Harman Kardon PM665 No Phono
I'm helping an older couple sort out a few problems with their Harman Kardon system. Quite a few months back I took each unit, de-oxed it, opened things up, and just gave things a general look over to see if there were any serious issues. Luckily it was all stuff anyone could do at their kitchen table. I put it all back in their home, hooked everything up, and everything worked great!
Just last month the owner said the turntable pooped out. I checked it out, took the cartridge home to try and it worked fine. I took another turntable over I worked on to try, and it too produced no sound.
I tried running the radio and tape player through both Phono Input's and still got no sound. I checked and double checked all my connections and selector switches, tried pushing all the buttons a few times, rolled the selector switches a few times just work out any oxidation that may be there. Still nothing.
Did these units have common problems with the pre-amp or is there a fuse or fuses blown inside? I find it kind of odd that everything worked fine for several months and then up and dies one day. Everything is on a surge protector and everything else works just fine except for this function.