Preheat the pcb.  It will reduce the temp and dwell of the iron on the pad.
Also make sure the iron tip is appropriately sized (geometry).



Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Dworak
Sent: Thursday, January 25, 2007 3:01 PM
To: [log in to unmask]
Subject: [TN] Assemble question

I am in need of some help with regards to assemble. I am a PCB manufacture
and have built a group of boards for one of my accounts and they are having
issues assembling and have asked me for help on the issues they are having.

 The product is 4 layer board power and ground planes with 2 OZ copper inner
layers the outer layers are 5 OZ copper. What is happening is that because
of the construction of the board it is acting like a big heat sink and this
is where the problems are coming from. These are old through hole designs
they are assembling them by hand they are heating the irons way up causing
surface issues on the boards and in some cases lifting of pads is resulting
when extreme heat is applied they are heating them up a lot because of all
the copper and as I am being told the solder is not melting the way that it
should. 
 Any suggestions to make this a smooth build ? 
 Thank you. 

Bill Dworak













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