[sdiy] what do cold solder joints look like?/csq update

[Eduardo]

Thanks Dave,

I actually did resolder all the joints that looked funky, and a couple that
just looked at me the wrong way ;)  I did it just because I wanted to feel
like I was actually doing something to fix it, since I didn't think this
would do it.

let's hear it for dumb luck!!

Eduardo
----- Original Message -----
From: <DCMagnuson at aol.com>
To: <ElmacacoX at aol.com>; <synth-diy at node12b53.a2000.nl>
Sent: Friday, June 01, 2001 1:04 PM
Subject: Re: [sdiy] what do cold solder joints look like?/csq update


> In a message dated 6/1/01 12:23:12 PM Eastern Daylight Time,
> ElmacacoX at aol.com writes:
>
> > thanks for the tips on solder joints.  my csq100 was having trouble
keeping
> >  time on looped sequences, so I opened it up and noticed that some of
the
> >  solder joints looked cloudy (think storm cloud murky grey) and some
were a
> >  pleasant gold color.  I reheated these sometimes adding new solder
until
> the
> >
> >  greyness disappeared, sometimes the gold color disappeared, other times
it
> >  stayed in a diluted form.   I was paying particular attention to the
areas
> >  marked clock and tempo.
> >
> >  everything works fine now, thanks guys, I'm glad it wasn't a bigger
> problem.
> >
>
> Without looking at the solder joints, it's hard to say for sure, but the
gold
> color you mention may be flux.  It probably wouldn't be a bad idea to use
> some flux remover on the entire board (if you haven't already done so).
>
> Also...you mentioned reworking the joints on the tempo/clock section of
the
> board...you should probably do the entire synth if there are more cold
solder
> joints elsewhere.  These little buggers can cause all kinds of weird
> intermittent problems.
>
> Dave Magnuson
>