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October 2009

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Guy Ramsey <[log in to unmask]>
Date:
Mon, 26 Oct 2009 13:39:13 -0400
Content-Type:
text/plain
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text/plain (218 lines)
I like this guess. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Monday, October 26, 2009 4:19 AM
To: [log in to unmask]
Subject: Re: [TN] Questions

Dear Manuel
I don't know if this is the cause of your problem but I have seen a
similar small number of joints with this appearance on a few boards in
the middle of a batch being caused by a problem with under screen
cleaning. The cleaning fluid contaminates the solder paste in a few
places but clears up after a few prints. It is associated with a stencil
problem where the operator decides to manually intervene. :-)
Regards
Rex


Rex Waygood
Technical Manager
 
Hansatech EMS provides value manufacturing through engineering and
quality
 
Hansatech EMS Limited
Benson Road
Nuffield Industrial Estate
Poole



 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849
Sent: 26 October 2009 01:41
To: [log in to unmask]
Subject: Re: [TN] Questions

Hi Manuel,

I'm sorry I didn't get your pictures posted sooner, but I have them up
now, and I'm posting everything to the TechNet for you. Your pictures
are here:

http://stevezeva.homestead.com/1a.JPG

http://stevezeva.homestead.com/2a.JPG

http://stevezeva.homestead.com/3a.JPG

http://stevezeva.homestead.com/5a.JPG

I posted the pictures that looked the best to illustrate your problem, a
couple of pictures were out of focus and it was hard to see the problem.

Were the IC's the only component that had this problem? That pretty much
eliminates the solderpaste if it was. It makes it harder to figure out
when you say that it was random and only on three boards. What was the
lead finsh on the IC's? I've had a few problems with lead-free (tin)
plating, but it's been with connectors.

Steve
  ----- Original Message -----
  From: Manuel Castro
  To: [log in to unmask] ; Werner Engelmaier
  Sent: Friday, October 23, 2009 7:00 PM
  Subject: Re: Questions


  Steven,

  Attached are the photos of the issues. We run this assembly through
our SMT oven and got a few boards (3) with this phenomenon at some of
the leads on this FPIC. The IC was the same part number but the location
was random on all 3 boards. The chemistry utilize during this build was
Lead Free NC. 

  How do I send the email to everyone at the TechNet forum?...


  Thank you All...


  Best regards,

  Manuel Castro Jr.
  Senior Process Engineering Manager
  [log in to unmask]
  Office: (408) 964-3044
  Fax: (408) 964-3001





  On Fri, Oct 23, 2009 at 1:14 PM, Werner Engelmaier
<[log in to unmask]> wrote:



    Hi Manuel,
    Steven is the GOOD guy doing the posting on his website-he recently
changed jobs, e-mails, etc.; so it might be best to ask him directly.
    Werner



    -----Original Message-----
    From: Manuel Castro <[log in to unmask]>
    To: [log in to unmask]
    Sent: Fri, Oct 23, 2009 1:11 pm
    Subject: Questions


    Hi Werner,

    I love to follow all TechNet forum but I still don't know where the
picture get posted from everyone that has an issue. Can you kindly tell
me what the link is. Do we need a password to access the pictures.
Lastly, if I have an issue where do I post the picture to share with the
team or whom do I sent it to?



    Best regards,

    Manuel Castro Jr.
    Senior Process Engineering Manager
    [log in to unmask]
    Office: (408) 964-3044
    Fax: (408) 964-3001



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CONFIDENTIALITY
This e-mail message and any attachments thereto, is intended only for
use by the addressee(s) named herein and may contain legally privileged
and/or confidential information. If you are not the intended recipient
of this e-mail message, you are hereby notified that any dissemination,
distribution or copying of this e-mail message, and any attachments
thereto, is strictly prohibited.  If you have received this e-mail
message in error, please immediately notify the sender and permanently
delete the original and any copies of this email and any prints thereof.
ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS
NOT INTENDED AS A SUBSTITUTE FOR A WRITING.  Notwithstanding the Uniform
Electronic Transactions Act or the applicability of any other law of
similar substance and effect, absent an express statement to the
contrary hereinabove, this e-mail message its contents, and any
attachments hereto are not intended to represent an offer or acceptance
to enter into a contract and are not otherwise intended to bind the
sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any
other person or entity.


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