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Convertizor Tip VAMM 50 90 de Electrotehnica


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Buna ziua , cine ma poate ajuta cu manual de service, schemele electronice la modulele aferente convertizorului,  pentru acesti convertizori, am intampinat o problema la modul de alimentare adica la modulul  VAMM-A2.



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Am verificat tranzistorii de putere 2n3055 sant buni ,condensatoarele de filtraj de 1500uF/40v toti trei masurati direct pe placa imi arata la 1200uF,transformatorii OK, problema este aceasta sursa  , am schimbat alta sursa si functioneaza convertizorul ,dar cu aceasta placa defecta de sursa  nu imi da OK la convertizor,,, este foarte multa munca la aceasta placa de alimentare fara scheme etc , si mai ales ca nu o pot alimenta singura placa .



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Pai vad ceva electrolitici mai mici pe acolo si vreo 6buc A723 ... asta ar insemna cam 6 surse de alimentare?

Eu as verifica si electroliticii mici, eventual scoase a723-urile si testate separat, montate socluri la ele. Acum depinde cat efort vrei sa investesti. Ultima chestie ar fi ridicarea schemei de mana (fiind dublu placat).

La fel de bine daca ai loc in aparat masori tensiunile/riplul surselor respective pe placa functionala alimentata si apoi in aceleasi puncte pe placa stricata cu conditia sa nu propagi defectul si in etajele urmatoare ale convertizorului.

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