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RUSSIAN M-648 4-BANDS,5,2-VALVES RADIO 1949 SM.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
567.8 KB
Page
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Category
AUDIO
SERVICE MANUAL
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    RUSSIAN M-648 RADIO M648 4BANDS 2VALVES 1949 SM. 648 BANDS VALVES 4-BANDS 2-VALVES
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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
TECHNICS SA-DX750 F70 hiba
Sziasztok! Most futok neki harmadszor ennek a gépnek, az előző két javítási kísérlet során mindíg megjavult, ma sem tudom, miért. F70-es hibát jelez, most úgy néz ki, nem fog magától megjavulni. Ha valamelyikőtök esetleg tud a javításhoz ötletet adni, megköszönném! Üdv: Laci
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Sziasztok!

A címben szereplő hangdoboz végfok (STA369BWS) csere (mert beáztatták) után a saját 12V-os akkujáról hibátlanul működik, de amikor beindul a hálózati tápja, lenémul.
A tápegysége az akkut tölti, és a végfok számára 25,7V-os tápot is ad, az mégsem szól, lenémul.
A végfok D osztályú, I2S adatbuszon kapja a meghajtást.
A hálózati tápról is (nagyobb teljesítménnnyel, mint akkuról) szólnia kellene.
Talán a 25,7V túl magas (24V a határadata), ezért a tápfesz management letiltja?
Borzasztó apró smd benne minden, mérni még tűheggyel is alig lehet.

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