They could have used a selective soldering for the through hole but this is a rather slow process if this is a high production board. Most likely they used a pallet that masked the QFP's from the solder waves but left open the areas where the through hole components are. This is getting to be very common and works well if the pallet design is done correctly. Ken Kirby Wavesolder Product Specialist Speedline (Embedded image moved Jorge Engenharia <[log in to unmask]> to file: 06/14/99 08:28 AM pic16399.pcx) To: [log in to unmask] cc: (bcc: Kenneth Kirby/ElectrovertUS/Cookson) Subject: [TN] Manufacturing process Hi techies, I received a board sample that probably we could assembly here, but I had one doubt about the manufacturing process. The board is a VGA card and has trough hole and SMD components at top side and 2 QFP 100 at bottom side. The 2 QFP had no glue attaching the components and were not soldered by solder wave machine, but all trough hole components were soldered. The question is : The 2 QFP were covered with solder mask and passed to the solder wave machine ? Or they used selective solder to avoid contact with the 2 QFP ? Or there are other ways to assembly this kind of board ? I am trying to figure out how they assembly this board, I am not familiar with this kind of assembly. Any input will be apreciated. Thanks Jorge Dourado de Santana Maintenance / Process Engr Microtec - Brazil ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################