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Forgot to give you a good reference that I read myself up and then to
keep old brain updated. With this article you learn a lot about the
PTH conditions! Professionals in this forum may smile and see this as
college lab instructions, but for us as amateurs, it's worth reading.
http://www.thinktink.com/stack/volumes/volvi/copplate.htm#swish
Good Luck!
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Ingemar Hernefjord
Skickat: den 30 november 2005 00:18
Till: [log in to unmask]
Ämne: [TN] SV: [TN] Via Cracking in flex cable
Hi Mumtaz,
My reaction is that there seems to be no hole stiffeners.
And the barrels are not uniform.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Mumtaz Bora
Skickat: den 29 november 2005 05:02
Till: [log in to unmask]
Ämne: [TN] Via Cracking in flex cable
Dear All,
We have an issue with flex cables cracking in cellphone
assembly. X-sections are showing voids, some residue and cracking in
the
via. It appears to be a combination of smear remove and copper plating
problem. Any insight from the flex circuit and plating experts will be
appreciated. I have asked Stephen Gregory to post the X-sections on his
website.
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
San Diego, Ca 92121,USA
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