaceholder">is that normal ?</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">moreover, is there any chance that the EPROM
programming </DIV>
<DIV name="wrteplaceholder">has gone defected ?</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">Thanks,</DIV>
<DIV name="wrteplaceholder"> </DIV>
<DIV name="wrteplaceholder">I really want it to get fixed !<BR></DIV>
<DIV name="wrteplaceholder">
<HR SIZE=1>
</DIV></TD></TR></TBODY></TABLE><BR>
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