Hot day, heavy laser work going on (1/4" acrylic which is hefty for a 30W laser).
Rapid beeps - "laser thermal error". Machine does not want to cut, so I recycled it.
Laser now cuts at half power for 2 mins, then drops back to marking only.
So I decided to take it apart and see what was up.
synradF30.jpg
A coil had overheated and fallen out of its PCB location. I soldered it back in, and touched up the ugly-looking solder on its twin. Laser is now, at least, back to full power. This repair does require a really good soldering iron as the PCB is thick copper and the coil is hefty. And remember, these things are dangerous. I have more photos of the RF board if anyone wants to see them. BTW, that transistor is $65.