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Sziasztok, Elöregedett és szakadozott gumiszíjak pótlására kérek segítséget: szíjméretek, beszerzési forrás, stb. Egy fotót vagy rajzot is örömmel vennék az elrendezésről. Köszi Fand895

Sziasztok! Kapott egy túlfeszt és elszállt a két puffer kondi, meg a táp vezérlő SMD IC. Sajnos le van csiszolva a teteje. Két FET-t hajt meg. Van-e rajza valakinek? Mindenkinek köszi a segítséget, jó lett!

Sziasztok Kedves kollégák! A fenti erősítőhöz keresnék kapcsolási rajzot, a fégfokba szét égett egy két alkatrész, és ezeket kellene beazonosítani. Köszönöm előre is!! Csaba

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