Service manuals, schematics, eproms for electrical technicians

QSC EX2500.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
45.9 KB
Page
2
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    QSC EX-2500. EX2500. EX 2500
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Receiver Denon AVR1311 starts On and after 8 seconds shut down automatically...
Hello everybody, This receiver starts normally and has a nice blue display lighting on for 8 seconds. Suddenly you ear the main relay falling down and everything turns off and you get the red led flashing around the main power switch button. There is no special code with this continuous flashing rythm of the led. I have no diagram of the device and I have opened it and measured the voltage on pin 4 of the voltage regulator KIA78R05P1, which has a validating signal on his pin four.(2 is the output and 3 is frame (-)).this 5V(to-220)monolithic 7805 regulator is on the main PCB, close to the little transfo and ON/OFF relay...and is mounted without any heat dissipator(I was surprised of that fact!).the voltage between(4-3)is 1,88V dc and never climbs up during the starting sequence. Can you help me to solve this problem?
STAGG PGT-007G mikrofon
Üdvözlet ! Segítsséget illetve rajzot szeretnék kapni a fent említett mikrofonhoz azt már kiderítettem ,hogy fantom tápról működik valami tranzisztoros elektronika van benne, 3-4 színes huzalok leszakadva. A panelra hova kössem? Előre is köszönöm. Geza682.
PANASONIC SA-AK220 csak a CD-n van
Üdv!

Szíjakat cseréltem eme szerkezet magnójában. Azóta ha bekapcsolom csak rápróbál a magnó motorra és CD-n marad. Nem tudok TUNER-ra és TAPE-ra váltani. Nem nyitja kazetta ajtókat se, se a CD tálcát..
Akkor is ez van,  ha lekötöm a CD-t róla.
Mi lehet?

Kösz
Wega jps 351-130 hibajelenség
Sziasztok!
Hibásként vásárolva hozzá jutottam az erősítőhöz , a hibajelenség hogy bekapcsol, de nem szól. Odáig eljutottam hogy gyanús volt az egyik Sony cx171 ic, mivel az egyiket kivéve bekapcsol és szól is, sőt fel is cseréltem , az egyik IC  valószínűleg hibás, viszont ha hozzáérek az IC egyik lábához akkor a relé kapcsol és addig működik amíg el nem engedem az a bizonyos pontot. Kérdésem hogy ennek mi lehet az oka?
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