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ARISTONA DX7373 1967 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    ARISTONA DX-7373 DX7373 1967 DX 7373
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Relevant AUDIO forum topics:
universum system hifi 7500SL v2315a quelle rajz vagy kép
Sziasztok Ha rajz nem is lenne ehhez a készülékhez de van róla valakinek egy pár képe a panelokról ,megosztaná-e velem? http://www.hifi-wiki.de/images/7/72/V_2315_-_UNIVERSUM_7500_SL.jpg Egy pár vezeték leszakadt, addig is megpróbálom megkeresni a helyét. A rajzot is elfogadom ha lenne :-). Most már az is van. http://elektrotanya.com/universum_v2315a_system_hifi_7500sl_stk3042_stk0050.pdf/download.html Nagyon szépen köszönöm.
KENWOOD KDC-4051 PROTECT
Sziasztok! Áram alá helyezéskor már a PROTECT felirattal kezd, semmilyen gombnyomásra nem reagál, cd-t beveszi-kiadja de nem forgatja meg és teljesen néma. Végfok-ic, cd-egység eltávolítása után a helyzet ua., a regulátor ic-nél /IC901 LV5680/ vannak eltérések tápfeszekben, 6-8 lábon fele feszültség van a rajzhoz képest, a 14-15-ön pedig 0v a 4,9 ill. 13,5v helyett, az alaptápok mint a 3,3-5-8,5-9v-ok megvannak. Nem tudom hogy bekötési hiba után lett-e ilyen vagy menet közben, van-e ötlete valakinek hogy mi lehet a gond, a regulátor ic cseréje sem túl egyszerű próbára mert 4-5ezer körül van S-nél és nem egyértelműen néz ki hibásnak, panel teljesen ép, gyanúsnak tűnő alkatrészt nem találtam, köszi.
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
 
Blaupunkt előlap mindig kivilágítva?
Sziasztok! Hozzám került egy Blaupunkt Bristol CD35 típusú autórádió. A kérdésem ezzel kapcsolatban ahhoz szól elsősorban, aki ismeri ezt a szerkezetet. Kikapcsolás után is folyamatos megvilágítás alatt tartja a kijelzőt és a gombokat. Ennek így kell lennie, vagy valami elváltozása van odabent? Ha ezt így találták ki, akkor szigorúan gyújtás kapcsolóval sorba kötve kell használni mert idő előtt feléli az aksi tartalmát. Még nem találkoztam ilyennel, azt hiszem. Aki ismeri, kérem írja le nekem, hogy helyesen működik-e, vagy álljak neki nyomozni. Előre is köszönöm! Üdvözlet.
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