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Tue, 9 Dec 1997 11:26:24 +0800 |
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At 10:23 PM 1997/12/7 EST, you wrote:
>Assuming your developing process is in spec, soldermask residue is indicative
>of too high a temperature at tack cure; overexposure could also cause the
>problem.
>
>Where is the residue? Is it on the fiberglass or the copper or both?
>Give me your process parameters and I'll try to help.
>
>Mark Dowding
>Regional Technical Service Manager
>INSULECTRO
>
Our Process Parameters as follow : -
Pre Heat 15min for first side, 30min for second side, temp. 72 +/- 3degreeC
the residue was occured on the surface of the gold, especially on the edge
of the hole,
also, the Stuffer Step is 10 - 12.
By the way, all the parameters we have used for more than one year.
Please advise
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