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SONAB R-3000 STEREO RADIO PA SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
1.0 MB
Page
2
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    SONAB R-3000 RADIO PA R3000 STEREO 3000
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Relevant AUDIO forum topics:
Philips HTS513112 Soundbar -hoz értő szakit keresek
Philips HTS513112 Soundbar -hoz értő szakit keresek!
Torz, majd elhalkul.
Ismeri valaki? Tudja javítani valaki? Anyag?
Van hozzá a Tanyán Service Manual.
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
Autó erősítőbe tranzisztor helyettesítése.
Üdv Tisztelt mesterek! Segítséget kérnék. Javítok egy Rodek RI-4100 erősítőt. Egyik csatornába dióda lett egy tranzisztor. A tipusa C556B. Gondolom 2SC556B. Jaeger szerint: Si-N UHF,Drv 40/20V ,0.4A 850MHz.Tok TO39. Már ez nem stimmel , mert TO92 kis BC tokban van. Helyettesítőnek :2N3866 -t hoz, az sem jó , mer abban tranzisztor vizsgálóval egy dióda is van. Mi lenne ez és honnan szerezhető be? Sajnos nincs rajzom sem hozzá. Tisztelettel :Öreg Tom Üdv! A gép működik! BC557B lett betéve. Remélem hogy működni is fog. A társ csatornát is cseréltem, hogy egyszerre nyisson a két csatorna. Ezek lesznek a kisebb terhelésű ( szett) , és az az eredeti jó csatorna a Wooferé maradt. Kíváncsiságból megnéztem a végfok párokat. Hát ez bizony keményen párba van válogatva. hFE:89/90 TIP35/36 , másik cstorna : 88/89 Köszönöm mindenki segítségét. Tisztelettel: Öreg Tom
Ki ismeri fel ezt az magyar hangszínszabályzó modult? BEAG?
Üdv! A képen látható sztereo equalisert kaptam egy cimborámtól. Magyar gyártmány, a nyolcvanas évekből. Mivel két oldalas, furatgalvános, ónozott nyákja van, elég valószínű, hogy nem holmi kisipari tákolásról van szó, de nem tudom, hogy pontosan minek a mije is ez? 7db TL084 van rajta, és az összes jelölés mindössze egy "PCB23" felirat. Nagyra értékelném, ha valaki meg tudná mondani, hol keressem a kapcsirajzát, mert sajnos jópár Siemens kocka le van róla bontva, én meg, ha nem muszáj, inkább nem fejteném vissza az egészet csak azért, hogy kiszámolgathassam, hová, milyen kondi való.
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