I modified the DT40 AMPs per Pangolin specs, made sure the wiring to the galvos is correct, set the DC offset to zero, turned the servo gain 7 turns clockwise for zero, plugged them in and got an acceptable ILDA pattern. Great. A little tuning and I'm all set. Then I blew the power supply when a small shard of aluminum got between a resistor and a cap. OK, no problem, I got a new 24 volt power supply plugged it in, set the DC offset back to zero, plugged the galvos and got a Y oscillation. Tried backing off the Low Freq Damping, but that did not work. Tried turning down Input Gain, no help. Now the ED1 green LED goes out when either galvo is plugged in. They go back on when both galvos are unplugged, so the boards seem to be fine. I've only touched the Position Scale , Servo Gain, Low-frequency Damping, High Frequency Damping, Input Gain and Input Offset. What I need is a recommend starting point for all these pots for the 506 scanners (3mm mirror). I do not have a scope, just a decent DVM.
Thanks for any help.