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April 2000

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Subject:
From:
"Brad L. Matthies" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 10 Apr 2000 07:52:03 -0500
Content-Type:
text/plain
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text/plain (66 lines)
Mark,

Have you evaluated the solder volume of the joint?  We had a similar problem with a
TSOP component (several actually).  We found out that the lands were too large for the
leads, meaning we needed to add paste at printing (by redesigning the stencil
apertures) to compensate.  It worked out great!  We are currently redesigning the board
to correct for the problem.  Hope this helps.

BLM

Mark Holmes wrote:

> Hi all,
>
> We are experiencing problems with a 6-way surface mount connector. The part
> in question is a Harwin part M22-634XX22R.
> And to a lesser degree the mating part M22-C107133C. The problem is that the
> joints do not appear wetted at all, the
> component legs seem to be sitting on top of the solder and the slightest
> force will cause the connector to fall off. The
> problem is currently being investigated by our manufacturing department, but
> I am keen to glean as much info as I can
> as to the possible cause. As is the first time with have used a surface
> mount connector, any advice would be most appreciated.
>
> Best regards,
>
> Mark.
>
> Mark Holmes PCB Designer
> Helvar Merca Ltd.
> Hawley Mill, Hawley Road,
> Dartford Kent. DA2 7SY
> Tel: 01322 22 22 11
> Fax: 01322 282 286
> mailto:[log in to unmask]
> http://www.helvar.com
>
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