Service manuals, schematics, eproms for electrical technicians

QSC RMX850

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
385.5 KB
Page
3
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    QSC RMX-850 RMX850 RMX 850
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
SHERWOOD R-725RDS
Hi mindenkinek! Eme szörnyeteg kapcsolási rajzát keresem, közel annyi alkatrész van benne mint az USS Enterprise űrhajón ami nem is lenne baj ha működne:). Fél nap potyára guglizás után gondoltam még itt megpróbálom, hátha valaki épp egy ilyen dokumentumot őrizget. Előre is Köszi. Üdv.
dj cd mod.
az lenne a kérdésem hogy hogyan lehetne egy dupla dj cd játszoba (Pl gemini) belebuherálni két darab vinyot, akár a cd-k helyére is, vagy mellé. nem az a kérdés hogy hogyan nem lehet megoldani, hanem az hogy hogyan lehet. vagy egy másik alternativa, a cd olvasokat alkalmassá tenni a dvd lemez, mint formátum olvasására. tudom hogy ez nem egyszerü. ha az lenne már megoldottam volna. de itt vannak olyanok akik otthon vannak ebben a témában, nem ugy mint én megrögzött analog. elöre is köszi.
Kenwood KA-3500 Integrated Amp BIAS Adjust
Hello, Last week I picked up a nice Kenwood KA-3500 40watt intergrated amplifier in pretty good shape. Upon using it a bit more, I noticed a bit of distortion at high volume, more so in the left channel. I checked the DC offset at the speaker terminals, and the L channel said 100 mV, while the R was 25 mV. I understand this isn't so good for the L channel at least, but unfortunately this amp doesn't have any DC offset adjustments. Am I right in saying that to fix this I'd have to replace the output transistors? -- On a related issue, in the service manual I found the section on BIAS adjustment, and I read online how it can affect the DC offset. So I hooked up my voltmeter to the test points, and I got 4 mV on the L, and 8 mV on the R. In the manual it says should be 40 mV.....(!). Is there something wrong here? I tried carefully adjusting them, but they only go to 30mV with the pots fully on, this doesn't seem right to me. -- I compromised at 20 mV BIAS for both channels, and now the DC offset is 50 mV for L, and 5 mV for R, which is better, less than half what they were. I'm wondering, will I damage anything doing this, should I put them back to where they were? -- The service manual is on site here. Let me know if you want me to upload an english copy of the Owner's Manual, it has a better schematic in it all on one page, easier to read. I've also included some pictures. They're not my actual unit, but mine is exactly the same, but less dusty. -- Thanks for reading this. Many thanks in advance, and have a peaceful Palm Sunday! :taps2: Bellarmine
Philips MC-70/22 kikapcsol, teljesen leáll.
Üdv!

A címben jelzett mini hifin STBY van, viszont bekapcsolás után a hang megszólal majd teljesen leáll.  Semmivel nem indítható a következő feszültség alá helyezésig.  3cd-s  1 fiókos rendszer,a hibát eleinte csak néha adta elő, mostanra viszont teljesen kuka lett.  A cd része eléggé viharvert, elképzelhető, hogy nem áll pozícióba ezért old le?  Hibát nem ír, jelöl.  A gumik már rég elnyúltak benne, ezért nem gondolnék erre de hátha mégis.  A tápjai jónak tűnnek,  semmi nem melegszik, ami még érdekes, hogy stby-ban is megy a ventilátora.  Ha esetleg valaki ismeri a gépet és tudna némi infót, megköszönném.  Köszi a figyelmet !
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