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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

Szervusztok! Onkyo CR-325 mini hi-fi tuner rész elég ergyán szól, zajos. Tipusa (MItsumi FAE385-E11F) Erről a tunerról eddig nulla infót találtam. Az A02F/J02F verziókról igen viszont más a lábkiosztása. Belső rajz meg nyista eddig. Az an18200a adatlapja sem egyértelmű számomra. Bármi infót szívesen fogadnék. Köszönettel: Tibor

Hi everyone

Could somebody tell me if I can replace a switching diode to another one, the one installed in the onkyo is a 1SS252 and is 10 times more expensive that a 1SS355.

Usually I order the same but they are pricey (around 10.00 usd for a 100) and not commonly used, not many sellers.
For the 1ss355 every seller on line has it in stock and it's around 1 to 2 usd for a 100.
Ans they are available locally, not in china waiting 5 weeks for the part.
Thank you.


1SS352
Characteristic Symbol Rating Unit
Maximum (peak) reverse voltage VRM 85 V
Reverse voltage VR 80 V
Maximum (peak) forward current IFM 200 mA
Average forward current IO 100 mA
Surge current (10ms) IFSM 1 A
Power dissipation P 200 (*) mW
Junction temperature Tj 125 °C
Storage temperature Tstg −55~125 °C

1SS355

Characteristic Symbol Rating Unit
Maximum (peak) reverse voltage VRM 90 V
Reverse voltage VR 80 V
Maximum (peak) forward current IFM 225 mA
Average forward current IO 100 mA
Surge current (1s) IFSM 500 mA
Junction temperature Tj 150 °C
Storage temperature Tstg −55~150 °C
 

Üdv mindenkinek. Hozzájutottam egy Onkyo erősítőhöz, melynek a hibája, hogy egyrészt 120v-os hálózatra készült, hálózati csatlakozója hiányzott. A készenléti táp panelon kicseréltem a trafót 220v-os feszültségűre. A táp. trafót kikötöttem róla. Majd bedugva a hálózatra a készenléti táp reléje csak kattog mikor bekapcsolom. Kérdésem még, hogy esetleg melyik tipusú erősítő 220-as trafója lehet jó bele az onkyo-k közül? mert akkor kicserélném benne. Előre is köszönöm a hozzászólásokat.