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Thread
2011-10-31 by Quazimodo
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
2011-11-01 by José Pereira
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
2011-11-01 by timothy kosiorek
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
2011-11-01 by Mike
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 > > > > >
2011-11-01 by Quazimodo
Hey thanks to everyone for the replies...;c) I found the problem today. It was easier than I expected. I wore glasses, used a magnifying glass and also applied light pressure and the suspect area showed itself..! Cheers all. TOM --- In vintagesynthrepair@yahoogroups.com, 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_dx100Good luck!Best regards.JosePortugal 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 >
2011-11-02 by Michael Casino
Hold the circuit board to a good bright light. You may want to use a magnifying glass and examine all the traces from the opposite side of the board. Hold the circuit board to a good bright light. You may want to use a magnifying glass and examine all the solder joints on both sides of the board. Mike
From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of Quazimodo Sent: Monday, October 31, 2011 7:47 PM To: vintagesynthrepair@yahoogroups.com Subject: [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
2011-11-02 by duncan
I had a bad joint on a keyboard scanner IC in a yamaha AN1X; every fourth key wouldn't work, or something- I forget the exact symptoms. this enormous surface mount processor with about twenty pins on each of the four sides.... & one connection was slightly *lifted*. you'd never see it from the top- look at these ICs edge-on too, to see if their legs are all touching the board. a jeweller's loupe or one of those usb microscopes are good for this type of work. duncan.