The bad board had beans for lunch, "bad out gassing problem"! :-)

KennyB

-----Original Message-----
From: Inge [mailto:[log in to unmask]] 
Sent: Monday, August 24, 2009 1:50 PM
To: [log in to unmask]
Subject: Re: [TN] Manual spraying, further qs

This very day, I couldn't stay aside but had to do something to help the 
production guys. So, I took a fresh, naked and qualified board from another 
source and did this:
Put one of our problem boards beside the reference board, both on bottom of 
a larg well box, i.e. no fans blowing, nor any evacuation. Sprayed both 
simultaneosly. Inspected them after one hour at room  temp. The reference 
board was absolutely perfect, while the other was matte! Had a look in a 
microscope. The bad guy had thousands of microscopic inclusions and even 
superficial voids, the reference was perfect. Noticed that the bad boards 
have a much coarser (looks like the net pattern after screen printing)green 
sheet (solder mask) and numerous voids already before spraying. What is your

opinion?
/Inge


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