Ehhez a gitár erősítőhöz keresek valamilyen leírást,egyáltalán mit csinál.Az erősítésen kívül milyen funkciói vannak.Esetleg némi dokumentáció is érdekelne.Bármilyen segítséget szívesen vennék.
Hello !
Van egy JVC XT-MXG7BK hifi berendezésem amelyik némasági fogadalmat tett oly annyira hogy egy zörej egy reccsenés de annyi sem jön ki a torkán , minden működik minden állítható rajta csak hang az nincs egy gramm sem (hangszórók működő képesek !) , merre keresem a hibát igaz rajzom sincs ami alapján kutakodjak .
Ha valaki tudna segíteni vagy tanácsot adni azt megköszönném .
Sziasztok!
Keresném a subbelit. Ha valaki tudna forrást, kérem keressen a vadmalacka.gmail.com -on
Köszönöm.
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?
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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.
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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?
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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.
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Thanks for reading this. Many thanks in advance, and have a peaceful Palm Sunday! :taps2:
Bellarmine