I finally got to get back to this. Some pieces needed to fall in place:
- Get the right Pace tips for SOJ packages
- Get chips from Terra Operative (Thanks a bunch!! )
- Read a lot and watch a ton of Pace vintage videos! A feast in their own right, to be fair.
So I'm half way through the job (though something tells me I may have at best done a third?...) and have removed the suspect chips (207, 208, 214, 216). I welcome any good tips on soldering the replacement SOJ chips. I do have some low-temp Chipquick paste, plenty of syringe-disposing flux, thin regular solder, etc. I do have a hot air tool (cheapo thingie I am not in love with but works OK). I am thinking of cleaning the pads very well (Pace SX-90), be generous with flux on the clean pads, then try to use a chisel tip with careful application of thin solder and run through the pins at deliberate speed. The alternative is to use the Chipquick and the hot air tool, but I have far less confidence I'm not going to end up with bridges and maybe even loose stuff going stray in there. There's some chips in there that get very hot and low-temp solder may get a bit too excited with that in time.