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imreberes

Onkyo tx-27 defect

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A ajuns la mine acest amplituner defect. La iesirile are 0V respectiv -4V. Siguranta la iesirea de -4V a fost scoasa. Finalul e un STK4843. In afara de stk mai trebuie sa "fiu atent"  si la alte piese. Am stk cumparat de nou din magazin, dar pana acum n-am avut timp de el.

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Acum am masurat din nou: -6,6 si -17 V. Cred ca n-o sa mai masor, ca din ce in ce e mai rau.

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Verifică rez dintre pinii 9-10, reţelele bootstrap dintre U- şi pinii 4, 13. Poate nu e defect total.

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Din pacate a fost. Noul integrat nici macar nu a fost umplut cu rasina.Cand am pus, un canal mergea cam 5 secunde, dupa care a aparut un -41V la iesire. Celalalt canal merge frumos, dar nu l-am testat la puteri mari. Asa ca pot sa-mi iau altul :(

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STK-urile ,originale sau clone,de obicei nu au rasina ;la cele "clonate"de obicei cedeaza prefinalul,2L sau G1 (mmbt5401/5551),care e un fel de 2n5401/5551 smd,cu puterea disipata de max.350mw si rezistenta termica mare-chinezii le folosesc la majoritatea STK-urilor inclusiv la cele de puteri declarate mai mari,gen STK4231,etc.

 O solutie ar fi desfacerea cu atentie a capacului si inlocuirea lor cu tranzistoare mai potente,dar e o intreprindere dificila si riscanta.

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