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HALLICRAFTERS, INC. C502 C512 C504 C514 SCH

AUDIO - SERVICE MANUAL
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71.4 KB
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2
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    INC. C-502 C502 C512 C504 C514 502 512 504 514
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Videoton RA6363S Javításhoz kérnék egy kis segítséget.
Sziasztok! Minap került hozzám egy a címben említett "csodabogár". A hibája az volt, hogy a jobb oldal nem szólt. A végfok az alábbi alkatrészek cseréje után megszólalt (működik). VT17 BC337 VT19 BC546 VR34 82ohm VR47 4,7ohm VR39 0,47ohm 5w VR40 0,47ohm 5w Na már csak annyi hibája van a jobb oldalnak, hogy hallhatóan egy kicsit halkabb + jóval kevesebb mély van mint a bal oldalnál. + Úgy voltam vele, ha már nálam van akkor átnézem. A másik hibája az pedig, hogy egyig LED sem világít. A ledeket egyesével kipróbáltam. Jók! Az MIC05 (LM324) és a MIC11 (U237B) megkapják a 15v-ot. Az alábbi 2 hiba felderítésében kérlek titeket 1-2 jó tippre, hogy miket nézzek át. Sajna oszcilloszkópom az nincsen. :( Köszönöm!
RCF art 415-A speaker - PSU not working
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

 
KÉRDÉS.
Volna egy nagy kérdésem. Van 1 Panasonic SA-AK200-as mini hifim. És olyat csinál hogy bekapcsolom szól kb:1percig és kikapcsol. És ilyet ír ki hogy F61 vagy FG1 a kettő közül valamelyik. Nem tudja valaki mi lehet a baja? Várom a válaszokat. Előre is köszi.
Laney WS 80R erősítő
Ehhez a gitár erősítőhöz keresek valamilyen leírást,egyáltalán mit csinál.Az erősítésen kívül milyen funkciói vannak.Esetleg némi dokumentáció is érdekelne.Bármilyen segítséget szívesen vennék.
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