Service manuals, schematics, eproms for electrical technicians
MONTARBO 801
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2.1 MB
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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MONTARBO 801
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Relevant AUDIO forum topics:
Udv mindenkinek.
Keresem az Universum VTC-CD4007 tipusu hi-fi kapcsolasi rajzat.Ugyanakkor a segitsegeteket is szeretnem kerni.A fent emlitett hi-fi hangero es hangszin szabalyozolya nem mukodik.A TDA7440D IC tartalmazza a jelforras valasztot (ez a resze mukodik),valamint a hangero es hangszin szabalyozot,utobbiak nem mukodnek.A szabalyozo SDA , SCL jeleket megkapjak mert a jelforras valaszto mukodik.A TDA7440D ic-t kicsereltem,tapfeszultseget kap.Tanacsotokat varom.
Attila.
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
sziasztok!
aiwa nsx-d 636 mcenter cd részének rajzát keresem.
köszönettel!
sion
ÜDV MINDENKINEK! a fent említett erősítő került hozzám javításra,házibuli során el füstölt! végfok tranyókat mind ki vettem ki mértem mind jó! át mértem szinte minden ellenálást nincs szkadás sehol biztosíték is jó bekapcsolom és semmi életjel a hálózati trafója égett le 220-at fel veszi de primér oldalon semmi nem jön ki és abba szeretnék segítséget kérni hogy mijen trafót tudnák bele hejettesíteni mert nem tudom hogy mekkora feszültség jóhetett ki rajta a puffer elkók 6800uF 56V -osak nem távos! 2X hány voltos lehetett a trafója?? fel teljesítménye 260W.minden segítséget szivesen fogadok!!
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