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GELOSO 506 SUPER RECEIVER AND 2621 TUNER SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
Samsung RCD-S50 cd-s rádió-magnó nem indul
Sziasztok!
Segítséget kérnék az RCD-S50 elindításához. Semmit nem csinál, kijelző sem működik. Jelenleg elmcsatlakozóról próbálom bekapcsolni (az 1,5 V-os elemek is jók). A power gomb működik, el is jut a kapcsolási utasítás a proc-ig, de aztán semmi. Ha jól látom, a proc. 94-es pin-re (Power) kellene érkezni a tápfesznek, de valahol elakad. A áteresztő tr-k jók, és a feszültségeik is (szerintem).
 Ha valaki tudna segíteni, megköszönném.
Üdvözlettel:
Attila
May be useful - Harman Kardon information
For your information to repair Harman KArdon HD710 Player uses a KSS210B Pickup (as spare, original unknown) can be changed without any other servicing Harman Kardon Receivers; Series AVR 2000,3000... "Looses memory issue"- gold cap at the front pcb defective. May be changed to a 1µ cap but you have to solder 3 other elko´s to the other side. Keeps memory for a longer time. "Hum noise for the first 5min, warm up" - right lower side at the main pcb: elko 7800µ dead- you can see it at the "cap of it". Replace both (7800µ and 2200µ) to new versions above 25V. "Fuse burnt voltage selection; no green led´s flash, no sound"- cap 2200µ make a short circuit (next to 7800µ). Change these elkos! If you want to make it better... change the 7x 10µ caps for the regulators too. Resolder all points there. "volume changes self to max. or min." change the two resistors at the front pcb close to the volume encounter. be sure that there are both sides 5V! "everything is functional but no sound; but sound from the 6.1ch in" TC9273N-07 is dead (shorted). Have a look at the two caps and the security resistors beneath this chip! My be dead too. Replace this chip only by the -007 version. others will not function. Be careful with the bigger stripe cable! the contact lines are loosen from the plastics. You can help yourself with a "second glue" under these contacts. So i hope i can help you... cheers SG.
CD lejátszó tuning
Üdv mindenkinek! Szeretném egy kicsit megtuningolni a CD lejátszómat, egy Technics SL-PS740-et, viszont az ilyesmiben nem vagyok járatos, de nagyon érdekel a dolog...Elsőre a műveleti erőlködöket cserélném. Most 1db LM833M63, és 3db BA4560FTI dolgozik benne gyárilag, az lenne a kérdésem, hogy mire lenne érdemes cserélni? Az OPA2134-et olvastam, hogy elég népszerű, valóban jó választás lenne?
Technics SU-A700 mk2 aktiv a vedelem.
Sziasztok. Elorebocsatom, hogy ekezetek nelkul irok. Ne ragjatok be ram.

Van ez a Technics su-a700mk2 tipusu erosito. Aktiv a vedelem. Nemhiaba, mert a vegfok bementein +20v van. Mindketton. Eredetileg +20v es +40v volt, es eljutottam az AN7062-ig, aminek a 18. laban -10.7v helyett +6v volt. IC csere sem hozott valtozast, igy kezdtem mericskelni a diodakat, igy akadtam ra egyre (D405) ami rovidzarat mutatott az aramkorben, kiveve oda-vissza vezetett. Csere utan beallt az egyensuly de nem a kivant mertekben - a Q401-402 kollektorain 2.5v helyett +20v van, a B-E fesz 0.6-0.7V mindkettonel. DE! A 18. labon -10.7V helyett most -17v van. Nem egyszer mertem meg, leellenoriztem mas modell rajzan is -10.7v van. Lehet, hogy a RSN6000 lenne hibas?
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