Hi everybody,
I bought a chinese laser machine lxj1390 and just while doing the first test cutting a 3mm of acrylic for two minutes i heard a pop and the laser stops emitting. I checked the laser power supply, and i found that the fuse is burnt. I changed it with piece of aluminum foil just to test thinking that the problem is in the fuse( a spare fuse was not available). As soon as i released the emergency switch a loud pop electric sound like arcing. So i push the emmergency swith immediately. I inspected the laser power supply and two transistors 2sc2625 were blown and maybe a 0.22ohm resistor. The ampermeter doesn't exceed the 10ma before the problem.
Please did someone face such a problem and what might be the cause for the power supply to be blown.
Best regards and thx in advance