WB, what are your thoughts on what Ionsignal's reported about the 120A hanging on power-up?

Is that indicating a failing self-test?....or some other problem?

Also, in regards to mixer-damage specifically...is that tested for in the diagnostics that are in the 'setup' menus?

thanks!

WB, great reply!......thanks so much. I'm pretty damn sure he told me it passed all those tests on the screen in the 'diags' section of menus. So it's sounding possible that the mixer is good; which would be wonderful. An input-amp sounds easier/cheaper to repair or replace than the mixer. ps; which...

WB, thanks much for your reply. 'legacy'...ahhh...I'll bet that all the links you've posted over the years are still the same, but with that prefix in front of the domain. fyi, there's no link to that 'legacy' section from the 'discontinued' page on the site.....at least not that I could find. Inter...

Wowbagger, thanks much for your very kind offer of help and advice! My younger brother (also a ham, in Mass.) was recently given a non-working IFR COM-120A, and since I have a few decades of career experience in analog design (mostly instrumentation and power-electronics), he's asked for my help in ...