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ATMOSFERA-2 OROSZ RADIO SCH.

AUDIO - SERVICE MANUAL
Type: (DJVU)
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19.1 KB
Page
1
Category
AUDIO
SERVICE MANUAL
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    RADIO SCH. ATMOSFERA2 OROSZ ATMOSFERA
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Relevant AUDIO forum topics:
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

 
SHERWOOD R-725RDS
Hi mindenkinek! Eme szörnyeteg kapcsolási rajzát keresem, közel annyi alkatrész van benne mint az USS Enterprise űrhajón ami nem is lenne baj ha működne:). Fél nap potyára guglizás után gondoltam még itt megpróbálom, hátha valaki épp egy ilyen dokumentumot őrizget. Előre is Köszi. Üdv.
BMW 630i rádió.
Üdvözletem Mesterek ! Némi segítséget kérnék. Az említett BMW 630i gépből a rádiót szeretném kivenni. Egy robbantott rajz a kiszedéshez igen jól jönne. Nagy navis 2008-s . Valamint egy MUTE szálat keresnék, mivel Trafipax jelzőt és társait építenénk . Ami fontos az azonosításhoz :CV75328. Segítséget előre is megköszönve. Tisztelettel:Öreg T.
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Sziasztok! PIONEER A303R erősítő hangerőszabályozójának cseréjével kapcsolatban vannak kérdéseim. Mielőtt szétbontom,próbálok tájékozódni! A hangerőszabályozó egység "poti" vagy enkóder,vagy egyéb? Javított ilyet valaki? A "VOLUME" egység típusa? (A panelen AWZ 5546 felíratot látok,de lehet,hogy csak alkatrész pozició szám) Üdv. Ottó
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