[Coco] Coco 1 displaying in B&W

[Vincent Tran]

The channel flipping works with the Genesis when it's hooked up, but doesn't with the coco.  I'll have to try reseating the MC1372 as suggested. Thanks.



> On Apr 18, 2015, at 4:46 PM, Rogelio Perea <os9dude at gmail.com> wrote:
> 
> On Sat Apr 18 2015, Vincent Tran wrote:
> 
> Hi -- Just got back from Radio Shack with a RCA male to RCA female and a
>> coax male to RCA Male coupler.  I plugged it up to the Coco 1 and the video
>> signal was definitely a lot better - there was no static like before when I
>> was using the Nintendo RF adapter.  Unfortunately, I still own a TRS-80
>> Black&White Computer.  Everything is still in B&W.  I tried both channels 3
>> & 4. Any other suggestions would greatly be appreciated.
> 
> With the advent of the digital tuner on TVs came the eventual disappearance
> of the 'fine tuning' control. The trick for that today is to have the
> channel where you are using with the CoCo be flipped up or down then back,
> digital tuners fine-tune this way. I have to do this often on the Samsung
> LCD flat I have on my workbench CoCo 1 when I power it up and sometimes
> when resetting it.
> 
> If the channel flipping does not help, as suggested by others try swapping
> the MC1372 chip, this is a 14 pin IC that does all the color mixing before
> feeding the RF modulator. I recently fixed a CoCo with wavy grainy video
> this way. Reseating the chips as suggested is also one of the first things
> to try.
> 
> -- RP
> 
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