TECHNET Archives

August 1999

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Phil Dutton <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 20 Aug 1999 09:27:23 +0900
Content-Type:
text/plain
Parts/Attachments:
text/plain (56 lines)
A bit of a wild guess. How are you storing the material? Could there be a
humidity problem
in your short term storage? I would imagine that HASL would highlight any
moisture problems.
Phil.
At 15:25 19/08/99 -0500, you wrote:
>    Here's one for you guys, and  gal's.   We are witnessing measling  in
>sporadic fashion.   It usually occurs along the  edge of the panel,
>sometimes encroaching on the boards, sometimes  not.   We have already
>contacted  our supplier, for their huh hum, expertise.   We pulled and
>reviewed again, all process  records. There has been no change in the
>process. Verification and calibration  records reflect proper equipment
>function.   This is happening with 7629 pre-preg in 12 x 18  and 18 x 24
>sizes   We had pulled the material  with the same lot number, the problem
>went away just as  quick.   Well, it repeated itself a  week or two later,
>again we switched to a different batch of material, the  problem went away.
>  With the supplier on-hand, we laid up a book using pre-preg  from the
>batch we had earlier observed measling from, as well as from another
>batch, there were not any measles observed, we repeated this, and again
>there  were measles.   We went back to the process, re-checked everything,
>still no  significant changes.   Our supplier has been in-house for three
>days running  experiment's, they even brought someone in to assist him,
>they are just as  puzzled.    Samples have been sent to Microtek Labs for
>their  analysis/opinion, no response so far.   Just wondering, does anyone
>out there want to take a shot at  this one.   Thanks,   Franklin D Asbell
===============================================================

Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer
Vision Abell Pty Ltd
Second Avenue, Technology Park,
Mawson Lakes.  SOUTH AUSTRALIA  5095

Phone :         (08) 8300 4400 (reception)
                (08) 8300 4481 (direct)
Fax :           (08) 8349 7420
email:          [log in to unmask]
Internet Page:  http://www.vsl.com.au

===============================================================

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

ATOM RSS1 RSS2