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June 2000

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Subject:
From:
Paul Klasek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 13 Jun 2000 11:39:49 +1000
Content-Type:
text/plain
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text/plain (151 lines)
What took you so long Peter, looks neat

Would you have an averaged spec of achievable plated thickness (um),
on both Ni & Au , coverage, etc. ?

thanks for the file

paul klasek
http://www.resmed.com

-----Original Message-----
From: Peter Swanson [mailto:[log in to unmask]]
Sent: Friday, 9 June 2000 21:17
To: [log in to unmask]
Subject: Re: [TN] Loaded board rework


In message  <[log in to unmask]> [log in to unmask] writes:
> In a message dated 06/07/2000 7:09:16 PM Central Daylight Time,
> [log in to unmask] writes:
>
> > Do you mean they want NiAu on contact fingers and/or contact pads,
> >  i presume, common enough design "mistake" .
> >  Done it , conformals won't protect your beans from bath compositions;
> >  i poured latex over all but the pads in questions
> >  (you face a serious chore of fine shaving and polishing down to
copper),
> >  than replate , than peel all the latex off (multi's spot on would do),
> >  clean .
> >  Noo , you definitely do not gild over solder.
> >  If you handle it with feel for stress/flex/esd/etc.,
> >  yo may live to tell .
> >  Steve will tell you all the spot plating kits,
> >  if don't feel game to dip plate .
> >  You may search some on http://www.riogrande.com too
> >
> >  paul
>
> Hi again Ralph!
>
> After reading Pauls response, it makes more sense in assuming that you
have
> some loaded boards that need gold plated contact fingers...but there's the
> "monkey-wrench".
>
> I do have a source for equipment to replate individual fingers, but that's
> usually for already plated fingers that may get a solder splash or two in
the
> contact area. One needs to remove ALL the solder in order to get the kind
of
> metallurgical bond that won't suffer "peeling" of the replated metal
because
> of the forces involved during the insertions and withdrawal of the board
(I'm
> assuming that it's some sort of PCI card, or plug-in board that inserts
into
> some sort of edge connector socket).
>
> Sounds to me like you have a MAJOR task trying to do this. Paul did say
that
> he's used latex to cover and protect components to replate in a bath, but
> there was a post not too long ago where someone was asking how to remove
> latex mask from between some fine pitch part leads that did not peel off
when
> removing the mask...tough stuff to do.
>
> Don't know how many boards you are talking about, but to remove any and
all
> solder traces from the fingers is a must for any replating to be
> effective...that's gonna be the bear...you're gonna need to get down to
bare
> copper. Then nickel will need to be plated, then the gold.
>
> The first question that comes to mind, is how did it slip by your customer
> when they first got the boards and wanted gold plated fingers, let them
get
> on the floor and get built? I know that's neither here or there, but makes
> you wonder...
>
> I know they are probably coming to you to try and help them out of a bad
> situation where it's not your fault at all, but just trying to see if
there's
> anyway that can be done to correct things for them...but in my opinion,
the
> damage is done.
>
> One comment, please don't take no offense, www.larrylobster.com has got to
be
> the most unusual and creative name for a fab shop that I've ever heard
of!!
> If I may ask, how did ya'll come up with that URL? Just curious....
>
> If you need the contact info on the manual replating kits, let me know. I
> have it all at work and I'm home now. I do know it's from a company
called;
> "Hunter Products" and it's called a "Micro-metalizer System". They don't
have
> a web page, but I do have the phone numbers and stuff like that...they're
on
> the usa east coast somewhere...

There is some information about this kind of product used specifically for
repair of gold finger contacts (or indeed any other kind of contact) on our
website at http://www.intertronics.co.uk/products/cipscrk.htm. We have a
procedure which is not on the web (yet!), but I would be pleased to forward
on.

Peter
--
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:::
Peter Swanson                                              Oxfordshire,
England
INTERTRONICS
[log in to unmask]
http://www.intertronics.co.uk

Suppliers of materials and consumables to the electronics & related
industries
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:::

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