Service manuals, schematics, eproms for electrical technicians

BELMONT RADIO CORP. 679, SERIES A SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
58.5 KB
Page
2
Category
AUDIO
SERVICE MANUAL
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BELMONT RADIO CORP. 679, SERIES A SCH service manual (1st page)
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BELMONT RADIO CORP. 679, SERIES A SCH service manual (2nd page)
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    BELMONT RADIO CORP. SERIES 679
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Relevant AUDIO forum topics:
Trio-Kenwood: KR-3010 [Radio] S.N.962845 / Does not work, the final floor and prefinal floor defect with many burned component/

I greet you! I would need the scheme of this "vintage" amplifier that needs to be "restored". The problem is that in the prefinal and final floor I have many "fried" resistors well, their value cannot be identified.I replaced the defective transistors: 2SC1509, 2SA777,2SB690 and 2SD 796 (each 2 pcs.) and the electrolytic capacitors adjacent to them. I could not go further because of the carbonized resistors that I do not know their value (I can only guess that they are values small, in the order of ohms). The schematic diagram I downloaded, from the address received by the kindness of a colleague is not complete - it is a single page (missing Q29-Q30-Q31-Q3 and resistors R115-R116-R117-R118 which are completely carbonized, at other resistors I could see their value).Thanks in advance!
Finally, I found the missing part

If stuck in the repair and you ask questions, please do it as follows: - Details: Give the exact model number of your device and the chassis ID (if there is). - If possible, please attach pictures of the appliance. - Anamnesis: Write down the exact symptom. If hard to describe the symptom, it is difficult to verbally defined clearly, attach pictures or sound of the phenomenon! - Tell what was you have done so far: search contact error, which parts has examined or changed yet, etc... The incorrectly named topic suspended and will be deleted after 48 hours! Suspended state while others are not able to comment until you correct the address. Subsequent repair of the defective title (within 48 hours) by clicking on the "Edit" tab can be carried out.

ONKYO HT-R758 BEKAPCSOLÁS UTÁN 3 MÁSODPREC MÚLVA KIKAPCSOL !(MEGOLDVA)
Sziasztok Kollégák !A fenti készülék bekapcsolás után 3 mp. múlva kikapcsol a ko felső sarokban egy ASb felirat van. A 3 mp.alatt amíg él a kijelző minden funkciót lehet kapcsolni,hangerőt állítani,bár nem szólal meg, de sajnos kikapcsolás után sötét kijelző van. Az AUTO STANDBY feliratnak lehet ehhez köze, vagy valami mástól kapcsol ki ? Rutinból a végfok tranyókat néztem meg, de minden rendben van, a meghajtó panelon sem találtam semmit,kihúztam , úgy is ez a jelenség áll fenn. Mi a véleményetek, volt már Valakinek ilyen esete ? Előre is Köszönöm segítő véleményeteket ! Üdv :service
Yamaha MCR 640 CD 640 schematics wanted
Looking for the schematics for a Yamaha MCR 640=CD 640 Not the schematics for the YAMAHA NS-BP300 R-840 MCR-640 MCR-840 MCR-940. This service manual is for the R-840/NS-BP300. For the service manual of the BD-940/DVD-840/CD-640, see to the following publication numbers: BD-940: 101154 / DVD-840: 101155 / CD-640: 101156 THANKS ellemann
Technics su-v3 ismeretlen dioda
Sziasztok! Nemrég cseréltem egy Technics SU-V3-as erősitőt. Teljesen kivégezték. Már megvettem hozzá az alkatrészeket, de egy alkatrésszel nem vagyok tisztában, hogy mi is lenne az. A rajzon úgy jelölik, mint egy dupla diódát, de inkább megkérdezem itt a fórumon, hátha valaki javított már ilyet. Ebből a furcsa diódából több is van benne, a vég részében 4db. A rajz szerint a dióda MA27A2, de nem tudom beazonosítani, milyen dióda lenne. Kérem ha valaki javított már ilyet, segítsen. Már csak ennyi hibája lenne. Várom válaszaitokat! Üdvözlettel: saca200
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