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POWER-ACOUSTIK LT-1920 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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  • Also known:
    LT-1920 LT1920 LT 1920 POWER ACOUSTIK
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Relevant AUDIO forum topics:
Phonic Powerpod 1062 keverőerősítő végfok nem működik
Adott egy Phonic Powerpod 1062 keverőerősítő. Úgy került hozzám, hogy bekapcsol, de nem szól. Szétszedtem és akkor szembesültem azzal, hogy az egyik oldalban szét van égve több ellenállás, valamint az egyik végtranyó. Pár mérés után kiderült, hogy zárlatos mindkét végtranyó, a meghajtók, valamint 2 fet, ami a végtranyók tápellátását szolgálja, ha jól látom a rajzon. Jelzem nem vagyok profi, csak hobbi szinten javítgatok. A rajz szerint 2 féle tápról üzemel, ha jól tudom ezt hívják emeletes tápnak. A rajz fent van itt a tanyán. Most odáig eljutottam, hogy kicseréltem a szétégett ellenállásokat és az összes zárlatos tranyót, fetet. Most indul a végfok, behúz a védelem reléje is, de még nem mertem indítani, csak a hálózati bizti helyére kötött 100W-os izzóval. Működik, szól is, de ahogy írtam nem vagyok profi, így nem tudom esetleg kell-e még valamit cserélni/megnézni, mielőtt beteszem a biztit és élesben próbálom. Nem szeretném ha ellőné az új alkatrészeket és azt sem tudom, hogy mi a fene okozhatott ekkora pusztítást. Aki esetleg javított már ilyet, vagy tudna adni néhány jó tanácsot, azt megköszönném.
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
 
Phonic PowerPod 410R
Hello, good afternoon, good people from the Forum, someone have a Phonic Powerpod 410R schematic with (Class D amplifier) I will really appreciate it
Powerstate PB100-12 végfok hiba
Sziasztok!
A fent említett combónak a végfokról kellene  az ellenállások értékei (R61;R14;R15;R6) .,ha valaki tud segíteni megköszönöm.
Üdv: Attila
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