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March 1997

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Subject:
Re: Assy: Blowhole(reply)
From:
"LANmark Circuits,Inc." <[log in to unmask]>
Date:
Wed, 5 Mar 1997 06:21:32 -0800
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At 07:31 PM 3/5/97 +0800, you wrote:
Poh,
Baking should have at least helped the problem.  You might try baking
at a higher temp. (150 deg. C or 300 F)

You should also ask your board vendor what method of hole sensitization 
they're useing. (Electroless copper, Carbon, Graphite?)

Good Luck.....John

>I have a serious problem on some of the board that stucked in the store.
>All of them is at least 2 years.
>When I  wave-soldered the bare board, it has a lot of blow-holes, solder
>balls, pin-holes.
>
>Anyway, I try to purge all of them, but there are 6000 pieces in the Store.
>
>I try to bake at at 100 deg. C for 4 hours. Too bad, it doesn't work.
>
>I try to bake for any 4 hours just before wave-soldering. The result is
>terrible. Not even a slight Help !!!
>
>Can anybody give me some advises what should I do ???
>
>Thanks in Advance
>
>Poh ..
>
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LANmark Circuits,Inc.		
400 Crown Point Circle
Grass Valley,Ca. 95945
(916)272-7280(voice)
(916)272-7017(fax)

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