Vintage Synth Repair

Hi Davide

 

The question that needs answering is how did you clean up the dreaded
leaking battery?  Have you removed the batteries?  Before doing anything at
all disconnect the unit from any mains power.

 

The procedure I always follow with this scenario is to remove the batteries
and throw them away.  Then swab the affected area with warm water mixed with
bicarbonate of soda.  This alkali solution will neutralize the battery acid.
The battery contacts will need very careful attention to ensure that all
traces of the acid have been removed.

 

For solution quantities I use a small cup of warm water and a couple of
teaspoons full of bicarb.  I get my bicarb from the chemist in 500gm packs
and is medicinal quality.

 

Once you are sure that all traces of acid have gone swab the affected area
with clean water, dry off with a household paper towel and leave to dry in a
warm area - an airing cupboard is ideal.  Leave over night.

 

The following day replace with new batteries.  Switch on and see what
happens.

 

Now in your case the disconnected capacitor needs to be re soldered back
into place first.

 

Without knowing which capacitor has come adrift it is impossible to say
whether or not that could cause a completely dead situation, but yes it is
possible.

 

Hope this helps.

 

Regards

 

Brian G3OYU

 

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From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of
pasquale.aprea@...
Sent: Thursday, 12 May, 2005 11:00
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] siel DK-600 expander

 

Dear list,
i bought recently a siel expander, dk-600 tabletop module version.
after messing with sysex informations found over the net i was able to
program
it from my windows computer(despite what someone says, handshaking is not
a must, so programming it without the keyboard version is possible.)
So far i was happy.

Of course the day i opened the machine up i found the dreaded battery
leakage
problem. I decided to try cleansing it and apparently succeded.
But soon it started behaving strangely, so i took it apart again and found
a capacitor leg broken! i don't have the facilities nor knowledge to solder
it on my own (i can hear you laughing) so i abandoned the quest.
Today, after a month of inactivity i pushed the on button and the poor synth
seems to be DEAD.

My humble questions are: can a single capacitor disconnected kill the
machine?
i could run it without capacitor a month ago, the machine would freeze
itself
after a minute or so.

Also i read about korg polysix not to touch the inside without antistatic
precautions not to burn cmos circuits. i dont know if it is the case, but
i didn't took any precaution. And anyway between dk600 life and death
passage
i didnt touch it no more, so it must be something i did that killed it
slowly
during the month of inactivity. It shows no sign of corrosion now, traces
are intact.

any advice anyone?
thanks, davide





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