68kMLA Classic Interface
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| SE/30 recap, there goes UE8 | |
| Posted by: hideehoo on 2018-01-17 23:42:27 Since I need to wait on RAM chips for the 128K, I figured I would work on one of my extra nasty SE/30 boards. LOTS of corrosion from the leaky caps. No problem popping them off with the hot air station, pads cleaned up fine. 30 minute of vinegar and a toothbrush got most of the fuzzy off, but the video area is still pretty nasty and UE8 popped off. I'll try another soak and scrub in that area, but at this point might to worth just proactively replacing all those chips? Any tips for retinning the pads? Feels like I'll need to hit them with light grit sandpaper of something, to much corrosion for even fresh flux to deal with. Also, any gotchas when ordering new logic chips? Schematic says 74LS166. Looks like this should do the job. https://www.mouser.com/productdetail/texas-instruments/sn74ls166ad?qs=sGAEpiMZZMtsbn1GaJysl8drSYt3ukOhxRl7aLOSxWU%3D  | |
| Posted by: bibilit on 2018-01-18 00:01:27 Be careful, don't use sandpaper, pads can be easily lifted. | |
| Posted by: PB145B on 2018-01-18 00:34:49 Definitely DO NOT use sandpaper! As you could easily damage the traces, pads and/or solder mask. Try some solder wick and more flux. | |
| Posted by: techknight on 2018-01-18 04:15:50 add flux, use controlled soldering iron, and use desoldering braid. | |
Posted by: hideehoo on 2018-01-18 20:20:29add flux, use controlled soldering iron, and use desoldering braid.Ya, I had already been through three cycles of flux, solder, braid, IPA scrub in that photo above. Top pads and a few of the bottom ones cleaned up fine, it's just a couple of the really corroded ones nearest the cap being stubborn. | |
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