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February 2010

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Subject:
From:
Mike Sewell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mike Sewell <[log in to unmask]>
Date:
Mon, 8 Feb 2010 13:05:52 -0600
Content-Type:
text/plain
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text/plain (277 lines)
Somewhat more abrasive than the eraser, a fiberglass pencil will work
also.  I've used them to clean severely oxidized pads with good results
when an eraser wasn't quite enough.

Mike


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon (SA-1)
Sent: Monday, February 08, 2010 9:41 AM
To: [log in to unmask]
Subject: Re: [TN] contact cleaner- recommendation

Erasers are made from rubber. I know if you look up what erasers are
made of you get all kinds of chemicals or materials. The biggest thing
is it can made of natural material or synthetic materials.  I believe
(hard to know or at least for me since I am not chemist) that synthetic
may contain silicone. I thing the only way is to have it tested or ask
the manufacture. All my training through the years I was informed to
tell my students not to use erasers for the possibility that it could
contain silicone. 

I decided to check for ESD properties and took two erasers (one on the
end of a mechanical pencil and one was just a standalone eraser) and
using a ESD static meter found by rubbing the erasers on an ESD mat,  I
could charge the erasers. 

Just putting in my two cents worth. Jon


  
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Monday, February 08, 2010 9:25 AM
To: [log in to unmask]
Subject: Re: [TN] contact cleaner- recommendation

Never really knew.  We developed the chemical cleaning into a process
after out 6 Sigma black belt "guru" validated it for production and
refurbishment use.  Fortunately, the VP of Engineering reviewed it and
went along with my and my Quality guy's objections that the test
criteria were way too subjective and it wasn't sufficiently proven.
Amazingly, the problem then seemed to go away.  A few months later, our
repair/refurb supervisor disclosed he'd begun using the eraser to clean
the edge connectors of the tuner cards and simply not tell anyone.  Even
the extensive FA we had done be a very reputable lab, never really
defined the problem.  

We still have units reach our field reps that tested fine before
shipping, but don't boot up.  They remove the cover and reseat the tuner
card and memory sticks on the mother board and everything works
perfectly for the two to five years the meter is in a home.  Go figure.


Bob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Monday, February 08, 2010 9:32 AM
To: [log in to unmask]
Subject: Re: [TN] contact cleaner- recommendation

How much gold was removed after each cleaning with the 'ol pencil
eraser?
How was the residue remove from the card/board?
Did it cure the issue?

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
Sent: Monday, February 08, 2010 7:57 AM
To: [log in to unmask]
Subject: Re: [TN] contact cleaner- recommendation

About three years back, we went through an extensive testing process of
all the commercial cleaners out there, including having FA performed on
samples due to what appeared to be connector fretting on our meters.
None worked easily and even the best required extensive scrubbing and
cleaning.  We finally settled on Chester's solution, the good 'ol pencil
eraser in stick form, and the problem was solved. 


Bob Croslin
The Nielsen Company

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Harner, Chester
Sent: Friday, February 05, 2010 6:11 PM
To: [log in to unmask]
Subject: Re: [TN] contact cleaner- recommendation

#2 Eberhard Pencil (NASA)

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Friday, February 05, 2010 2:29 PM
To: [log in to unmask]
Subject: [TN] contact cleaner- recommendation

Hi All,
         In market what is the most common and good contact cleaner
used? To ensure better, reliable and long term contact. Thanks.
Regards
GA Tan 
 

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