Service manuals, schematics, eproms for electrical technicians

KENWOOD KRF-X7775 VR-5080-5090

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
11.0 MB
Page
68
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    KENWOOD KRFX-7775 KRFX7775 VR50805090 KRFX 7775 VR 50805090 KRF X7775 5080 5090 KRF-X7775
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Relevant AUDIO forum topics:
Kenwood KRFV5030D
Fent nevezett készülékem önálló életre kélt. Bekapcsolás után magától váltogatja a bemeneteket majd megáll. Az lőlapon hol működikon hol nem a hangerő gomb, a bemenet váltó gomb és a multi kontroller a többi gomb jó, a távirányítóval viszont mindent lehet szabályozni. Van valakinek valami ötletet mi okozhatja ezeket a hibákat."táp" "proci" A mikró-kapcsolók átvezetését már le ellenőriztem azok jók.
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
Kenwood hibakód
Üdv mindenkinek! KDC-W312 tip. cd-rádió E-99 hibakódot produkálja.Nem pörgeti a lemezt olvasáshoz. Merre induljak! Szép estét mindenkinek!
Kenwood vr-505120120V 60Hz hogy tudom használni itthon? MEGOLDVA
Tisztelt Szakik! Egy ismerősöm fordult hozzám ezzel a kéréssel, hogy milyen módon (módokon) lehet ezt itthon beüzemelni. Kiindulási alap hogy a legegyszerűbben és a legolcsóbban.(meg persze legyen üzembiztos) Ehhez kérnék tippeket. Amerikai eredetű készülék, 120V 60Hz, rajza a itt a tanyán, 13 oldal a táp rész. Köszönettel D A
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