Service manuals, schematics, eproms for electrical technicians
GIBSON EA-7P PROFESSIONAL SCH
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614.3 KB
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Looking for similar gibson manual?
Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar gibson manual?
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- Also known:
GIBSON EA-7P EA7P EA 7P
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Relevant AUDIO forum topics:
T. !
A készülék szíjai elszakadtak.
Elég bonyolult a mechanikája.
Hogyan lehet a legegyszerűbben kicserélni ?
Ha valakinek van tapasztalata, kérem jelezze.
Köszönettel,
gergosz0
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
Kedves tanya lakók! Tudnátok a fent emlitett gép végfok ic pontos tipusát?? és hogy mivel tudnám hejettesiteni mert sajnos igy került hozzám hogy az ic hiányzott belőle! előre is köszönöm.Zsolt
Tiszteletem mindenkinek!
Egy FM tramszmitterrel kapcsolatban szeretném a véleményeteket megkérdezni.
Vettem használtan egy Soundfly SD GWT-500 típusút.
Működik de elég hervadt a hangja. Jól hallható az alapzajt, sistergést, sercegést lehet hallani, és talán a teljesítménye is kicsi,
mert ha kézzel közelítek felé nő a sistergés a rádióban. Ezelőtt egy régebbi KÖNIG gyártmányút használtam aminek ilyen jellegű
hibái nem voltak de a kevés szolgáltatás miatt cseréltem ki. Azt szeretném kérdezni hogy aki használt már ilyet mit tapasztalt?
Ha gyárilag ilyen milyet javasoltok? Előre is köszönöm az esetleges válaszokat Majzinger
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