nakamichi cd500 schematic & manual service

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Hello my name is david I am from spain and I am going to explain my problem.

I had my car audio system complete but one day I changhed my amplifier for another one and when I turn on the radio, sorprise, there is a noise. You can listen one (shLLLLLL....) at low volumen, at high volumen the music cover it, and when you pass the sings or carpets you can listen load noise.

I test my installation and all its ok, I test wiht other radio and there isnt nosie, for this reason I think that its my radio pre-out 100% .

I need schematics & service manuals of my nakamichi cd500, because I dont have much money to reapir at official service and I studie electronic.

Thanks you from spain and sorry for my englis.
 
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