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CHALLENGER MODEL AC220 SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
5.4 MB
Page
5
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    CHALLENGER MODEL AC-220 AC220 AC 220
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Relevant AUDIO forum topics:
BOSE QC35 bluetooth fejhallgató
Üdvözletem!
Kérdezem, tudja-e valaki, hogy ebben a fülesben hány akku van, oldalanként egy-egy, vagy csak egy?
Köszönettel gtamas
Gitár előerősítő
Sziasztok! Vettem egy elég régi gitárt. Két pickup van benne, semmi más. Szeretnék beépíteni egy előerősítőt, hangszínszabályzóval, torzítóval, ami 9V-os elemmel működik. Ehhez kérnék kapcsolási és nyákrajzot. Előre is köszönöm! Üdv.: Péter
PANASONIC SA-PM 18 BI - AMP HIFI - hangfal rákötési probléma.
Üdv mesterek. Egy  ismerősnek/kollégámnak  kérnék segítséget. Vett egy a címben szereplő hifit, de hangfal nélkül. Otthon  vette csak észre.hogy  nem 2 pár ha nem 4 pár  vezetéket kell rákötni.Külön a magast és külön a mélyet.
A kérdés .hogy egy sima 6 ohmos hangfalat rá lehet kötni? Vagy át kell alakítani a hangfalat . Úgy , hogy külön-külön  vezetékelni kell a magas, és a mély hangszórót?
köszönöm a segítséget.
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
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