I'm happy to report the FT-857D is back on the air and working properly along with the MFJ-939 ATU.
I'm still at a loss to explain why the fuse opened which is worrisome. I also don't understand why the blown SMD fuse keeps CAT from working. Looking at the schematic that fuse seems to only be for the 13.8 power out.
I am grateful to everyone that offered suggestions.
Sincerely,
Mike / KA4CDN
