Circuit board TRSQW3 in EWM Stick 200H

OP #7778265

Hello, I have faulty EWM Stick 200H welding with circuit board TRSQW3. Maybe someone have any clue, what does LED "POLA" mean? On board besides this one, there is also "EL.", "STRSTP", "+15V, "-15", "+5V", but I guess the are not so important. I just want to understand what direction to dig. This board seems is not very popular and not much documentation.

-Peter

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OP

Hello, answering on my own post. :) Seems "POLAR" mean polarity. After redrawing some part of board I fixed it. Reason why there was no power on output was R7 resistor on TRSQW3 went from 1kOhm to few giga-ohms.

-Peter

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