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Date: Thu, 13 Jan 2005 22:46:41 -0500
From: "Stephen B." <myspamnospamd9.net>
Subject: Re: Possibility of Saab closure


"Dexter J" <lamealameadingdongnospamlamelame.org> wrote in message news:opskkldnpgngtaownospam.eastlink.ca... > Salutations: > > On Thu, 13 Jan 2005 20:22:52 -0500, Stephen B. <myspamnospamd9.net> wrote: > > > When we are doing our failure analyses at work, we first x-ray the part. > > Then we (I do not do the actual work) soak the epoxies part in heated > > Uresolve(r) or Megasolve(r), cocktails of solvents. After an hour or so > > it > > softens up the epoxy and you can pull it away. > > > > Those solvents are probably unavailable to the home mechanic. But maybe a > > mixture of paint thinner and other solvents will work over a longer time. > > > > Stephen B > > > > > Very interesting. So, if I understand the next logical step - you can in > theory end up with a stack of individual coils and whatever mysterious > supporting electronics make up the $800 Canadian part? You know, all open > in front of you such that you could review the components and repair > rather than toss the whole thing and buy yet another round? > > I wonder if the cocktail peels the transformer part numbers and circuit > silkscreening. I just happen to have a spare DI unit as of this afternoon. > Sorry to hear you acquiring a spare unit (assuming a failure). From the blocks I have seen, you may luck out and be able to read the numbers, but I would not count on it. Our epoxy and I think most manufactures of electronic blocks use various fillers to improve heat transfer and dielectric resistance. The solution does not seem to effect the filler, but dissolves the epoxy leaving the filler which can be broken away. These are some dangers you should be aware of. The part numbers could be printed in epoxy ink, and gets dissolved. The structure of the inner components are frequently epoxy also and damaged. these chemicals can also eat away at the solder joints and other unexpected places. I would definitely suggest trying to get an x-ray first so you have some idea what is inside. at which time you could probably cut the unit down and just open up one unit. If you want to contact me off line and send the unit to me, I should be able to arrange to do all of this and send you the pictures and remains. Stephen

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