Service manuals, schematics, eproms for electrical technicians
TANDBERG TCD420A SM
Type: 
(RAR)
(RAR)Size
1.7 MB
1.7 MB
Page
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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TANDBERG TCD-420A TCD420A TCD 420
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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
Fenti 1 lemezes régi nissan cd tár kódot kér. Van esetleg hozzá kalkulátor? Gyári számot még megtudakolom.
Előre is köszi.
Kollegák a fent nevezett AX570 erősitől szeretnék kapcs rajzot
valaki már turkált benne és a c101 c102 kondit cserélte bipolárisra
a panel jelölés szernint elkorol van szó.
Ha valakinek lenne ötlete vagy doksija akkor kérem segitsen.
Köszönettel Muskovits Zoltán
muskovits.z@freemail.hu
sziasztok mindenkinek
Javitásra van nállam egy pioneer A 80-as erösitő olyan baj van vele, hogy a vezérlőpanelről valami zajszint kerül a vékfokra és melegedik.Keresek olyan progit ami a pc audiokártyájáról tud egy 1 kh-es jelet kiadni.igy tudom szkoppal mérni a jelet és remélem hogy meg is csipem a zajt valahol
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