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| From: | |
| Reply To: | TechNet E-Mail Forum. |
| Date: | Mon, 16 Mar 1998 08:16:00 -0700 |
| Content-Type: | text/plain |
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======== Original Message ========
Hi!
150 mounted boards wait to be wave soldered.
50 siblings with the same date code already passed the process,but 15%
showed delamination.
The visual examination showed a lack of healthy black colour on the
inner
layer conductors,very different from the state of younger relatives from
the
same vendor.
Age: 4 months.
Number of layers:10
Prebake:none
Previous vendor history:good
What's the verdict for the survivers after soldering?
What should be done with the mounted boards?
Excuse please my nonscientific letter,and try to help!
Thank you,
Gaby
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======== Fwd by: Richard MacCu ========
The "healthy color" you mention, an oxide, may or may not be the culprit.
Find out which process was used because double-treated copper will be golden
not brown. The vendor should be involved since they may not know of any
issues and would want to correct any problems so they can continue to be
your supplier.
Good Luck
Richard MacCutcheon
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