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ARICIU2009

awelco defect

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o intrebare pentru cei cu mai multa experienta pe invertoare:Am un awelco micro 164 care a mai fost la un meserias si care se aprinde ledul rosu dar nu porneste.Am masurat tensiunea de alimentare pentru uc3845 =15v okU ref pe pin 7 uc3845okoscilatia pe out uc3845 =80 khz ok zic eutensiune pe cele trei stabilizatoare ok respectiv 15v HAUT ,vcc-u2p =15v si 13v .masurat zenerele de pe linga l6386 toate ok.masurat u pin4 l6386 =15vmasurat vboot =15v am oscilatie de 80khz la iesireIgbturile masurate si nu-mi dau nimic...mai ramine sa le incerc sub tensiune sa vad ca se deschid.placa de forta curata...nu am masurat rezistentele din emitori igbt pentru senzor curent dar le voi masura injectind un curent constantpe iesire secundar o dioda dubla scurt pe o ramura.. meseriasul a lasat-o in aer...intrebarea mea este ce tensiuni ar trebui sa am pe iesire l6386?..eu suspectez ca l6386 e dus dar vreau sa fiu sigur...

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cam asta este problema lor.se pun in scurt cele doua diode smd STTH30R03CG

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am masurat igbturile sub tensiune si isi fac treaba.am masurat si rezistentele de 0,100ohmi din emitor igbt si sunt ok...alte sugestii?

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