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

[DCMagnuson at aol.com]

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