Service manuals, schematics, eproms for electrical technicians
KOERTING S 3400 3405 W WL G WL RADIO 1933 SCH
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar koerting manual?
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KOERTING WL RADIO 3400 3405 1933
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Relevant AUDIO forum topics:
Demand:Prosím Vás, máte na predaj tento vyhorený plne funkčný pohotovostný zdroj k onkyo TX-NR727 na Slovensku. Dakujem Minko.Poprosim a foto.Urgentne.
https://mail.google.com/mail/u/0/#inbox/DmwnWtDsVgFgtSxMCkwLfVxfzbmbCrWVcxxFsfCLSxZBprvlGtmLKJcDJdRvvPWSXFtRjlhJvpZb? projector=1&message. EMAIL: milan.gebrlin@gmail.com
https://mail.google.com/mail/u/0/#inbox/DmwnWtDsVgFgtSxMCkwLfVxfzbmbCrWVcxxFsfCLSxZBprvlGtmLKJcDJdRvvPWSXFtRjlhJvpZb? projector=1&message. EMAIL: milan.gebrlin@gmail.com
Jó napot tanyalakók!
A címben említett aparátussal lenne gondom.
Nagy alapzúgást generál bekapcsolás után. Hol keressem a bajt?(az audio téren nem vagyok annyira otthon)
Előre is köszönöm a válaszokat!
A címben említett aparátussal lenne gondom.
Nagy alapzúgást generál bekapcsolás után. Hol keressem a bajt?(az audio téren nem vagyok annyira otthon)
Előre is köszönöm a válaszokat!
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. Segítséget kérek! Egy sharp sx 8800 H erősítő hibás!
a hibája hogy van A+B oldal meg még 2 külön álló oldal
na most az A+B oldal úgy szól ha csak az A ra van kötve vagy csak a B re a kettő együtt nem szól
a külön álló oldal meg egyáltalán nem szól
ami okozhatja IC STK 4050 H 2DB van benne
meg egy tranzisztor de nem tudom kimérni őket mert nem tudom az értéket hogy mennyinek kell lenni-e
Képek: http://kepfeltoltes.hu/120225/IMAG0073_www.kepfeltoltes.hu_.jpg
http://kepfeltoltes.hu/120225/IMAG0074_www.kepfeltoltes.hu_.jpg
http://kepfeltoltes.hu/120225/IMAG0076_www.kepfeltoltes.hu_.jpg
Válaszokat előre is köszönöm!
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