Suzanne,

Sound to me that may be your supplier reworked some of the parts or during
the solder mask process some of the panels did not get properly surface
treated or sat too long. Whenever some of the parts have problems it is
normally the process or something in the process that is not controlled
properly or that some of the parts saw something different than did the
others, i.e. reworked. It sounds to me that your supplier is more interested
in finding fault with something that you are doing, then he is in finding
the root cause. I take it that he has seen your fluxed boards before making
suggestions that there was not enough.

Can you see anything different in the appearance of the parts prior to or
after processing? Have you tried to tape test the parts before assembly?

Scott B. Westheimer

Colonial Circuits
----- Original Message -----
From: "Suzanne Foulkes" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 09, 2004 12:09 PM
Subject: [TN] Solder Mask Flaking


I know this was up for a discussion a few weeks ago. Can anyone tell me
what the root cause was determined to be?

 I am experiencing solder mask flaking on a group of boards manufactured
by one certain supplier. It is a random occurrence for example 10 out of
the 100 boards we had this occurr. Then a different board we ran 8 out
of 40 were flaking same supplier as previous one.

Supplier runs samples at his facility and he see's no flaking. We
changed our solder temperature from 500 degrees to 450 degrees at the
suppliers suggestion and flaking still occurs. He then states maybe were
not using enough flux but review shows plenty of flux if anything maybe
were using to much flux from the way the boards look coming out of the
wave and washer.

Thanks
Sue Foulkes
QA Manager
AESCO Mfg.



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