Service manuals, schematics, eproms for electrical technicians
RUSSIAN GAMMA-V AM-FM RADIO-GRAMO 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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Good luck to the repair!
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Looking for similar russian manual?
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- Also known:
RUSSIAN GAMMAV AMFM RADIOGRAMO GAMMA AM FM RADIO GRAMO GAMMA-V AM-FM
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Relevant AUDIO forum topics:
Tisztelt Kollegák !
Kapcsolási rajzot keresek egy rendkívül fontos javításhoz.Persze a tulaj fontos
a készülék elég siralmas.Meg kell javítanom.Egyenlőre nem szól, de programozni
lehet.Tehát a tipus: Grundig prima boy 100 G.RG15 táskarádió
Segítségeteket nagyon köszönöm,
üdv. hanuman
Sziasztok az alábbi ic-t keresek AN-7325.neten nem találok sehol,valami tipp hol keressek?
érdekel komplett hifi is.
előre köszi
üdv ..
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
Hozzájutottam 2-db REMIX Végfok ic hez.
Az adatlap is van hozzá.
Két dologra nem derül fény és lehet hogy
használt már valaki és képben van.
Az egyik az Ra erősítés változtatás számítása.
A másik érdemes foglalkozni vele?
Üdv Kiss
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