This seems to be the place to discuss corrosion troubleshooting/repair for these boards, so here goes mine -
I've got a 16750B that had some corrosion (I removed the runners and cleaned everything up), and was failing quite a few self tests (Analyzer Chip Memory Bus Test, System Clocks Test, Analyzer Memory Bus SU/H Measure, Comparators Test, Zoom Acquisition Test, and Zoom Chip Select Test). I repaired about a dozen corroded traces, and have everything passing except the Zoom Acquisition Test, and Zoom Chip Select Test.
Does anyone have thoughts on Zoom failures? Comparing the non-Zoom 16715 to the boards with Zoom, I think the Zoom circuitry is the 5x 1NB4-5040 chips, and a couple other chips nearby. I've inspected the areas around there very closely for corrosion under the microscope, as well as checked continuity anywhere I've seen anything suspicious looking... but haven't found anything.
Below is the output from pv (d=9, r=9). It looks similar to the failure from this thread:
https://www.eevblog.com/forum/testgear/agilent-16717a-comparator-and-zoomchipseltest-failures/ , though I'm not sure that was ever resolved. From reading the log, it looks like maybe FISO #0 is working, but #1-#4 aren't (there's at least one FISO failed message for each, except #0). The 0x8088, 0x888, and 0x808 regardless of expected data sorta gives me the feeling of a floating bus, like the chip isn't getting selected (especially since it's failing the chip select test).
I'm guessing nobody knows which pin is the chip select, or where it comes from, right?
I guess if everything except Zoom works on this board, that'd still be usable... but of course I'd rather fix it if I can.

pv> x zoomAcqTest
Slot A: FISO 4 - Data Bits Stuck HIGH: 0xf7
> Slot A: Zoom Acquisition Data Lines Test Failed!
Slot A: FISO 3 - Data Bits Stuck LOW: 0xf3
Slot A: FISO 3 - Data Bits Stuck HIGH: 0xf7
Slot A: FISO 2 - Data Bits Stuck HIGH: 0xf7
Slot A: FISO 1 - Data Bits Stuck LOW: 0xf7
Slot A: Chip9: edgeCount=1623, exp=811
> Slot A: Chip9: Zoom Acquisition Data Frequency Test Failed!
Slot A: Chip8: edgeCount=0, exp=811
> Slot A: Chip8: Zoom Acquisition Data Frequency Test Failed!
Mod A: TEST FAILED # "zoomAcqTest" (4, 4, -1)
pv> x zoomChipSelTest
Slot A: Filling FISOs for Pods #1 with zeroes...
Slot A: Checking FISO #4...
Slot A: Checking FISO #3...
Slot A: Checking FISO #2...
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Actual = 0x8808, Expected = 0xadff
Slot A: FISO #2 failed.
Slot A: Checking FISO #1...
Slot A: Checking FISO #0...
Slot A: Filling FISOs for Pods #2 with zeroes...
Slot A: Checking FISO #4...
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Actual = 0x888, Expected = 0xffff
Slot A: FISO #4 failed.
Slot A: Checking FISO #3...
Slot A: Checking FISO #2...
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Actual = 0x8808, Expected = 0xdaff
Slot A: FISO #2 failed.
Slot A: Checking FISO #1...
Slot A: Checking FISO #0...
Slot A: Filling FISOs for Pods #3 with zeroes...
Slot A: Checking FISO #4...
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Actual = 0x888, Expected = 0x5aad
Slot A: FISO #4 failed.
Slot A: Checking FISO #3...
Slot A: Checking FISO #2...
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Actual = 0x8808, Expected = 0xffad
Slot A: FISO #2 failed.
Slot A: Checking FISO #1...
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Slot A: FISO #1 failed.
Slot A: Checking FISO #0...
Slot A: Filling FISOs for Pods #4 with zeroes...
Slot A: Checking FISO #4...
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Actual = 0x888, Expected = 0xadda
Slot A: FISO #4 failed.
Slot A: Checking FISO #3...
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Actual = 0x808, Expected = 0xad5a
Slot A: FISO #3 failed.
Slot A: Checking FISO #2...
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Actual = 0x8808, Expected = 0xff5a
Slot A: FISO #2 failed.
Slot A: Checking FISO #1...
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Actual = 0x808, Expected = 0xffff
Slot A: FISO #1 failed.
Slot A: Checking FISO #0...
> Slot A: Zoom Acquisition Chip Select Test Failed!
Mod A: TEST FAILED # "zoomChipSelTest" (1, 1, -1)
I also have a 16533A that sometimes passes some or all tests, and sometimes fails some or all tests. I pulled the runners, though didn't see any corrosion that looked like it needed repair. I haven't dug into this one at all yet (plan to double-check for corrosion), but if anyone's got tips to check for this one, I'd appreciate it as well.
Thanks,
DogP