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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

Sziasztok!
Van pár onkyo-s hang problémás topik, de nem találtam ezt a típust. Onkyo tx sr 703 e.
A probléma, nincs hang. Minden funkció működik. Néha előjön, resetelést követően, olykor halk, stb.
Arra figyeltem fel, hogy az egyik hűtőborda nagyon fűt. 4 tranzisztor van rajta. Képet csatolom. Nem tudom ez mit csinál az erősítőben. A bekeretezett rész.
Ha valami tudna irányt mutatni, köszönöm!!!

Szervusztok Mesterek, Keresem az Onkyo TA2640 kazettás magnó szervízkönyvét, ha valaki feltöltené, vagy elküldené privátban, megköszönném. üdvözlettel Fand895

Can anyone help me with this service manual?
I have a unit with damaged Ethernet port.