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BELMONT RADIO CORP. 7D22, SERIES B SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
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127.3 KB
Page
3
Category
AUDIO
SERVICE MANUAL
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    BELMONT RADIO CORP. SERIES 7D22 22
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Relevant AUDIO forum topics:
Castone UT-500 -ast vennék. Járt már valakinél ilyen? Nem gagyi?
Sziasztok! Kinéztem magamnak egy Castone UT-500-ast, aminek a jobb fele nem szól, állandóan protecten van. Vagyok annyira bátor, hogy feltételezem, meg tudom javítani (szétégve nincs, bár kicsit tartok tőle, hogy az elődöm, akitől veszem, mikkel próbálkozott javítás címén). Arra lennék kíváncsi, hogy javított-e már valamelyikőtök ilyen masinát, illetve használt-e? Mert ha kiderül, hogy gagyi kínai utánzat, akkor nem bajlódom a javításával. Minden hozzászólást nagyon megköszönök, főleg, mivel holnap venném meg a végfokot.Vásárlás előtt bele tudok nézni, úgyhogy ha tudtok segíteni mire figyeljek, azt nagyon megköszönném. Egyébként régebbi castone-okat javítottam hasonló hibajelenséggel többször is, többet is. Ott a régi (teljesen épnek látszó, még multival is legtöbbször jónak mért) biztosítékok kontakthibásak voltak, és azért jelzett CLIP-et, de azok régebbi 100 voltos modellek voltak. Ennek nem ismerem a lelki világát, gyanítom, kicsit modernebb belül. Előre is köszönöm a segítséget. Üdv! Kori
daewoo akf-9255v
Üdv Mindenkinek! Daewoo akf-9255v típusú autórádióhoz keresek kapcsolási rajzot.Pár alkatrész elégett, és a színkód nagyon nem olvasható...Köszönettel:FEJO
Thomson AM1460
Tisztelt kollégák! Thomson AM1460 hifitorony (vagy hozzá nagyon hasonló készülék) használati utasítására lenne szükségem. Akinek van,vagy tud bármilyen módon segíteni kérem küldje el vagy írjon a frkec@freemail.hu -ra. Köszönöm szépen és jó estét mindenkinek.
NAD 3140 amplifier - power transistors getting hot
This one had been sitting in a barn for years. Powered it up and the large power transistors on the heat sink would get hot
after a time....and the heat sink would also get quite hot. Speakers sounded like they had some DC on them....with a loud thump

Found the manual on Hi-Fi engine,
http://www.mediafire.com/file/b8mlsu7q3pz0bvf/hfe_nad_3140_service.pdf/file ]
and saw a video on youtube saying lots of capacitors dry out
due to their locations near resistors that get very hot, I guess sorta a poor
design. Went in and recapped almost the entire
product save for the (4) large 50V PS caps which appear to check ok.None of
the high power or driver transistors
mounted to the main heat sink were shorted..

Powered on but no audio, and noticed the fuses to Bridge D805 were melted open.
I believe they were ok before.
Replaced them and they started to light up like fiilaments, so shut down,
removed the bridge D805, then checked it, its ok.

There is about a 16 ohm short on the + / - lands where the bridge was. It
seems like something I did maybe is causing this,
like a capacitor in backwards, which I am doing alot of lately for some
reason.

Turns out, yep I put C805 (470/ 63) In backwards ! Capacitor still checks
ok, so will re-use it.

Short is still there though Im guessing R803 is adding in 5.6 ohms or so,
that means theres a 10 ohm short someplace. Q801, 802 arent reading short,
and looks like this becomes a +43V ps feed.

Any ideas out there on what to check next? I am guessing this cap in
backwards caused the voltage applied to a component to be
reverse and its shorted. Or would this be normal with a reversed cap installed,
and putting it in right would be how to fix it?

Steve Hearns
Technotronic Dimensions [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
 
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