Ayuda para reparar mi amplificador Sony Ta-f3a

[juandita06]

hola a todos, tengo un amplificador antiguo marca Sony modelo TA-F3A, el problema es que no funciona, resistencias quemadas fusibles quemados y transistores no los he comprobado todavía, según he leído estos amplificadores tienen problemas con 2 diodos en concretos pero no se cuales son sus equivalentes (internet no reconoce estos diodos) y tampoco se ajustar el sesgo ni nada de eso. tengo conocimientos básicos de electrónica pero nunca he reparado un amplificador. el servicio técnico lo tuvo 6 años y no lo arregló. ¿alguien me podría ayudar? Gracias de antemano.

 

[benricci]

For those who don't speak Spanish, here's a rough translation:

Hello everyone, I have an old Sony amplifier model TA-F3A, the problem is that it does not work, burned resistors, burned fuses and transistors I have not checked them yet, as I have read these amplifiers have problems with 2 specific diodes but I don't know which ones they are their equivalents (the internet doesn't recognize these diodes) and it won't adjust bias or anything like that. I have basic knowledge of electronics but have never repaired an amplifier. the technical service had it 6 years and did not fix it. someone could help me? Thanks in advance.​

 

[bzb882]

Used an on-line translator::
Hello everyone, I have an old Sony amplifier model TA-F3A, the problem is that it does not work, burned resistors, burned fuses and transistors I have not checked yet, as I have read these amplifiers have problems with 2 specific diodes but I do not know which ones they are their equivalents (the internet doesn't recognize these diodes) and it won't adjust bias or anything like that. I have basic knowledge of electronics but have never repaired an amplifier. the technical service had it 6 years and did not fix it. someone could help me? Thanks in advance.

 

[bzb882]

If you're talking about the bias diodes (VD1220). Each would be replaced with 2 1N4148 in series. I've seen it recommended that each pair be encased in JB Weld and attached to the heat sink (like the VD1220s should be).

Si está hablando de los diodos de polarización (VD1220). Cada uno sería reemplazado por 2 1N4148 en serie. He visto que se recomienda que cada par esté encerrado en JB Weld y conectado al disipador de calor (como deberían estar los VD1220).