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July 2008

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Subject:
From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Wed, 30 Jul 2008 11:20:36 -0700
Content-Type:
text/plain
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text/plain (102 lines)
Not to stand on ceremonies, but the wedding of the antenna requirements
and the assembly process will be difficult, however done properly the
reception will be great.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Wednesday, July 30, 2008 10:56 AM
To: [log in to unmask]
Subject: Re: [TN] Ceramic Varistor Test Failures

Hi John,

mobile telephone antenna circuit? No wonder it doesn't work.  It's a 
extremly low capacitance antenna to 'ground', sometimes less than 2pF.
And a 
demand for low parasitic currents. You are probably right when you point
at 
flux residues. This component should

1. not be  hand soldered
2. be maximum cleaned

My 2 pF

Inge



----- Original Message ----- 
From: "John Anselmo" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 29, 2008 2:08 PM
Subject: [TN] Ceramic Varistor Test Failures


Dear All,

We have been seeing an increase in test failures of the ceramic varistor

(AVX P/N VC060314A300) when these components are near a connector that
we 
hand solder.
I suspect it is contamination from the flux used for hand solder.  We
fix 
the test failure by resoldering the varistor, and all is well at retest.
We do a water wash after hand solder, but still see a 20% to 40% test 
failure rate.  Has anyone experienced this before?  Waht was done to fix
the 
problem?

Thanks in advance for the help.

John Anselmo
Manufacturing Engineer
S&K Electronics, Inc.

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