Service manuals, schematics, eproms for electrical technicians

FBT BASSORGAN SCH

AUDIO - SERVICE MANUAL
Type: (ZIP)
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Category
AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
ONKYO TX-DS494 low volume problem solving experience
Hello. here is a message to share my experience in solving a problem that appeared on the home-cinema amplifier ONKYO tx-DS494. In order to sell this amplifier I had to check if all the outputs and all the functions works properly. On the back of this amplifier you have to frontal output : A and B. I connect a pair of speaker on A output : no problem. I can adjust volume. when i connect the pair to the b output and turn the volume knob no sound came out of the speakers until I reach a level defined by I don't know what. :hmmm: My volume level goes from 0 to 80db ( if I remember well ). from 0 to 23 db no sound and when I reach 24 dn sound increase and stabilize. With hearphone connected, i don' have this problem so I conculde that amplifing transistor could not be incriminated. I checked on the service manual and saw that there are two or three component that could be the source of the problem : the main processor, some capacitors on the output PCB and relays. I began testing capacitors: no pb. then I thought that if cannot be the main proc because it ( I think ) works in a binary mode: it works or it doesn't. so I decided to switch between themselves the two relay and :super: : it works. The relays was in fault and did not switches properly. here is my experience in repairing an amplifier
ONKYO TX-7420
Sziasztok! A jelenség a készüléknél, hogy a rádiótuner frekvencia kijelzése, vagy a frekvencia 0.15Mhz-el el van tolódva. Tehát 100.8Mhz helyett 100.95-öt mutat. Mi lehet a gond? Ha esetleg rajzzal is tudna valaki segíteni, nagyon megköszönném. Köszi!
AIWA NSX-S70 hifi bizonytalan bekapcsolás (MEGOLDVA)
Üdv tisztelt kollégák!

A címbéli compact hifi készülék (hátulján Model No.:CX-NS-70V) bizonytalanul működik. Alap esetben agyhalottnak tűnik, nincs készenlét, be sem kapcsolható, pedig a tápegysége működik. Egy-két nap állás után ha úgy gondolja elindul, működik, bár a kijelző először kissé zavarodott karaktereket is megjelenít, de működik. Rövid időre áramtalanítva majd újra üzembe helyezve tökéletesen működik, ha készenlétbe kapcsoljuk, bármikor újra beüzemelhető. Viszont ha egy órára áramtalanításra kerül, akkor megint csak újabb egy-két napos üzemszünet után kapcsol csak be. Doksit találtam, bár nehéz rajta eligazodni.

Esetleg ha valakinek volt már ilyen megoldott hibaesete.
 
Melegedő transzformátor
Hello Mindenkinek! Erősítő trafó melegedésről lenne szó. Igazság szerint önmaga melegszik fel(szinte forró) hálózatra kötve. Tekercsek mérve jók.  Próbáltam több működő erősítőből kitermeltet is azok is ugyanúgy kis idő elteltével melegednek.  Gerjedés lenne nem tudom de ha valaki találkozott ilyen hibával ossza meg velem mit javított vagy tett ez ügyben. 
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