I have seen some 847 with the same problem, and there's a common thing, they all where using some interface for FT8.
Maybe an excesive audio or impedance problems, I dont know, fry something related to the modulation stage. There is a carrier, algo works in 2m, but in HF is gone, so SSB obvioulsy wont work. Have a tech friend with 3 847 with the same problem and cant proceed properly because cant find a decent service manual. Any help will be appreciated.
