Service manuals, schematics, eproms for electrical technicians
USSR RM 287 S VEF [SM].
Type: 
(DJVU)
(DJVU)Size
4.0 MB
4.0 MB
Page
10
10
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Good luck to the repair!
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USSR RM VEF [SM]. 287
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Sziasztok!
A fent említett készülék csak a center hangszóróból ad életjelet,természetesen minden rendben táp:OK, vizuálisan nincs eltérés púpos kondi stb.
Arra gondolok talán Factory Reset segítene csak eddig nem találtam,hogyan is van ennél a készüléknél ha valaki tudja annak nagyon örülnék.
Segítségeteket előre is köszönöm.
Üdv steewi
A fent említett készülék csak a center hangszóróból ad életjelet,természetesen minden rendben táp:OK, vizuálisan nincs eltérés púpos kondi stb.
Arra gondolok talán Factory Reset segítene csak eddig nem találtam,hogyan is van ennél a készüléknél ha valaki tudja annak nagyon örülnék.
Segítségeteket előre is köszönöm.
Üdv steewi
keresek stk 463 ic t.de már kifutott termék .
Szervusztok!
A címbeli egység hűtésével bajlódom. Pontosabban helyre kellene állítani a ventilátor vezérlését. Az alaplap ENH-213 jelű és a rajta lévő rommá égett R720 poz.számú ellenállás értékére, vmint a D720 poz.számú zener típusára lenne szükségem. Ez utóbbi láthatóan cserélt, a panel alján - bizonnyal egy "ügyes kezű pákász" által - vele párhuzamba kötött 20Ohm, 1/8W-os ellenállás volt. Ezért a ventilátor a bekapcsolást követő második perctől teljes fordulaton jár.
Az általam elért CA-MXG7BK SM. éppen csak ezt az egységet nem tartalmazza.
Segítő szándékotok megköszönném.
bencsik
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
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
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