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Adott ez a soundbar házimozi szub, amely ha nincs használva lemegy stand by módba, de nem éled fel, csak áramtalanítás után és olyankor újra kell párosítani a soundbarral. Rajzot nem találtam hozzá és nem is nagyon ismerem ezeket. Esetleg valakinek van ezzel a típussal tapasztalata ilyen hibára, hogy hol induljak el, vagy engedjem el inkább?

tried the number on the back right corner and the numbers on the tuning cap but can't seem to find the radio. Even tried looking on Ebay. Cleaned up all the switches and AM works great but can't get anything on FM. Tried a signal generator on FM and the radio I listen to picked it up but not the silvertone. Freaked out the cat with the tone Thanks in Advance everyone http://s276.photobucket.com/albums/kk15/oakdust/Silvertone%20Radio/

Sziasztok! Van nálam egy régi rádió-erősítő javításon. A belseje tele volt porral, kifújattam. Viszont valószínűleg párát is kaphatott mert a panel alkatrészoldalán több helyen a por nagyon belekötött. Alkoholt nem szeretnék elpazarolni a kimosására. Olyan helyeken is van kosz, ahol mechanikusan elég nehezen hozzáférhető. Mivel szoktátok fellazítani és eltávolítani az ilyen jellegű szennyeződéseket? Üdv.: Kumi

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