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BELLSOUND SYSTEMS 2145A INTEGRATED AMPLIFIER SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
panasonic SA-XR70 don't turn on
Hi every body,
could you please help me, i have a panasonic Hifi amplifier sa-xr70 but it doesn't turn on.when i push the power buton the led get off for 3 seconds then turn on again.the display is always off.
thank you very much
Harmann/Kardon SUB TS11 D osztályos erősítöje gerjed 100khz
Sziasztok

Adott egy Harmann/kardon SUB TS11 tipusu mélyláda, a d osztályos erősítője gerjed
szerintetek mi lehet az oka?
a gerjedés 100 khz - en stabilan.
egyébként jól müködik csak a gerjedés miatt túl melegszik
Eddig a kondikat próbáltam a kapcsoláson lévő összes kerámiát!
Megmértem dióda állásban mindent,
a rajzon látható + - 15V stabil, tökéletes, minden ellenállás dióda jónak tűnik.
mit kellene esetleg módosítani a kapcsoláson hogy jó legyen , sokkal stabilabb?
Az irf végfokokat még nem cseréltem a tl072 erősítő IC - t sem.
bármit megtudok tenni érte de elsem birom képzelni miért gerjed...
Tény hogy elb*ott egy konstrukció, de valahogy csak ment :D eddig...
a kimeneteken is néztem a tekercsek értékét hibátlan.
 
Az USA-bol szarmazo radiot ra lehet birni, hogy europai modon keresse az allomasokat? Megoldva.
Sziasztok. Adott egy USA-bol szarmazo Yamaha A45 erosito meg T33 tuner. A radioval az a bajom, hogy nem 50KHz-es lepesekkel keresi az adokat, hanem valami sokkal nagyobbal es igy csak egy nehany adot talal. Ha megoldhato lenne, jo lenne megszeliditeni hogy hasznalhato legyen minalunk. Igencsak keves adatot es kepet talaltam rola a neten, ha szukseges akkor csinalok egy nehany kepet a belsejerol. Egyelore csak mint elvi kerdes erdekel az ugy, mert ha bonyolult a dolog akkor jobban jarok ha veszek egy idevalosi tunert. Udv.
loud 'buzz' upon powering on of amplifier
hello all
i just restored a technics amplifier SU 300, i replaced the  STK (stk4141) and two wire wound resistors .33 ohms 1 w.
every thing started working great, all the controls the volume the sound quality.
but every time i power on the amp a loud buzz echos from the speakers and a big 'tap' upon powering off.
please guide me finding the issue.
thanks in advance
sandeep
 
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