Systron Donner M107 Precision DC Source Repair

This unit was bought faulty, and a few years ago, I was able to get it working on all ranges except the 1000v. But it only worked for a few days before failing again. In this video, I am able to get back to where it was after the first repair, with the 1000v range still not working. If if that can be fixed, I'll make another video about that. It almost certainly needs calibration, but a little more investigation is needed on that point.