Service manuals, schematics, eproms for electrical technicians

USSR NEIVA.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
24.5 KB
Page
1
Category
AUDIO
SERVICE MANUAL
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Relevant AUDIO forum topics:
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
mozigép erősítő valaki közelebbit róla?
Sziasztok! Kaptam egy (vélhetően) mozigép erősítőt. Nem lehet túl régi, végcsövek el84 párban, egyenirányító ez80. Tud hozzá valaki típust, milyen gépben lakhatott korábban? Köszi!
Samsung PS-WJ450 mélynyomot hogy lehet szétszedni!
Sziasztok!
Most került hozzám hogy nagy hangerőnél világít mind a két led, és nem szól, de visszakapcsolva is előjön ez a hiba. Minden csavart kiszedtem amit találtam, de szétszedni nem lehet, mit kellene még leszedni róla, hogy szétszedhető legyen?
PANA SA-AK220 hifitorony
Sziasztok! Ez a pana hifi azt csinálja, hogy a kijelzőn jelzi a hangerőt, meg hogy szól a hifi, de hang nem jön ki belőle, és a végfok bemenetén sincs hang. Van valami típushibája ennek a toronynak, ami ezzel kapcsolatos?
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