I'd be remiss if I didn't mention this fantastic service manual. This monitor is a relic of a bygone era, where things were built to last, and built to be repaired.
Block diagram. Theory of operation for every major circuit. Clearly drawn and printed schematic diagrams. Oscilloscope waveforms. Photo of the PCB with all the components indicated. The PCB has positions and polarity screened on the top and bottom.
It's just lovely to see the amount of care put into this. It's why this is still working, 43 years after it rolled off the line.
If I ruled the world, I'd require everything to have this level of documentation and repairability.
https://arcarc.xmission.com/PDF_Monitors/Motorola%20M5000%20&%20M7000.pdf