Service manuals, schematics, eproms for electrical technicians

TANDBERG TPA3003 POWER AMPL

AUDIO - SERVICE MANUAL
Type: (RAR)
Size
1.7 MB
Page
---
Category
AUDIO
SERVICE MANUAL
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    TANDBERG TPA-3003 AMPL TPA3003 POWER TPA 3003
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Relevant AUDIO forum topics:
Panasonic SA-PT150 bekapcsolás után lefagy
Szisztok! Ez a házimozi bekapcsolás után beköszön(HELLO) majd a kijelzőn 5 vonal jelenik meg.Aztán nem csinál semmit gombra és távirányitóra sem. Volt már valakinek hasonló hibája? Köszi "FONTOS! Olyan fórum téma nevet válassz, ami beszédes, minél pontosabban illeszkedik arra, amivel kapcsolatban írsz. Egy lehetséges jó elnevezés pl: ORION LCD PT26S chassis 17MB12-2, a tápja nem indul Az nem elég, hogy pl: "LG LCD-TV" vagy "HP laptop" és hasonlóak. Illetve érdektelen, nem releváns információt se tartalmazzon a cím! A helytelenül elnevezett topik felfüggesztésre, majd 48 óra után törlésre kerül! Felfüggesztett állapotban nem tudnak mások addig hozzászólni, amíg ki nem javítod a címet. A hibás cím utólagos javítása (48 órán belül) a "Szerkesztés" fülre kattintva végezhető el."
Panasonic SA-PMX4 hifi néha kikapcsol
hi. a fenti hifi bekapcs után müxik rendesen majd egyszercsak- változó időben- (5perc,10perc, fél óra) kikapcsol stby-ba. rádióról és cd-ről is kikapcsol, tehát gondolom USB-ről üzemmódról is kikapcsol. néha vissza lehet kapcsolni,de van amikor nem és azt sem lehet tudni mennyi ideig megy. a tetejét levéve a tápban nem látok puffadt kondikat-persze attól lehetnek száradósak---holnap kicserélem őket. ma nemigen lesz időm tovább bontani.. kerestem rajzot de itt a tanyán csak a pmx3 rajz van meg-remélem hasonló... találkozott már valaki a fentebb leirt hibával??? üdv: egon
WRS MRS-0406
Sziasztok! Ennek az autós DVD-nek az a baja hogy egy bizonyos szögben ad csak képet a kijelzője, amikor elő jön a burkolat alól, de amikor megnyomom hogy menjen vissza alap helyzetbe akkor mindig van kép rajta, amíg el nem rejtőzik a helyére. Mi lehet a gond, szalagkábel?
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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