[sdiy] finding a short in a Yamaha CS-50/CS-80

[Bob Weigel]

OH yeah absolutely check the tantalums for shorts.  The worst problems 
I've seen in these units though were from when the power supply of a 
cs-20m had a regulator problem where it overvoltaged everything.  I'm 
still dealing with that.  Anyone have a vcf they want to sell me?  The 
vcf leaks slightly making a crappy irritating subtle noise. I need to 
scrap something else to get VCA's and a VCF.  If you ever see an organ 
getting tossed from that era SNAG IT because some of the parts are the 
same. 1976 is too early; all transistor usually on those organs.-Bob

Csaba Zvekan wrote:

> Ingo is right check the tantalum capacitors . They are all over the  
> place. I remember having a short on one of the TBS boards. Check TBS1  
> or TBS2 boards there are plenty of tantalum 0.33uF s there.
> It's a good practice to replace all of them tantalums anyway today  
> it's this guy here tomorrow on another board. If you know what I mean.
> Is it a CS-50 or CS-80 ?
>
> Csaba
>
>
> On Oct 29, 2008, at 6:05 PM, Ingo Debus wrote:
>
>>
>> Am 28.10.2008 um 21:38 schrieb jpitt at fhcrc.org:
>>
>>> Do I have to desolder every single +15 and -15 line off every board  
>>> to track down the short or is there an easier way?
>>
>>
>> First thing I would do is search for anything that gets hot.  
>> Careful, the offending component probably gets *very* hot.
>>
>> If this doesn't help, I'd take a close look at all tantalum  
>> capacitors (if there are any). I've seen failed ones that looked  
>> fine but had just a tiny silver ball (like a solder blob) on them.
>>
>> Ingo
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