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joestét mindenkinek! donorként került hozzám a fent emlitett rádios-erölködö. mindene müködik,és ráadásul a rádio része sem hangolodik! csak a skála hur hiányzik. esetleg rajz valakinek lenne-e hozzá,mert ujra akarom hurozni. van nekem egy másik ra 6363 s,csak torony része ,és nincs kedvem megbontani,hogy lelessem a hurozást. elöre is köszönöm! üdv:atis :help: ma sikerült ujra skálahurozni,persze másodjára!/jobbra tekerem a tuningot,a mutatio balra megy/:-) köszönöm a hozzászolásokat! üdv:atis

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
 

Sziasztok! Csereérett lett a lemezjátszómban a tű, szerintetek mi a különbség ezek közt? http://www.ebay.com/itm/Needle-Turntable-Kenwood-N-67-N67-Sansui-SN-P212-/261045663066 és http://www.ebay.com/itm/KENWOOD-SANYO-MARANTZ-SANSUI-TURNTABLE-NEEDLE-STYLUS-819-D7-/270408521961

Sziasztok!

JBL tv boost "sound bar" javítása közben elakadtam. Ez 19V betápról megy. Nem csinál semmit. A belső tápja egy AELF feliratú, 6 lábú morzsa. Mi lehet ez?

Vagy mekkora tápot csinál a többi belének? 5V? 3.3V? Van hely, elfér bele más is, de a kimeneti pufferen nincs semmi villany.

Nincs valakinél szétszedve egy, mérésre? :)

Szerk: nem tudok számolni. 8 lábú :)