Service manuals, schematics, eproms for electrical technicians
RUSSIAN BALTIKA M-254 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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RUSSIAN BALTIKA M-254 M254 RADIOGRAMO 254 RADIO GRAMO
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Relevant AUDIO forum topics:
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!
Nem érzékeli a lemezt ez a házimozi, bekapcsoláskor megforgatja egy pill., de le is áll, a fej mozog és fókuszál közben.
Tisztítás után sem lett jobb, a potikon próbáltam állítani picit, egy állásnál elindul a lejátszás de szaggat, szerintem fejet kéne cserélni csakhogy nem találok sehol.
Ezek vannak rajta: CY6AA33C9B2 3247246AG
Hol lehetne a beszerzéssel próbálkozni?
Sziasztok!
A segítségeteket szeretném kérni. Ebben a készülékben szeretném kicserélni a hangoló potenciométerek egyikét (P1), mert megszorult. A vége, amire a hangoló műanyag rész kerül már teljesen simára kopott a sok próbálgatástól. Amennyiben jól tudom 100 Kohm az értéke. Ötlet, hogy hol lehet venni, beszerezni, kapni? Bontott készülék is érdekel tartaléknak.
Előre is köszönöm:
Alfonz
Üdvözletem tisztelt Mesterek.Egyre többen érdeklődnek hogy gyári CD tár helyett lehet e USB vagy SD kártyát csatlakoztatni vagy mi a megoldás?Már láttam ilyen gépt,de én balga az ügyfél számát elveszítettem.Sokan a gyári gépet nem akarják cserélni, de a kazetta már elavút , a CD tár meg 50-100 Ez.Ft. És mindig csak CD. Amit említettem az SD-kártyás volt. Öreg Tom
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