It's alive - sort of. I had to perform quite a bit of surgery on the guts. I found that the mounting posts on the big board that attaches to the right side RF module had broken loose from the board, and a board edge connector socket on it that joins the back interface cluster board, was split down the middle. The posts were easy to tap through and put screws in from underneath, then I straightened out and realigned all those %^^*% long inter-board square pins.
I didn't have the right kind of board edge connector in stock to replace the busted one, and I was concerned about removing all those socket pins from this multi-layer board, so I opted to put a steel band around the socket housing, which drew everything back in pretty well.
The front casting did have some cracks in the skimpy areas, and I couldn't flatten it out quite right without risking major fractures, so it still has a bit of concavity. The front plate did flatten out OK, so it looks good assembled, even though the casting behind it dips inward. I put it all back together sufficiently to plug into a mainframe, but it's still a little (and too much) out of square, so will need more mechanical tweaking.
I plugged it in and fired it up, and it immediately crashed the mainframe. I figured a bad Ta cap somewhere deep inside was the problem. However, forcing the right side of the plug-in in deeper made it come to life. So far it has most of the readouts and knob functions indicating, and a baseline, but apparently no video signal. The sweep time/div readout is stuck at "500 kHz" regardless of the knob position, although there's evidence that the actual setting is doing something inside. I'm next going to loosen up the back end rail mounting screws so there will be a little more play side to side, and hope that getting deeper engagement on the right will fix the remaining problems. If not, it could be that I missed or connected something wrongly on assembly, or knocked something loose, or it already had a fault, etc. I'm happy that at least it lights up though.
Ed
