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With the galvos connected - the LEDs on each driver board should turn green after the power is turned onON.
The driver boards are arranged in the order
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An offset is applied to Y1. This offset is tweaked using the front panel 10 turn pot.
Y2 is spec'd for M40.
Y1 and Y2 are coupled through a GAIN that is determined by a pot which is accessible through a pot on the front panel.