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September 2005

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 16 Sep 2005 06:28:12 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (200 lines)
I haven't woke-up yet, strike that last question.

You said you already recieved the boards...
so you would know if you got new ones or not.

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX




                      Stephen R
                      Gregory/LABARGE@L        To:       [log in to unmask]@SMTP@Exchange
                      ABARGE                   cc:       (bcc: Stephen R Gregory/LABARGE)
                      Sent by: TechNet         Subject:  Re: [TN] Rework for Delaminated PWBs
                      <[log in to unmask]>


                      09/16/2005 06:16
                      AM
                      Please respond to
                      TechNet E-Mail
                      Forum
                      <[log in to unmask]>
                      ; Please respond
                      to Stephen R
                      Gregory





                                Mornin' Everybody!

                                I have the pictures that Mumtaz sent me
posted now. Go to:

                                http://www.stevezeva.homestead.com  and
click on "Picture Page 2"
                                and look at; "Blister 1, Blister 2, After
Bake 1, and After Bake 2".

                                Boy, that's some SERIOUS delamination! I
don't know enough to say
                                if the rework that your supplier is
proposing is acceptable, but my first
                                question would be is why would they send
you boards that are not cured?

                                If they sent you boards that are that
undercured, what else is wrong with
                                these boards?

                                I would have a very hard time accepting
these boards. Which brings up
                                another question, if you say you won't
accept them and that you want new
                                boards, how will you know that you won't
get the same boards that your
                                supplier has "reworked"?

                                Kind regards,

                                -Steve Gregory-
                                Senior Process Engineer
                                LaBarge Incorporated
                                Tulsa, Oklahoma
                                (918) 459-2285
                                (918) 459-2350 FAX





        Mumtaz Bora <[log in to unmask]>
                        Sent by: TechNet <[log in to unmask]>
                        09/15/2005 08:20 PM
                        Please respond to TechNet E-Mail Forum
<[log in to unmask]>; Please respond to Mumtaz Bora
<[log in to unmask]>

        To:     [log in to unmask]@SMTP@Exchange
        cc:     (bcc: Stephen R Gregory/LABARGE)
        Subject:        [TN] Rework for Delaminated PWBs


                                Dear Technetters,


                                We have received a large batch of PWBs that
is showing delamination after
                                reflow at peak temp. 230C. Laminate is high
Tg - 170C.

                                Supplier is proposing to perform the
following rework -- on these boards
                                instead of providing replacement parts.

                                  Oven bake at 190C for 2.5 hours followed
by second bake at 150C for 2
                                hours at 6kg/cm2 pressure. Will this
guarantee a full cure?

                                I am concerned about latent failures and
layers opening up as full cure was
                                not achieved the first time.

                                Any inputs from the forum will be
appreciated.

                                I will request Steven Gregory to place the
image of delamination on his
                                website.  Have a great weekend.
                                Thank-you

                                Mumtaz

                                  D/ 252 - SMT Process and Component
Quality
                                  Bldg. V238E
                                Voice  (858)-882-1967
                                Fax    (858)-882-3126
                                Page  (858)-635-1180
                                Cell:   (858) -449-7054
                                email: [log in to unmask]
                                Kyocera-Wireless Corp.
                                10300, Campus Point Drive


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                                San Diego, Ca  92121,USA




__________________________________________________________________
                                This message may contain information that
is privileged and confidential to LaBarge, Inc.  It is for use only by the
individual or entity named above.  If you are not the intended recipient,
you may not copy, use or deliver this message to anyone.  In such event,
you should destroy the message and kindly notify the sender by reply
e-mail.

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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------



__________________________________________________________________
This message may contain information that is privileged and confidential to
LaBarge, Inc.  It is for use only by the individual or entity named above.
If you are not the intended recipient, you may not copy, use or deliver
this message to anyone.  In such event, you should destroy the message and
kindly notify the sender by reply e-mail.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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