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EKCO U354 FM RADIO 1960 SM

AUDIO - SERVICE MANUAL
Type: (PDF)
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384.4 KB
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2
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    EKCO U-354 RADIO U354 FM 1960 354
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Relevant AUDIO forum topics:
MEGOLDVA sharp rp 113 lemezjátszó szíj mi a mérete?203X0,7X5
Üdv.
Címben említett lemezjátszóba keresek szíjat. Ami benne volt az elkátrányosodott. Miért kell ilyet csinálni? Tök macerás kitakarítani?
A manuáljában nem találtam a méretet csak kódot.
tudja valaki a méretet? vagy mérjem...
Köszönettel D Attila
Audiobank MS2 autó erősítő
Sziasztok! Eme csodához keresek rajzot. Autó erősítő: Maniac Series MS 2. Képek csatolva.
Zeck A-200 Power amp javításánál kérnék egy kis segítséget! (tippeket)
Sziasztok! Van nálam egy ZECK A-200 (made in WEST GERMANY) erősítő. Mellékletben a rajz! Igaz egy MJ15003 párossal kevesebb van benne. Mert ez a 2x100w-os A lényeg még mielőtt nekiállok úgy igazából! A hibajelenség.... A legkisebb hangerőnél lehet hallani némi magas hangot. Ha feljebb tekerem a hangerőt, akkor egyből a védelem aktivizálja magát. Eddig amiket átnéztem: Tranzisztorok egyesével kiforrasztva átnézve. OK! A tápnál még nem mértem úgy igazából feszültségeket, de a mi feltűnt az a PUFFER kondik (4700uf 63v) kisütve 680kohm és 1,5kohm. Ezek szerintem kuka. De ha valakinek esetleg van egyéb ötlete amin végig kellene mennem mint mérések, azt szívesen elfogadom. + Van a 0,27ohm az MJ15003 emitternél. Oda mos per pillanat 3w-os van rakva. Így kaptam. De ha jól tudom akkor legalább 5W! Előre is köszönöm.
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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