[stevehertz]

I presently own a couple of 650s and have always found these sets very difficult to work on due their cramped, boxed in layout and conjoining wires. Another one I worked on for weeks and eventually gave up on it. But once working they truly live up to their description as the best sounding multi band portable ever made, bar none. Congratulations on winning your battle!

From my experience the most important faults to look for are dry joints on the main board (you often cannot see them, but they're dry) and dirty pots and switches. Sort these out first.