Yamaha CS80

We've been trying to sort this one out for awhile-  please help Mr.  
Spong... : )


When no signal from a voice card is first traced to a VCA, where the  
signal doesn't show, what methods do you use to troubleshoot where  
and how it's being pulled down and overheating several chips in the  
surrounding path. Obviously its a current draw issue, but I don't  
want to damage more components in the process of replace and retest.  
(When replacing just the first VCA chip that has no output, it  
overheats the replacement if you leave it in circuit) IC3 and 4 are  
specifically troublesome, as they are common output.


Thanks!

Stephen Teller

[Non-text portions of this message have been removed]

sounds to me like you need a scope and perhaps a qualified technician.





--- In yamahacs80@yahoogroups.com, Stephen Teller <s.teller@...> wrote:

>
> We've been trying to sort this one out for awhile-  please help Mr.  
> Spong... : )
> 
> 
> When no signal from a voice card is first traced to a VCA, where the  
> signal doesn't show, what methods do you use to troubleshoot where  
> and how it's being pulled down and overheating several chips in the  
> surrounding path. Obviously its a current draw issue, but I don't  
> want to damage more components in the process of replace and retest.  
> (When replacing just the first VCA chip that has no output, it  
> overheats the replacement if you leave it in circuit) IC3 and 4 are  
> specifically troublesome, as they are common output.
> 
> 
> Thanks!
> 
> Stephen Teller
> 
> [Non-text portions of this message have been removed]
>