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USSR RP-202 RP-202-1 LEL.
Type: 
(DJVU)
(DJVU)Size
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23.0 KB
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1
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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USSR RP-202 RP202 RP2021 LEL. RP 202 2021 RP-202-1
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Relevant AUDIO forum topics:
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
Üdv!
A fent említett masina a leírtakon kívül semmit nem csinál. A neten található kézrátétes módokra nem reagál. Az 5 volton kívül semmi feszültség nem jut a készülékbe. Egy relén keresztül kap a nagy trafó tápot, ami nem , húz be . STBY sincs, tehát semmilyen rezet és más módok nem segítenek. Szemre, és mérve sem látni rendellenességet. Ha valaki tud valami trükköt, jó lenne ha megosztaná, mert megy bontóba, kukába, kár lenne érte. Köszönöm a figyelmet !
A fent említett masina a leírtakon kívül semmit nem csinál. A neten található kézrátétes módokra nem reagál. Az 5 volton kívül semmi feszültség nem jut a készülékbe. Egy relén keresztül kap a nagy trafó tápot, ami nem , húz be . STBY sincs, tehát semmilyen rezet és más módok nem segítenek. Szemre, és mérve sem látni rendellenességet. Ha valaki tud valami trükköt, jó lenne ha megosztaná, mert megy bontóba, kukába, kár lenne érte. Köszönöm a figyelmet !
Sziasztok!
Van nálam egy Aura VA-40 típusú végfok, aminek a javításával már próbálkoztak előttem, én úgy látom, hogy a probléma a végfetekkel van, J162 és K1058 páros van benne és a J162es feteket elég furcsának (rossznak) mérem. A kérdésem az volna, hogy tudja-e valaki, hogy a HQ-ban kapható J162-es fetek eredetiek-e illetve hogyan lehetne őket párba válogatni, hogy passzoljanak a jelenleg meglevő K1058-akhoz?
Sziasztok!
Egy Voice-Kraft 120/240W-os aktív hangfalhoz keresek mélysugárzót. Tudna valaki segíteni, hol lehet beszerezni? Az erősítő max. hangerején a nagy beütéseknél koppan egy éleset, olyan, mintha a lengő rész odaérne a mágneshez. Egyébként tökéletesen szól, ha kissé "halkabb".
Köszönettel
Attila
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