Service manuals, schematics, eproms for electrical technicians

BOSS SP1

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    BOSS SP-1 SP1 SP
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Relevant AUDIO forum topics:
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
Fülhallgató kimenet :)
Sziasztok! Lenne 1érdekes kérdésem. Hogyan lehet megoldani,hogy egy autós fejegységről, olyan jelet lehessen levenni, amit lehet fülhallgatóval hallgatni menet közben?? :) ..egy ismerősön, a trakiban akarja így hallgatni, és v.hogy kikellene vezetni egy jack-ajzaton keresztül. Csak nem tudom, hogy milyen osztással lehet ott jelet letenni az erősített kimenetről? ..egyáltalán lehet -e így megoldani. Bármilyen javaslatot köszönök!!
JVC CA-MXS2BK hifi nem kapcsol be! Se kép se hang. A kijelzö sötét.Készenléti led se világít.
Üdv mindenkinek. Kérnék egy kis segitséget a "szakiktól" Van egy JVC CA-MXS2 hifim a mi egyik napról a másikra meg adta magát.Se kép se hang. Szétszedtem és a trafo melletti panelben bemértem pár alkatrészt.
D 542 = 33v
D 541 = 32.5V
D 539 =33.7 V
D 540 = 33.7V
D 582 =24V
D 583 =24V
D 584 = -10V
D 581 = -30V
D 580 = -30v
D 585 = -4.2V
D 587 = -12.7V
D 577 = 16.1V
D 575 = -8.9V
D 536 = NINCS ÁRAM
D 561 = NINCS ÁRAM
C 582 = 24.1V
C 583 = 23.5V
C 538 = 33.5V
C 539 = 33.2V
C 571 = 1.9V
C 575 = -0.9v
A sárga Matsushita relé  33vot mértem. De a 3 ellenálláson  0 voltot mértem. Szeretnék segitséget kérni hogy hol lehet a hiba. Nagyon jó kis hifi, már több mint 10 éve megvan.
Elöre is köszönöm a segitséget. Itt található a  kapcsolási rajz PDF-be, de ide nem tudom feltölteni,mert 13mb-tos.
jvc mx-ka33 hifi
Sziasztok. Az lenne a kérdésem hogy a fent nevezett hifihez van-e valakinek magyar használati utasítása. Ha van akkor azt megköszönném.
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