We have had the same problem over the last year or so until we required our 
board manufacterer to do open and short testing on the board prior to shipment 
and we always do solderability testing prior to assembly.  The open/short 
testing has eliminated most of the problems be use to have at the assemblers 
facility. 

______________________________ Reply Separator _________________________________
Subject: Defective PWB at customer's facility
Author:  [log in to unmask] at _internetcc
Date:    2/26/97 2:34 PM


 Good morning Techneters,
     
 We have been finding defective PWBs from time to time.  The defect 
 rate is not alarming all the time, however it seems like there is a 
 small number of defective PWBs are coming in (steadily) with various 
 defects, such as, open or high resistant via, open trace, poor 
 solderability, etc.
     
 My question to you is, "Is there some percentage that is typical for 
 escaping defects out of a fab house?"  I know ideally it should be 
 zero.  What is your experience?
     
 Thanks in advance,
 Paresh Patel
 Mfg. Engr.
 Oneac Corp.
 847-816-6000 x-704.
     
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