The "range" LED will light if there is no clock.
The 10 MHz clock I guess is isolated via T2, divided by SN2 and level shifted by Q3/SN1. All looks OK, and I get a good "E" clock which is derived from the EXTAL input.
Anyway I seem to have a partial success
I hooked up the last few channels of my logic analyser to SN9/SN11 5V supply, ROM1 CE, ROM2 CE, ROM1/2 DE and the ROM 5V supply and
The signal generator boots up perfect every time, and doesn't lock up!
I will have to leave it for tonight, but tomorrow I will try and find out why connecting the logic analyser makes it work.
pods state 200 KΩ by 3 pF so will have little effect on the logic, but obviously enough to change the timings!
Will keep you informed of what I find.
Peter