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Depanare amplificator ax-1090

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Yamaha ax-1090..

Dupa inlocuirea integratului responsabil cu reglarea biasului (HCA  BA3122n) si a finalilor pe ambele canale, am ajuns la punerea in functiune..

Biasul se regleaza din poturi, insa am urmatoarea problema:


1. Biasul pe canalul stang imi sare cu 4mv pe rez de 0.22, atunci cand actionez pe ON oricare din comutatoarele releelor Speaker A , Speaker B.

Cand decuplez releele imi scade inapoi..

Finali, prefinali ok, masurati in tensiune.

Integratele de bias sunt ok, masurate si intensiune.

Releele si sursele acestora ok, masurate si in tensiune.


Are cineva vreo idee despre ce as mai putea verifica?




Multumesc Anticipat.

Edited by player4
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in etajul final sigur nu e nimic, ca am verificat fara preamplificare si functioneaza perfect... Figura o face doar daca las jumperii pre-out>>>main-in, indiferent daca e activata functia de by-passare a corectorului de ton sau nu

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