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KRELL KAV-300I SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
2.6 MB
Page
31
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    KRELL KAV-300I KAV300I KAV 300 300I
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Harman Kardon ONYX STUDIO 3 javitasahoz keresek segitseget.
Sziasztok`
Van nalam egy Harman Kardon ONYX STUDIO 3 Bluetooth hangfal.
Teljesen halott, nem jelez toltest es nem kapcsol be. 
Egy Li-Ion 18650-es akkut hasznal aramforrasnak, ennek a feszultsege helyes.
A fo panelen talaltam ket elrobbant SMD biztositekot (FB21 es FB22)





Sajnos az a szerviz-konyv amit a tanyan is megvan, az nem ez a verzioja erositohoz valo.
Nincsen-e valakinek ehhez a verziohoz rajza esetleg?
Ennek a jelolese 40-0ONYX3-MAF2G
Nem szeretnek talalomra beforrasztgatni biztositekokat, de azt sem tudom, mit csatolnak, teljesen a sotetben tapogatozok.

Elore is koszonom a velemenyeket.
Minden jot,
Janos
 
Belson BR-185 rádió mintha elvesztette volna az érzékenységét [téma elengedve]

Sziasztok!

Egy bácsika hozta a fenti készüléket, meg tudom-e menteni.
https://www.radiomuseum.org/r/belson_br_185.html
https://helikon7.wordpress.com/2010/01/23/benson-br-185/
Olyan, mintha elvesztette volna az érzékenységét. Hanggenerátorról 1MHz, AM 100% löket 440Hz a vezetéket mellétéve lehet fogni, tehát működik, viszont adókat nem tudok vele behozni.
Mit mérjek rajta? Rádiókkal nem  foglalkoztam még.
Illetve Székesfehérvár környékén valahol 540kHz-en milyen adó jön, és pontosan milyen frekin? Másik rádión annak egész jól jött a jele.
Üdv: Jácint

 

RCF art 415-A speaker - PSU not working
Hello everyone,

I've this speaker model:
RCF art 415-A. 
The power supply is faulty, no votltage out to the amplifier. 
The Mosfets are blown. I've changed the mosfets and it's driver, and still have a problem.
I tried to switch on but only one of the mosfets gets hot (the one which switches the 310. There are 2 of them - Mos5 in the scheme).
Obviously I turned it off. 
1) What causes it to heat?
2) Testing the VCC of the LMC555, it's only 2.7V. When taking it out of the circuit, it's 12VDC! What makes the voltage to drop. Where does the supply of the LMC555 come from? The VCC of the 555 should be around 10V, as compared with a good card.
I've changed the 555, but the problem remained. I've checked the components around, resistors and capacitors, and transistors, and seem to be OK.
4) The VCC of the Mosfet driver is 10V, but should be 12V if compared with a good card.
3) Could the trafo be damaged? Are these parts reliable or may blow up?
4) What is the purpose of the optocoupler in the circuit?

I would really appreciate any help.

I didn't find the 100% schemes for this RCF (400), but found a very similar one (The 600 version).

name and a link here to download the pdf.
DigiPRO600B
https://elektrotanya.com/db-technologies_digipro600b_sch.pdf/download.html

Regards and many thanks

 
Aiwa TP1012 régi szalagos magnó capstain működési elve. Megoldva!
Sziasztok! Nem ismeri véletlenül valaki az ezer éves (bocsánat, csak 900!) Aiwa TP 1012 szalagos magnetofon capstain működési elvét? Ha esetleg rajz is volna hozzá, az csak hab volna a tortán, ugyanis már jártak benne. Köszönettel Attila
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