On Saturday 05 December 2020 18:49:24 Karl Schmidt wrote: > On 12/5/20 5:34 PM, Jon Elson wrote: > > On 12/05/2020 04:49 PM, Karl Schmidt wrote: > >> Most electrical hardware problems turn out to be connectors. > > > > Yes, I can verify this. I've just resurrected a vintage-2000 pick > > and place machine. I had to reseat a whole bunch of connectors, and > > even reseat many socketed ICs (they used a bunch of 68-pin J-lead > > chips to basically control low-speed function boards via serial > > comms). There were also a couple boards that initially worked fine, > > but then failed after a couple days of being powered on. > > Reseating socketed IC's with tuner cleaner paid my rent when I was > younger.. <grin> > > In realestate it is: location-location-location > > For electronic debugging it is: connectors-connectors-connectors...
I've had very good luck pulling all the chips and stirring them around in a china coffee cup full of the stinky stuff called dip and rinse by one brand, but there is a stronger solution in a black plastic bottle that works even better. rinse them off well in running hot water and dry with a hair dryer when they were bright again. I thought I had some in the kitchen, but can't find it now. name is tarn-x or tarnex, something like that IIRC. It doesn't keep well once opened so it may have been flushed. We at one point had a digital video effects generator that spent the first decade of its life in the Penny's tv commercial production facility deep in NYC's polluted air, and all the chip legs were so blackened you could chisel it off with a pocket knife, but this stuff restored the chip legs to bright like new. Some of the sockets weren't that great but I kept it running for another decade. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
