Hi John, Ingemar,

The only way I recommend to check (first in prototypes) a pre tinning
process as follows:

1.    Preform the capacitors to the final shape.
2.    Assemble the capacitors on Platte of FR4 drilled to the right pitch
(without any copper plate on surface or in holes).  The holes should be
about 1.5 mm greater than the capacitors leads diameter.
3.    Use an aggressive flux in your wave soldering and pre heating and
soldering as usual.
4.    Clean the capacitors with solvent.
5.    Check the results.

Pls inform results.


Best  Regards

ROKAH Reuven




                      "Ingemar Hernefjord
                      (KC/EMW)"                      To:      [log in to unmask]
                      <ingemar.hernefjord@ER         cc:
                      ICSSON.COM>                    Subject: Re: [TN] Question about wetting
                      Sent by: TechNet
                      <[log in to unmask]>


                      20/10/2003 10:05
                      Please respond to
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                      Forum."; Please
                      respond to "Ingemar
                      Hernefjord (KC/EMW)"





Listening with great interest. THIN layer of tin over nickel, what a
situation! If the nickel has degraded too, I just wonder how on earth it
can be  restored. The guru advices are many, hope one or the other will
work. Please, let us know who got beer for the rest of his life...

Ingemar Hernefjord
Ericsson Microwave Systems


-----Original Message-----
From: John Foster [mailto:[log in to unmask]]
Sent: den 17 oktober 2003 20:14
To: [log in to unmask]
Subject: [TN] Question about wetting


I have a  large inventory of trim capacitors that have exceeded the
manufacturers shelf
life by 2 years. Solderability testing has revealed inadequate wetting. The
parts are on
tape and reel. The plating is a thin layer of tin over nickel. We believe
we
have a oxidation problem. Does anyone have any ideas AT ALL on how we can
recover these
parts. The part has gone obsolete I have 86,000 of these things that I
really really need to use.

Any help would be appreciated

Thanks
John Foster

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