Service manuals, schematics, eproms for electrical technicians
LESLIE COMBO-PREAMP-2.
Type: 
(DJVU)
(DJVU)Size
71.3 KB
71.3 KB
Page
4
4
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Good luck to the repair!
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LESLIE COMBO PREAMP 2.
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Relevant AUDIO forum topics:
Hi!
Az említett erősítő megadta magát, még a relé sem húz be.
Szervízoldalakon láttam a tipikus hibajavítási ötletek között ezt a "relé nem (sem) húz be" problémát, csak sajnos nem férek hozzá.
Valakinek esetleg ötlete, tapasztalata?
Nagyon köszi!
Üdv!
Lenne egy ilyen zenedoboz.
Megy rajta minden, a de a kijelző halott.
Innen leszedtem a manualt, de csak blokkséma meg a nyomtatott áramköri rajzok vannak benne.
https://www.manualslib.com/manual/2438663/Sony-Mhc-V71.html?page=2#manual Találkozott már ilyennel valaki? Kösz
Lenne egy ilyen zenedoboz.
Megy rajta minden, a de a kijelző halott.
Innen leszedtem a manualt, de csak blokkséma meg a nyomtatott áramköri rajzok vannak benne.
https://www.manualslib.com/manual/2438663/Sony-Mhc-V71.html?page=2#manual Találkozott már ilyennel valaki? Kösz
üdv mindenkinek: keresném ennek az autórádiónak a rajzát
A rádió szól, végfok alig langyos, a többi IC sem meleg.
Hibák:5 percenként kikapcsol, majd vissza,2 SD 2058 nagyon melegszik
Előlapon nem látszik a kijelzés, csak kéken világít. Hangolható, gombok vakon működnek.
5 V, 9 V van,3,3-at nem találok.
A flat kábel jó,kimérve,de szkóppal nem látok jelet.
Az egész átforrasztva,melegítve, fagyasztva.
Bálint
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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