I've managed to confirm that the sawtooth is running when in auto mode, but it's not getting to the output. Even if I force it to the output, the display is being blanked. I think it's a logic problem, but without any waveforms, or voltages I keep going in circles.
Does anyone in the US have a parts 7B92 I could buy? Swapping some boards, or observing a somewhat working 7B92 would save a lot of time.