What kind of Solder mask do u have on the boards ?? Try a matty 
finish..its known to be good...if u could get a mix of matty and 
glossy.....that be great....

mohit
______________________________ Reply Separator _________________________________
Subject: ASSLY:X-OUT PROBLEM IN PANELS 
Author:  [log in to unmask] at uucpmail
Date:    11/15/96 11:45 AM


Date : 15/11/96 17:49
Msg From: PROCESS ENGINEERING
WE ARE MANUFACTURING  SIMM MODULES WHICH ARE IN THE FORM OF PANELS. 
EACH PANEL HAS 10 SIMM MODULES( 5X2). ON AN AVERAGE WE ARE GETTING 4 
TO 5 X- OUTS SIMM MODULES PER PANEL WHICH ARE NOT BEING POPULATED. WE 
ARE FACING THE PROBLEM OF SOLDER BALLS IN BETWEEN THE LEADS OF IC's, 
THIS PROBLEM IS RANDOM IN NATURE(i.e IT VARIES WITH NO. OF X- OUTS IN 
A PARTICULAR PANEL.).
WE SUSPECT THAT THIS PROBLEM MAY BE BECAUSE OF VARIBLE THERMAL MASS 
IN THE PANELS. IS THERE ANY WAY OF AVOIDING THIS PROBLEM. ALSO IS 
THERE ANY GUIDLINE FOR THE ALLOWABLE NO. OF X - OUTS IN A PANEL THAT 
WILL NOT AFFECT THE THERMAL MASS OF THE PANEL SIGNIFICANTLY.

REGARDS


AJAY AGARWAL
ALTOS INDIA LIMITED

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