Service manuals, schematics, eproms for electrical technicians
LEAK STEREO70
Type: 
(PDF)
(PDF)Size
5.3 MB
5.3 MB
Page
17
17
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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- Also known:
LEAK STEREO-70 STEREO70 STEREO 70
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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
Kedves kollégák!
Szert tettem egy fent nevezett kínai csodára...nagyon pofás kis erősítő, egyszerű kapcsolás. Szemre olyan 5-600W-os toroid, kicsi hűtőborda, két venti.
Problémám az, hogy a ventik nem kapcsolnak be.
Van a bordákon két hőkapcsoló. az egyik egy NC-állású, ez a védelem reléjét oldja, ha túlmelegedne (szerintem olyan 60-70C-fokos lehet...).
A másik egy NO, ez akkor kapcsolná be a ventiket, ha már érezhetően melegszik a borda... Na ez az ami nem működik.
Kérdésem az, hogy honnan lehet ezeket beszerezni??? mi a nevük???
kb.12-14mm átmérőjű 10mm magas henger, hátán két faston-saru... egy tojás alakú gyűrű segítségével, két csavarral rögzíthetjük. (olyan, mint pl. a kávéfőzők hőkapcsolója...)
cél, hogy 30-35C -on kapcsoljon be,12V-on,max 1A-t.
Előre is köszi a segítséget!!!
stonhy
Segitségre lenne szükségem kaptam egy philips 70fr 330 erősitös rádiot,de hiányoznak belöle a végfok tranyok.Ha valaki tudja segitsen.Elöre is kösz.
Googliban kerested már?
Sziasztok!
Keresek 3db relét a fenti ARM-hez.
Üdv SuPeti
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