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B-K REFERENCE-4420 AMPLIFIER SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
245.9 KB
Page
17
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    BK AMPLIFIER REFERENCE 4420 B-K
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Relevant AUDIO forum topics:
Készülék beazonosítása
Sziasztok! Tudnátok segíteni milyen gyártmányú a készülék és hogy keressek hozzá rajzot?
Cséve motor keresése Nakamichi BX300E deckbe
Sziasztok! Péter30 kollégától vettem ezt a decket, elég sokat szöszöltem már vele, most, hogy a fő problémáját már sikerült megoldani kiderült, hogy a csévélő motor is rossz, vagy legalábbis betegeskedik (BSH7B02 és 41204-A van ráírva), mivel terhelés hatására néha ,,beakad'' de nem mechanikusan, hanem elektromosan, én már vagy négyszer szétszedtem, de nem eddig nem sikerült az állapotán javítanom, jobb híján cserélni kéne. Külföldi magnós fórumon azt a tippet kaptam, hogy jó a Mabuchi RF-510T motor jó lenne helyette, ennek a megfelelője itthon a conradnál: ez de nem olcsó, ennél tudnátok nekem olcsóbb helyettesítőt találni?
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
paso T540 TR-S erosito beuzemeltetese
Sziasztok Valami regi lomok kozott elokerult egy ilyen erosito: paso T540 TR-S Sosem hasznaltam, ugy kaptam valakitol, de nem nagyon figyeltem ra. A raragasztott cetli szerint "OK", de nem mertem bedugni, mert poros, paras, stb. Mi a velemenyetek, erdemes-e azzal foglalkozni, hogy atnezzem, kitisztitsam, esetleg a kiszaradt elkokat kicsereljem, stb? Regiseg, vagy csak ocskasag? Az elkok szerint kb 1985 gyartmany. Az allapota nagyon szep, es egyaltalan nem volt piszkalva. Ket mikrofon es ket vonalbemenete van, de nagyon becsuletesen meg van epitve. Ha valaki ismeri netan, akkor velemenyeket varok. Minden jot, Janos
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