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QSC 1400

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    QSC 1400
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Relevant AUDIO forum topics:
Yamaha CDX-590 laser adjustments?
I have a Yamaha CDX-590 CD player and it skips on some CDs - original CDs, these CDs play without problems on my other CD players. I have changed the laser unit (KSS-210A) but this didn't solve the problem. When I turn the player upside down, it plays the problematic CDs without a problem. That's why I think the laser needs adjustment. I have only a service manual for the CDX-493/593 but they should be very similar to the CDX-590. It seems that the adjustments are done via "test mode" of the CDX-590, unfortunately there is not much information, how to exactly, in the service manual. Here is a picture of the PCB. http://www.volny.cz/hwtest/PCB.JPG Here are the "test mode" sections of the service manual. http://www.volny.cz/hwtest/TM1.GIF http://www.volny.cz/hwtest/TM2.GIF In "test mode" I have tried Auto adjustment mode 1, 2, 3, but I don't know if it should work fully automatic without any intervention or when the mode is fineshed and I can proceed to the next one. So I activated mode 1, waited a while, activated mode 2, waited a while, activated mode 3, then exited test mode. It didn't help. Mode 1 - only a short blink of two horizontal dashes on the display and thats it Mode 2 - started "play" without sound from a strange time 99:00 (the test CD is not so long), after a while it skips to another time, "plays" a while, then skips back and "plays" and so on, I left it about an hour and it was still going on Mode 3 - seems to be very short as mode 1 I think I'm missing something ... Maybe someone did this or even serviced Yamahas in an official service and can provide information how to adjust the laser? Or maybe the problem is not the laser?
Samsung MM-L7 hifi
Üdv az uraknak! A gép egyszerűen nem működik. Ami tápot mérni tudtam, az mind megvan. Procon is vannak mindenféle öt meg három voltok. Kijelző fűt. Én prochalálra tippelek, de hátha van valakinek jobb ötlete?
Pioneer XR-P 3500 nem szolal meg
Sziasztok. Adott egy Pioneer xr-p3500 tipusu hi-fi torony, ami nem szolal meg. Odaig eljutottam , hogy az erosito panelen levo dual op amp (upc4570) nem kap tapfeszt. Ezt furcsamod nem a stabkockakrol kapja, hanem egy PAC006 tipusu ic-bol. Ebbe megy be a mute fesz is ami 4,6v, tehat nincs aktivalva a mute funkcio. Megis a +-12v-ot szolgaltato labakon 0 v van. Amit meg eszrevettem: a -12v-os stabkocka kimeneten csak -9,5v van. Ez egyben a PAC006 ic negativ tapfesze is. Lehet ez a problema?
Grundig R35
Végre megvettem gyerekkori álmaim netovábbját, a GRUNDIGOT! Sajnos az a bánatom, hogy bekapcsolás után kb. negyed óráig folyamatosan elhangolódik, mindig utána kell húzni. Negyed óra után beáll, és a beprogramozott adókat is jól hozza. Sajnos sehol nem találok hozzá kapcsolási rajzot. Tudna valaki segíteni egy rajzzal, vagy valami ötlette, hogy mi lehet a hibája? Előre is köszönöm a segítséget.
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