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MAGNAVOX AIR PRINCE-43U 1942 SCH
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AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
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Looking for similar magnavox manual?
Good luck to the repair!
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Looking for similar magnavox manual?
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MAGNAVOX AIR PRINCE-43U PRINCE43U 1942 PRINCE 43 43U
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Relevant AUDIO forum topics:
Kérem, Harley-D, m_stuart és kozak_g, ne szóljon a topic -hoz!
Sziasztok!
Megtaláltak egy ilyennel. A erősítő része jó, a 100V rész nem megy.
A trafó meg szokott halni? Hogyan tudnám ezt tesztelni?
Sziasztok!
Megtaláltak egy ilyennel. A erősítő része jó, a 100V rész nem megy.
A trafó meg szokott halni? Hogyan tudnám ezt tesztelni?
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!
Vettem egy 12"-os hangszórót. Az eladó annyit tudott, hogy a SAL-tól vette gitárerősítőbe, de semmi jelölés nincs rajta. Van-e valami módszer arra, hogy károsodás nélkül megtudjam, mekkora teljesítményű lehet?
Üdv: Jácint
Néhány méret:
A külső perem 300mm, a beépítési nyílás 275mm, teljes magassága 120mm, a mágnes átmérője 140mm, vastagsága 30mm. Fekete membrán.
Üdv Urak!
Thomson cs-700 hifihez keresek távszabályzót. A sininél van, de annál "olcsóbb" kellene...
Segítséget köszönve: FEJO
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