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What ground do I use, the chassis, the removed connector, of the Mains ground?
For something like this, I setup the bench power supplies using a floating ground. I use multiple supplies (in series) to get the voltages needed. Googling something like “lab power supply grounding” will get you a better explanation than I can provide as well as providing safety tips and identifying pitfalls.
I am attaching photos of the different boards and spots. Am I correct, the error is on the PCB?
The markings on the PCB might be a bit misleading, but are actually correct. If you look carefully, the small resistor is connected to the large green one via the traces on the circuit board. Clipping the test leads on the green resistors is the most convenient location. The positive lead goes on the right resistor if I recall correctly.
Glitch