The LO input to the mixer is also dead. It comes into the mixer through a cable/plug and it's still dead while unplugged. There are several test points on the LO circuit . The manual has a few reference wave forms I can check. In summary, both the LO is dead and the mixer's output transformer isn't even passing the basic AF wave by itself. But the transformer isn't open. I'll dive into these over the weekend and see what I can find.
