Hi ! Every one.
Few weeks before I bought 2.5W Laser Engraver in Banggood. The Controller board has no mark, I think it is L7 (see attached photo). I used PS to created a test scale bar, and using V.08(default setting). I setting is Low In=0 or 16, Max Int=100 or 255, Speed=800, Time=5,7,10
All combination not work, only engraving black/white at all, no scale. Then set v.09, still only black/white.
I question is, does this controller board PWM or VFR available? How to set them? or have some firmware to upload?