Service manuals, schematics, eproms for electrical technicians
NATIONAL UA350
Type: 
(RAR)
(RAR)Size
798.2 KB
798.2 KB
Page
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar national manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar national manual?
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NATIONAL UA-350 UA350 UA 350
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If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!
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Relevant AUDIO forum topics:
Sziasztok!
Először is szeretnék elnézést kérni azoktól, akik segíteni próbáltak egy másik témában.(Képcső,lehet-e még javítani) Sajnálom hogy elmaradt a pontosítás, és a kiegészítés,de egy szomorú esemény miatt nem volt sem kedvem sem időm folytatni a témát.Még egyszer bocsi!
Most viszont ismét szeretnék tőletek segítséget kérni!
Egy Sony AT-DS70 típusú erősítőt hoztak hozzam hogy nézzem meg mert nem szól de a bemenetet jelzi.Valóban a gép bekapcsolásakor a kezelőlapi bemenet választó kapcsolók és a kijelző rendben működött, de egy árva brumm nem sok, de annyi sem jött ki a végfokból.A nyákot kiemelve láttam a táp pufferek fel vannak lazulva.Újra forrasztottam majd ismét beindítottam.A védelmi relé meghúzott (előtte az sem ment)de a bemenet választó már nem működik. Ha megnyomom bármelyik gombot a kontroll LED világít majd elhalványodik , de nem marad úgy. a bemenetek szintén halottak.Semmit nem zártam rövidre ,vagy szakítottam meg,csak a kondikat forrasztottam vissza.A végfokot (STK 4152II) kiszedtem de nem változott semmi.A bemenet választó IC (LC7818) tápjai rendben vannak.Rajz és egyéb dokumentáció híján ennyi ami tudok róla.
Ha valakinek van valami ötlete szívesen fogadom.
Üdv belfi
I have and found most of the voltages as indicated on the circuit diagram, till op amp M 5218P; are near those specifed. The output on the centre of the two power transistors of both the channels are also alright.
While looking at the voltages on test points as mentioned on the page 7 for setting up quiscent current, these cannot be set.
Bit of history, the amplifier was lying unused for long time. Nothing in it has burnt. It was never opened earlier than this time, couple of days back.
While looking at the voltages on test points as mentioned on the page 7 for setting up quiscent current, these cannot be set.
Bit of history, the amplifier was lying unused for long time. Nothing in it has burnt. It was never opened earlier than this time, couple of days back.
While I was probing for voltages with DMM, with probe on collector of TR413 one of the fuses blew up. Later same thing happened on the other channel as well.
With the above as background can a Good Samaritan figure out feasibility of repair.
i am unable to upload service manual as file size is 7.3 mb
Üdvözlet a kollégáknak ! Sony TC KE240 kazettás magnó trafója elromlott nem tudom megállapítani a szekunder oldali háromféle feszültség nagyságát, ehhez kérnék segítséget.. köszönöm !
Because I did not found it and I was forced to buy, you get it for free!
https://mega.nz/#!RlpCxCRQ!zhVCwJnC3dDiYlJSmDqRMOVeLzL7soairMfFxsup61A
https://mega.nz/#!RlpCxCRQ!zhVCwJnC3dDiYlJSmDqRMOVeLzL7soairMfFxsup61A
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