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Bem-vindo,
Visitante
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Eu encontrei esta imagem no 4shared.com
Falei com um dos técnicos que trabalhava na reparação da technics e ele disse-me que era um problema da ventoinha, que ela accionava tarde demais e para eu colocar um condensador cerâmico aos terminais dela, sugeriu 20pF. Assim fiz! Mas..... O problema mantêm-se!!  Então percebi, que o problema seria do aquecimento do amp, Coloquei um termopar em cima dele, e esperei que ele se desligasse de novo, então, o termopar detectou máx 38ºC quando ele se desligou! Fui buscar um compressor e voltei a testar, mas agora sempre a soprar para o amp que voltou a desligar-se mas desta vez não passou dos 23ºC. (a temp. ambiente era de 20ºC) Ou seja, ele desliga-se independentemente da temp do amp. Será que é um dos condensadores que deu o berro? |
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encontrei isto aqui:
I found this but it's something to another model: Technics - SUA900 amplifier The sound breaks off due to the tip actuation ukladu security force.Most breaks in the playing, there was a time when the level of output was such that the fan cooling fan is barely obracał. The amplifier is designed in such a way that the cooling fan the fan starts spinning when the level of output increases, exceeding a certain limit.However, it may be a delay between the time of application to the fan voltage control circuit, and the fan actuation.If the level of output only slightly exceed the limit, the delay time can be so large that the system recognizes the detector to block the fan that has blocked the windmill fan (as it does not come, he began to turn the voltage control has been applied), and sends a signal into the system by security wyciszył amplifier power.For normal operation the delay time is absorbed by the capacitor C603 of the detection block windmill fan, but when the level of output is the same as described above, the delay can not be reversed.To resolve this problem, change the value of capacitor C603 with a capacity 3.3mikro/5OV on 10mikro/25V Agora só preciso de encontrar o C603 
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