TECNOSOL welding mashine problem

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pasicr

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Hi for all,
I have problem with Tecnosol Minitec 140,
can not regulate the output welding power (current), mashine work with maximum power,
can somebody share with me schematic from this welding mashine or share with me advice what is the problem?
The main potentiometer for regulation is Ok, that is 4K7,
thanks in advance and
best regards
 

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