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Hi Friends I am looking for a replacement for the Pioneer PAC0101A audio power IC which belongs to Pioneer VSX-D209 amplifier. This IC is available on ebay but because of currency exchange rate and freight charges to Malaysia, it is very expensive. On one of the websites, I saw that it was written PAC0101A=STK411-230E. I guess it means that the Pioneer PAC010A module IC can be replaced by a STK411-230E. I am not sure, is anyone familiar with this IC advice me whether this STK411-230E can safely be used as a replacement. Pls assist Thanks Carlosraj

Sziasztok! Egy erősítőben ki kellett tisztítani a mech. jeladót. Mivel lehetne kenni, ami nem bántja a bakelit és műanyag részeket? Van itthon Kontakt PR, ami potenciométerek tisztításához való, de biztosít némi kenést is. Az jó lehet? Vagy műszerolaj? Abból valami spéci kell?
üdv, István

Az alábbi autórádiókat alkatrészként árulom! -Blaupunkt Mannheim 27 -Blaupunkt Lubeck rcc45 -Blaupunkt acr3230 -Blaupunkt Coburg rcr168 2db -Blaupunkt Car300 -Blaupunkt Köln scr23 -Blaupunkt Lübeck cc20 -Blaupunkt Coburg sqr49 -Blaupunkt Boston rcc45 -Blaupunkt Freiburg sqr39 -Blaupunkt Lausanne előlap nincs! -Philips Dc255 -Pioneer Keh-p8400r -Pioneer Keh 8830sdk -Pioneer Keh-p14 -Pioneer Deh-2300r -Grundig sc303 -Grundig Wkc3904 -Sony Xr-5880r -WW beta4 -Kenwood KDC-9050R -Seat Grundig AURA CD2 -Roadstar CD-853U

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