Service manuals, schematics, eproms for electrical technicians
USSR LIRA.
Type: 
(DJVU)
(DJVU)Size
41.8 KB
41.8 KB
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1
1
Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
Sziasztok,
Segítségeteket szeretném kérni a címben említett eszközök összekötéséhez.
Mind két eszköz a sajátom.
Csatolok képet a két csatiról melyek összekötésére lenne szükségem.
Segítségeteket köszönöm.
Üdv.:
Gyula
Üdv az uraknak! Orion HS280-as hangfalhoz mélynyomó hol szerezhető? Javítja é valaki? Ki? Hol? Van egy szomszédom aki már minden lényeges helyen feljelentett. Gondoltam, adok neki egy kis zenét: Nina Hagen nyolcvanas évek beli punk zenéjét kissé megeresztettem, de mint tudjuk Isten nem ver bottal. Nos gondolt egyet a tekercs és leugrott az alumínium csőről. Minden megoldás érdekel. Roncs bontható hangfal, hangszóró, két fél hangszóró, amit össze lehet ragasztani. Bármi.
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.
A fenti minihifi nem kapcsol be, áramingadozás után.
A tápban 3 dióda zárlatos volt két bizti kiment, ezeket megcsináltam, de még mindig nincs életjel.
Ha vkinek volna rajza azt megköszönném, ha elküldené.
Attila
UI. tudom rajzot nem itt keresünk, de a helyén már próbáltam eredménytelenül, megpróbálom itt is hátha több siker lesz a vége.
Üdv.
Nincs senkinek tippje?
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