I'd strongly suggest you have a good overhead camera rig, with lighting, so that you get well lit stable video and stills from above. If you're doing video, mak

I'd strongly suggest you have a good overhead camera rig, with lighting, so that you get well lit stable video and stills from above. If you're doing video, make sure you've got a good microphone so people can clearly hear you. Back in the 1980s, I repaired industrial electronics for which there was no documentation that was at least 25 years old. I did a number of 480 volt, 3phase, 100+ amp SCR packs. I'd use a legal pad and a mechanical pencil to sketch all the parts, making sure I included ALL of the wires, etc. as I went. I'd disassemble, and keep checking to make sure the parts were in the sketches. I'd then clean the whole thing, and start re-assembling, replacing defective parts as I went. Eventually, I'd have the whole thing together again, make any adjustments and/or tests, and it would be good to go. These days, I'd take good photos, with multiple views, of everything, but I'd still be tempted to sketch everything, because if you're additively making the image, instead of just annotating it, you can't skip anything. I'd experiment with masking off things from a photo as I labeled them... that might work.