@tubetime got something bigger to hold on to and also electrical connections for measuring. this way they maybe also compensate for variance in the production process

@tubetime Woah... that's a thing.

@tubetime Huh? On a power supply board? What sub-circuit are these resistors part of?

@tubetime VR3 - variable resistor? Are those fine tuned via the laser?

now i am repairing some more vias. the capacitors leaked and etched out a bunch of vias. this one needs to be connected on layer 2, so i had to remove some copper pour and FR4 to expose the trace.

@tubetime I'm guessing they trimmed to tune the system as a whole, not just the single resistor value?

@tubetime My first job out of school was doing fpga stuff at a company that did laser trimming. It was wild. They used analog circuits to drive the galvos which had the mirrors. If the circuitry was off by a bit, you could see the “ringing” of the circuits in the right angle cuts (instead of an angle you’d see a little degrading sine wave). I’m still convinced analog EE’s are wizards.