Vintage Synth Repair

I'd agree.. Some dry joints I've found were invisible.
Maybe prod the board with a plastic pen to get an idea where the dry joint is located, then resolder everything in that location within a wide radius.
Either that, or as mentioned.. Resolder everything.


Sent from my Apple ][e

On 01/11/2011, at 6:31 PM, timothy kosiorek <tkosiorek@...> wrote:

> it might be tedious but I go through and resolder all solder points,it takes a little time but can be well worth it, a lot of times the dry/cold solder joint can not be seen even with the highest magnification.
> Tim K.
> 45 years keyboard technician
> 
> 
> 
> To: vintagesynthrepair@yahoogroups.com
> From: jose.gouveia.pereira@...
> Date: Tue, 1 Nov 2011 07:19:28 +0000
> Subject: RE: [vintagesynthrepair] Finding a dry joint...!?
> 
> 
> 
> Hello.
> 
> Try to use a magnifying glass and a strong light to check the circuit board and the soldering joints of the components.
> 
> Using a multimeter, check if the power supply is distributed thru the board.
> 
> You can find the schematics on the following link:
> 
> http://soundprogramming.net/synthesizers/yamaha/yamaha_dx100
> 
> Good luck!
> 
> Best regards.
> 
> Jose
> 
> Portugal
> 
>  
> 
> De: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] Em nome de Quazimodo
> Enviada: segunda-feira, 31 de Outubro de 2011 23:47
> Para: vintagesynthrepair@yahoogroups.com
> Assunto: [vintagesynthrepair] Finding a dry joint...!?
> 
>  
> 
>  
> 
> Hi guys,
> 
> Trying to fix a dead DX100 here. I have isolated the problem to a dry joint or open circuit somewhere. If I slightly twist or bend the main circuit board it all springs into life! This could take a while...;c)
> 
> Any techs here have any tips that could increase my chances of pinning down the problem...?
> 
> Cheers,
> TOM
> 
> 
> 
> 
>