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[solved] FM Output problem


Marxon

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Hi Midiboxers,

after fixing my voltage issue, i still have a output problem :(

It is very low and there is a lot of background noise:

Testtone:

test.mp3

I allready checked:

5V @ Ic1 Pin 1,7; Ic2 Pin 1, 3, 6, 9

+12V @ Ic3 Pin 4; Ic6 Pin 4

-12V @ Ic3 Pin 11; Ic6 Pin 11

polarity of c1, c3, c5, c7, c11 ,c16, c18, c20 ,c22, c24, c26, c31, c32, c33, c34 = checked

replaced Ic3, Ic6 = no difference

FM-Interconnection test = passed

Any suggestions what could be the fault?

May some other capaciator?

Thanks for your help

Best regards

Marxon

Edited by Marxon
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Hi again :smile:

I was reheating every soldering when i noticed a missing trace on my board.

post-4098-0-65100600-1365511040_thumb.jp

post-4098-0-83636500-1365511053_thumb.jp

It is the 5v trace which goes to the bridge and from there to the rest of the board.

But like i said in my last post there was 5v on Ic2 Pin 1, 3, 6, 9

even without the missing trace?

So the new question is: where do the 5v come from?

Edited by Marxon
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