Lakoni 900 va welding machine. how to overcome the problems that often occur

Lakoni 900 va welding machine. Said the user does not want on.
  After opening and viewing, r fuse to the 24v power supply block is forfeited.
  Immediately open the power circuit, found r 2.2 ohm broken, broken mosfet and zener 20v in the area of ​​the pcb pwm short.
  Since the 20v diode is difficult to find, give it 12v and 7v5. Replace the components, ui with the rectifier and elko separate first. Measure 24v there.
  Plug it directly into the engine, and on right, ... the relay works and the fan turns. Measure out reads 61 volt.

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