Service manuals, schematics, eproms for electrical technicians

NATIONAL NC173 RECEIVER SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    NATIONAL NC-173 NC173 RECEIVER NC 173
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Relevant AUDIO forum topics:
WECONIC QX-660 sm kellene már nem keresem.
Szevasztok segitsetek megkeresni ennek az autó rádiónak a kapcsolási rajzát.
Reloop 1400 erősítő
Kedves kollégák! Szert tettem egy fent nevezett kínai csodára...nagyon pofás kis erősítő, egyszerű kapcsolás. Szemre olyan 5-600W-os toroid, kicsi hűtőborda, két venti. Problémám az, hogy a ventik nem kapcsolnak be. Van a bordákon két hőkapcsoló. az egyik egy NC-állású, ez a védelem reléjét oldja, ha túlmelegedne (szerintem olyan 60-70C-fokos lehet...). A másik egy NO, ez akkor kapcsolná be a ventiket, ha már érezhetően melegszik a borda... Na ez az ami nem működik. Kérdésem az, hogy honnan lehet ezeket beszerezni??? mi a nevük??? kb.12-14mm átmérőjű 10mm magas henger, hátán két faston-saru... egy tojás alakú gyűrű segítségével, két csavarral rögzíthetjük. (olyan, mint pl. a kávéfőzők hőkapcsolója...) cél, hogy 30-35C -on kapcsoljon be,12V-on,max 1A-t. Előre is köszi a segítséget!!! stonhy
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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
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