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Sziasztok!
Ma néztem meg, mert a cd rész mindig forgot , a két ékszíj volt szakadt. A magnó részen a csévélés mind a kettő részen megy, de a lejátszásnál csak a fejet emeli fel,és megáll a motor nincs meg a fesz a bemenetén, de csévélésnél meg van. Mi váltja a feszültséget a motorhoz, hogy egyik oldalon sem megy?

Sziasztok szereztem egy nordmende pa980 as erősitőt csak sajnos hiányos és ezért kapcsolási rajz kelene nekem hozzá. Ha valakinek megvan tölcse már fel. Előre is köszi

Tisztelt fórumtársak!
Tulaj állítja, hogy sötétben nyomkodta az előlapi gombokat, majd később azzal szembesült hogy 200kHz-enként léptet adó keresésekor.
Használatit nem találtam, bízom benne hogy valaki tudja hogy hogyan lehet visszaállítani a keresés 50kHz léptékre, köszönöm.

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