Adcom GFA-585 Limited Edition Repair - diyAudio
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Old 9th June 2005, 07:31 AM   #1
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Default Adcom GFA-585 Limited Edition Repair

I have an Adcom GFA-585 Limited Edition that needs repair. The Adcom repair folks told me that a cap leaked into a board. This causes the speakers to emit a terrible crackling sound when the amp is first fired up. If I let it warm up for an extended period, it will play without noise. As soon as it cools down, the crackling reappears. Adcom states that repair parts are no longer available.

This amp is one of my favorite pieces of gear and I cannot afford what it would cost to get something comparable.

If anyone knows where I can get this repaired, you will earn my unending gratitude.

Maybe I should offer a reward for information leading to the repair of this amp!
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Old 9th June 2005, 08:21 AM   #2
Gasho is offline Gasho  Croatia
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If you donīt know how to repair your amp , maybe the best solution is to take amp and let someone of audio electronics gurus from this forum to repair it for you.
Someone from your town or state.
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Old 9th June 2005, 01:06 PM   #3
anatech is offline anatech  Canada
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Or an authorized warranty depot. A good one. It is unlikely that there is no sub for your caps. The leakage should be visible on the board, but I haven't heard of this as a specific fault or weakness. It is possible.

Too bad I'm in Canada, shipping is a supreme pain (border thing).

-Chris
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Old 9th June 2005, 07:03 PM   #4
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Maybe I wasn't too clear on my initial post. It has been to Adcom for repair. When the cap leaked, the fluid got into a board and the board needs replacing. They state they no longer have the board to repair it.

Maybe someone knows of a source for this part or of an independent repair shop that can help.

I'll ship it anywhere if it can be fixed.
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Old 10th June 2005, 02:20 AM   #5
anatech is offline anatech  Canada
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Hi,
The board can be cleaned. If damaged it is not extremely dificult to recreate the board. Labour intensive.
The original board may need to be stripped for cleaning and for sure to use as a template.

I can do this but there must be someone closer who can. I don't like to deal with the border either.

-Chris
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Old 10th June 2005, 03:39 AM   #6
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What I was told was that the board needed to be replaced. I don't know anything about circuit boards.

I'm sure if there was a way to repair a board, I could find someone in the area to do it. Just what kind of business would have this kind of skill? What industry should I be searching for?

In short, where do I start and where would I look?

I appreciate the answers to my question.
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Old 10th June 2005, 04:12 AM   #7
anatech is offline anatech  Canada
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Hi wilsonmw,
The board needs to be looked at. If the leakage isn't too bad, the area is stripped of parts and cleaned, then reassembled. This may include the entire PCB. If there is damage, the old board is stripped and used as a drilling guide to make a new PCB.

The process is pretty straight forward but may set you back $300.00 or so in labour and parts. The most important quality in your tech will be carefull, neat work

I have successfully rebuilt boards with holes burned in them, and copied obsolete boards that were water damaged (most foil corroded off). Not to mention ones burned in half or broken. It is possible to do a long lasting job.

-Chris
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Old 2nd November 2005, 02:36 PM   #8
lordfoo is offline lordfoo  Philippines
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I have a 585 and my brother can make a copy of the board for you, remove the parts installed in your board and install it in the new board. We won't be able to procure the parts in your old board that's damaged. also i am in manila.
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Old 3rd November 2005, 08:26 AM   #9
clem_o is offline clem_o  Philippines
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If the amp still manages to operate, I'd hazard a guess that it can't be damaged that badly (yet). I agree with Chris' view that it should be possible to just clean out the board. It may not even be necessary to remove the parts in the affected area.

Soap and water does a very good job; however if you're not familiar with electronics I'd suggest not trying to do it yourself... (it's very easy to turn a potentiometer and not know its original setting)... BTW, the leaked stuff from the bad capacitor is corrosive, and will continue to damage your PCB more and more. Best you get it cleaned out asap.


Cheers!
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Old 3rd November 2005, 08:52 AM   #10
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Cleaning the board. I've done this before.
Two things to be careful about.
1. Any solvent used must not dissolve anything on board ( like plastic parts).
2. Most of the water must be removed quickly as it could be
absorbed by the board.

Make a mild soap solution ( I prefer dish washer liquid soap ) and dip the board in it and brush clean it with a long hair paint brush ( maybe 0.5 inches wide ) for a few minutes. Five minutes minutes should be enough I think. More , if the contaminating residue is dry - say 15 minutes or so.
Then wash away the soapy water well with distilled water.
Finally rinse the board with a mixture of pure isopropyl alcohol and distilled water. I use a 50 : 50 mixture.
The remaining water should come away quickly. Hand shake dry.
Dry the board with a hot air gun or in an 'OPEN' oven ( set at 100 deg C ). Monitor the drying process and DO NOT leave it in the oven without supervision.You cannot afford to overheat the components especially any electrolytic capacitors. The idea is to evaporate the water as soon as possible. Alternatively , dry it in a draft of air from a fan. This might be much safer.

I have overheated a board in an oven kept shut and lost it !
Cheers.
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