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LUMOPHON MARKGRAF W RADIO SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
Pioneer VSX-329K erősítő néma
Szervusztok!
A fent erősítő néma, és szinte biztos, hogy a digit lap hibás. A proc. melletti kvarc környékén valami folyadék szétmarta a fóliákat, amit már ráadásul próbáltak javítani, és nagyon csúnyán néz ki . Szükségem volna egy rajzra, de a SM-keresőben csak kezelési utasítás és alkatrészlista található. Ha tudna valaki segíteni rajzzal, megköszönném. Mindazonáltal nem nagyon hiszek a sikerben, de legalább megpróbálnám.
Köszönettel:
Attila
Fisher embléma
Üdvözlöm a fórumozókat!

Keresek egy Fisher emblémát képként, jó minőségben.

Üdv.
Sony STR-DE497 nem kapcsol be. Megoldva.
Sziasztok. Belebotlottam ebbe a tobbcsatornas erositobe, ami nem akar bekapcsolni. Vegigolvastam "petervis" irasat a neten es bar ugy irja, hogy az en modellemre is ervenyes, valojaban semmi koze hozza. Tehat a st-by panel: 2 kulonallo aramkor van rajta, egyik a st-by aramkor amit a st-by trafo taplal, a masik amit a fotrafo taplal. A st-by aramkor kimeneten megvan a 11v, ez atmegy a digi panelra, ott megtaplal egy 3,3v-os stabkockat, onnan a 3,3v atmegy az elolapi panelra ahol csak az infravevot taplalja. A proci egy 5v-os agbol kapja a tapot, visszafele haladva eljutottam a st-by panelra, de a masik aramkorbe, amely a fotraforol jon taplalva. Ertelemszeruen a proci laban nincs tapfesz. Hogy kapcsol ez be?
Rotel RA-980BX equivalent transistors
Hi All,


I have a Rotel RA-980BX amp with a blown channel. I have sourced most of the transistors, but am struggling to find the other 4.


Part numbers as follow:
2SC3478
2SC4381
2SA1376
2SA1667


What would be suggested equivalents / suitable replacements?


Also, some advice, I suspect the bias pot to be bad. Based on the circuit, would you think that the bad bias pot would cause the drivers and outputs to blow? Any suggestion on modification to prevent this re-occurring?


Thanks



Regards,
Werner
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