Service manuals, schematics, eproms for electrical technicians

ERRES RA 622 RADIO 1962 SM

AUDIO - SERVICE MANUAL
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432.0 KB
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Category
AUDIO
SERVICE MANUAL
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    ERRES RA 622 RADIO 1962
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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
SEAT SE359 LHD fejegység nem kapcsol be.
Sziasztok! A fenti fejegységnek állítólag nincs hangja. Asztalon viszont be sem kapcsol. Lehet, hogy CAN busz nélkül nem indul el? A tetején van egy bekötési rajz, de aszerint csak +12V és GND kell neki, nincs ACC bemenete. Igy néz ki: http://codedradio.info/pics/SEAT/se359lhd.jpg Üdv.
Sharp sx 8800 H (GY) erősítő javítása
Üdv. Segítséget kérek! Egy sharp sx 8800 H erősítő hibás! a hibája hogy van A+B oldal meg még 2 külön álló oldal na most az A+B oldal úgy szól ha csak az A ra van kötve vagy csak a B re a kettő együtt nem szól a külön álló oldal meg egyáltalán nem szól ami okozhatja IC STK 4050 H 2DB van benne meg egy tranzisztor de nem tudom kimérni őket mert nem tudom az értéket hogy mennyinek kell lenni-e Képek: http://kepfeltoltes.hu/120225/IMAG0073_www.kepfeltoltes.hu_.jpg http://kepfeltoltes.hu/120225/IMAG0074_www.kepfeltoltes.hu_.jpg http://kepfeltoltes.hu/120225/IMAG0076_www.kepfeltoltes.hu_.jpg Válaszokat előre is köszönöm!
SMP-800 keverő erősítő
Tisztelt Kollégák! Egy SAMICK SMP-800 keverő-erősítő került hozzám. Mindkét oldali végfok leégett (hangszóró vezeték zárlat),jó néhány helyen elszenesedett a panel is. Jól jönne egy kapcsolási rajz. Ha valakinek van, kérem segítsen! Előre is köszönöm. Üdv: Kovács GyÖrgy
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