Service manuals, schematics, eproms for electrical technicians

QSC PL18

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
873.0 KB
Page
6
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    QSC PL-18 PL18 PL 18
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Toyota Navi/rádió/cd/stb... Mi a típusa?
Üdv! Egy Toyota integrált csodaketyere azonosításában kérném a segítségeteket. Így néz ki: A bele: Elméletileg van benne navigáció, CDlejátszó, rádió, kártyaolvasó, usb csatlakozó, stb... Nem tudom ez minek számít, autórádiót mondani rá picit erős. :) Szóval nincs rajta semmiféle típusjelzés, se az elején, se a hátulján. Itt a tanyán van vagy 100 toyota doksi, érthető módon nem kívánom végignyálazni egyesével. Ráismer valaki erre? Mi a típusa? Előre is köszönöm, DM
LG XC 102 Hi-Fi torony "PROTECTION" módban (és nem) indul el...
Szép estét mindenkinek! A fenti üzenet jelenik meg bekapcsoláskor a kijelzőn és nem reagál semmire. Kérdésem: valakinek van-e ötlete, hogy lehet ezt megszüntetni? A válaszokat előre is köszönöm!
SA-AX710 erősítő
A fenti Technics házimozi erősítő hangfal nélkül nulla meghajtás mellett is időről időre overload hibakiírással lekapcsol. a végfokok enyhén melegszenek. Valószínűnek tartom az egyik végfok ic haldoklik beszerezhető ez egyáltalán? RSN33S5-P
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

 
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