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July 2008

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Mon, 21 Jul 2008 16:06:40 -0500
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Hi Karen!

I think it's worthwhile. I think the most important thing that's taught
is that one needs to really think and analyze what the objective is when
reworking or repairing anything. The training details out three levels
of conformance, and then it's up to (in my case, our customers) whether
or not they want to accept the rework or repair of the product we build
for them. It's not just a "make it look like it used to" type of deal,
you need to deeper than just cosmetic appearances.

The training goes through and gives you "hands-on" experience with the
basic rework and repair methods which is a good foundation to build on
as one does more and more rework and repairs.

BTW, I really liked my class! Couldn't have been in a more scenic area,
only wish I had more time to explore!

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Capps
Sent: Monday, July 21, 2008 12:57 PM
To: [log in to unmask]
Subject: Re: [TN] IPC 7711/7721 training

Separate topic, how was the IPC 7711/7721 training class?  Worthwhile?
We have been considering it....

Karen H.A. Capps
HR Manager (acting)
(850) 539-2500 x257
(850) 539-2509 Fax#
 

www.teligentems.com

 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, July 21, 2008 1:54 PM
To: [log in to unmask]
Subject: Re: [TN] Solder balls

Hi Genny!

Sorry it's taken me a bit to get your picture posted, but I just got
back from 2-weeks vacation and a week in Colorado going to a
IPC-771/7721 instructor certification class, so I've been catching up on
things this morning. But here is your picture:

http://stevezeva.homestead.com/files/solderballs-QFN.jpg

Myself, I wouldn't worry about them tiny solderballs. They probably
aren't going anywhere, and besides if they did, they're so small what
problem could it cause?

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Monday, July 21, 2008 10:52 AM
To: [log in to unmask]
Subject: [TN] Solder balls

Have you ever gotten a much better analytical tool available to you, and
have it cause major panic due to what you can see now that you never saw
before?
We got a major fancy dancy brand new X-Ray.
Now we see things like the attached picture.  Steve, could I trouble you
to post it for me?  
 <<solderballs-QFN.jpg>>
Our old X-Ray would have never seen this.
Would you fail these solder balls?

It is a QFN, 0.5mm pitch, 0.3mm pad width with a heat slug.
I think trying to replace this device by hand would cause more trouble
than we see right now.

Genny 

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