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KENWOOD RXD-M31MD LS-M31-M SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
4.1 MB
Page
42
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    KENWOOD RXDM-31MD LSM-31M RXDM31MD LSM31M RXDM 31 MD LSM RXD M31MD LS M31 RXD-M31MD LS-M31-M
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Kenwood KDC-3090R mindig ATT ON ír ki!
Sziasztok! Most került hozzám ez a készülék, bekapcsolás után szól rendesen. Egyszer csak elkezdi kiírni ATT ON, de ekkor meg le némítja a rádiót. Ezt ismétli folyamatosan, most átnéztem de semmi elváltozást nem találok benne. Merre keresgéljek az előlapban, vagy az alaplapján?
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
kenwoodKAC721
szervusztok ehhez a Kenwood KAC721 tipusu erositohoz keresek kapcsolasi rajzot, az a hiba,hogy nem kapcsol be,az alkatreszek nem zarlatosak, a neten sok KAC rajz van,de ez nincs... koszi a figyelmet
Kenwood KRF-V4060D lekapcsol.
Sziasztok! Nevezett készülék indítást követően pár másodperc után lekapcsol a védelem miatt. Több hiba is volt a masinában amit javítottam. 5V-os stabilizátor, 12V-os. "nagy táp" sem volt meg ami a graetz cseréje után helyreállt. Jelenleg már szimmetrikusak a feszültségek -12v/+12v ill. -40v/+40v (3-4 tízed eltéréssel) Végfokoknál sem találtam mérhető hibát, kimeneteken sincs egyen. Természetesen "földelés" összezárva. 3.3V és 2.5V is rendben. Hozzá(bb) értőktől kérdezném, miként lehetne kideríteni okát a védelem bekapcsolásának? Köszönettel: Kiss Z.
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