I have some old devices like SMPS power supplies, and I would like to analyze their workings by first drawing a circuit diagram of them.
I'm looking for some tips/techniques for doing this. Should I first draw all components of the circuit, then find out which ones are directly connected to each other by using continuity setting on my multimeter, and then try to figure out the values of individual components? Is there a good general guide/procedure for this?
Assume that the diagram of the circuit is not available online or anywhere else, I want to be able to build it on my own. Also, I'm looking for techniques for doing this in general, without having assumptions of the workings of the circuit beforehand. I'm mentioning SMPS as just an example.