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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