few tricks may help: (1) use Lonco flux to activated your PWB before wave (Lonco=pink water soluable flux can eat your forks for lunch). Make sure you clean the PWB on time with the neutralizer and hot water.... (2) as suggested by others, bake and wave immediately. A lot of problem with the old design is that process changed in late 80s: (1) eliminate CFC ==> can not use RA flux (2) cost cutting ===> use FR4 instead of polyimide board ==> can not go high temperature wave (3) cost cutting ===> use non-mil temp range components ===> can not go to high temperature wave (4) cost cutting ==> use non-nitrogen or low grade nitrogen and/or shorter preheat zone (cycle time improvement)... (5) others...(you want to know? no, no, you do not really want to know...). It is sad you find out on production line...someone (designer) should spot it...(back to Brain's point of concurrent engineering...with the fast turn around workforce...you may have difficult time to "concurrent"...copycat without true knowledge is scary in design...)...(i think i better shut up before someone kills me)... jk At 10:20 AM 8/16/00 EDT, you wrote: >In a message dated 08/16/2000 8:44:10 AM Central Daylight Time, >[log in to unmask] writes: > >> We usually wave solder the easy components, clean, apply the heat sinks, >> clean again, bake, and hand solder the toughies. Would a rework station be >> any help? That's a guess, we're looking at getting a mini-wave system next >> fiscal. >> >> How ancient - 70's, 80's, or early 90's? >> >> Hans > >Hi Hans! > >Wish I could that, but the heatsinks are bonded to the top of the boards and >cover the entire surface of the board, except where the barrels are for the >components. Then you install the components straddling the heatsink...they >don't make it easy brother! > >-Steve Gregory- > >############################################################## >TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional >information. >If you need assistance - contact Keach Sasamori at [log in to unmask] or >847-509-9700 ext.5315 >############################################################## > ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################