Service manuals, schematics, eproms for electrical technicians
USSR NEIVA 402.
Type: 
(DJVU)
(DJVU)Size
19.4 KB
19.4 KB
Page
1
1
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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USSR NEIVA 402. 402
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Sziasztok!
a fent említett autós cd került hozzám javításra végfok ic felrobbant mert a tulaj beleejtett egy vékony rézszálat és pont a végfok 5 lábát összezárta.a gyári ic PAL 012A ilyet nem kaptam csak állítólagos helyettesítőt amivel megszólalt csak kb 1 perc után kiírja AMP ERROR.
valaki tudja hol tudok ilyen ic beszerezni vagy valami tényleges helyettesítőt?
előre is köszönöm!
Üdv Attila
Sziasztok!
Bocs, hogy a HiFi kategóriába került 
Kérdésem az lenne, hogy ha csak 5V-ról üzemeltetem, akkor a hangerő csökkenésén kívül romlik a vétele minősége is?
Felmerült, hogy powerbankról akarják táplálni, és kellene 5-ről 9V átalakító. Mivel 5V-ról is szól, gondoltam elég lenne csak egy USB kábel rá.
Jácint
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
Keresem a Philips 22rc200 gyári Peugeot autórádió Sm -ét.
és hogy ne írjak mégegyet MANIAC SOUND SYSTEM MNC INNOCD sm-ét is!
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