[Coco] Audio Noise Coco 1 87009285 board

[Kevin Becker]

My MC-10 has a similar issue so I’m curious if you find the solution. 

- Kevin


> On Jan 22, 2019, at 9:36 PM, Carlos Camacho <idevgames at gmail.com> wrote:
> 
> Working on a Coco 1... the one that Paul did the cost measure to. Always
> forget the name of the board. It's number is 87009285. Ala the L shape
> board.
> 
> Ok, so this machine has terrible noise. The noise tends to build up.
> 
> On the bottom of the board, it looks like pin 3, the sound track lifted up.
> So last owner has a jumper from pin 3 to under the tape and serial din.
> Following now on the top of the board, it seems to go to the relay. If
> that's correct, it's far different from the tech book.
> 
> Resting brings the noise back down but it sound comes back. I have a new RF
> modulator in the machine.
> 
> Thanks
> Carlos
> 
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