Ed, your problem may be due to dewet around the knee.  Check to see if your
voiding is around the circumferance of the PTH.  Do some microsections on the
defects and see if they don't orginate from this area without any copper
voiding.

                                Regards,

                                Jim Reed, Texas Instruments, Austin, TX

Voice = 512 250-7172,  
Fax =   512 250-7967,  
Email = [log in to unmask]
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------------------
Original text

From: gabriela <[log in to unmask]>, on 4/6/96 10:10 PM:
Ed Gavin wrote:
> 
> Trying to elimenate pinholes(many) and blowholes(some)
> 
> Situation:
> Through hole technology, 0.062 double side PCB
> OA 20% solids flux, .905 spec gravity
> Wave Temp - 500*F  Preheat top side temp of 190*F
> Speed 4.5 FPM
> 
> Have tried baking 215*F for 2 hours
> Have microsectioned board, copper in holes looks good
> 
> Believe some components could be contaminated, could this cause the
> condition?
> Looking for suggestions
> 
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If components are contaminated,you should find the defects at the same
locations on the board.Maybe your board is contaminated.
Try to visually examine your boards for organic contamination and run
some bare boards through tht wave.
Gaby

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