OK... The SLP1200B is no longer dead. I have replaced a 5V reg and a minifuse (soldered on fuse), which has brought *most* of it back to life. Everything now appears to look right, all switches LEDs light, display lights correctly - but, pressing play results in a big fat nothing.
I'm wondering if there are further ills further down the power supply chain as its a bloody complex bit of kit! I have diagrams for an SLP1200 / 1200KEK which I believe are the domestic versions. The one I have is apparently the broadcast version. The displays fill most of the upper panel, and there's a few more seek and cue options. Trouble is, most of the boards are subtly different, so I'm kind of flying blind on this one!
I could be some time!
The 770's are working beautifully though! Now very comfy in my listening room
"Two very small men cutting steps in the roof of the world"