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UAV mod on 6 Switch colors are off

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Hi.  So I just finished installing a UAV mod in one of my 6 Switch Atari 2600s and the colors are super bright, and just don't look right.  I lifted pin 6 on the TIA and all of the wirres are attached exactly as pictured in the instructions.  Is there an additional step that I missed?  Thanks!!

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Photos of your installation and your display showing the the “super bright” output might be useful to help diagnose. It’s been Byan’s suggestion to lift pin 6 to remove the 820 ohm saturation boost resistor from the signal since the early days of the first public UAV, the rev C.

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Hi.  Here are pictures of what I have so far.  Lifted pin 6 (checked without it lifted and got only black and white and crazy lines when in color mode). The background green is super light compared with the usual green you’d get.  Thanks!

008799F5-438E-4469-B7DE-D671CDE79440.jpeg

A405F787-0182-4994-BF86-DBBBDE0613A6.jpeg

853F8A03-B585-47DF-9070-9B65B81508D9.jpeg

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Color saturation looks pretty accurate to me. I think you just need to tone down the brightness on your TV.

 

Wait..I've not installed one of these in a 2600 yet, but why would the COL in need to be wired when there is already a separate color input for the TIA near the main ground? Is that where the 2600 colorburst line should be attached where it says T. COL? That is where we attach it on the 7800.

 

 

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39 minutes ago, -^CrossBow^- said:

Color saturation looks pretty accurate to me. I think you just need to tone down the brightness on your TV.

 

Wait..I've not installed one of these in a 2600 yet, but why would the COL in need to be wired when there is already a separate color input for the TIA near the main ground? Is that where the 2600 colorburst line should be attached where it says T. COL? That is where we attach it on the 7800.

 

 

Here is the same tv displaying Pitfall via composite from a 4 Switch I did.  I believe the T. COL is only for the 7800, and not used with the 2600.  I did not use it when I installed the UAV on the 4 switch.  

BCC262A8-44A6-4A26-95A0-A92426848E47.jpeg

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Well that seems odd that T. COL is only used on the 7800 since that literally stands for TIA color and the other COL is for the Maria colorburst?

 

Just out of curiosity, what happens if you connect that line to T. Col instead?

 

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TCOL is only used for 7800 installations. COL input is the proper input for a 2600. As @-^CrossBow^- says, saturation looks fine here. You can tweak the color pot a bit to get better differentiation between shades of green/yellow in the bottom half of the playfield but that may be about the best you can get.

 

1 minute ago, -^CrossBow^- said:

Well that seems odd that T. COL is only used on the 7800 since that literally stands for TIA color and the other COL is for the Maria colorburst?

This was added for 7800 installations in rev D of the UAV. Prior versions didn't have a separate input for TIA color and people found it confusing to install in 7800's. COL in on the terminal block should be fine for UAV installations in a 2600.

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14 minutes ago, -^CrossBow^- said:

Well that seems odd that T. COL is only used on the 7800 since that literally stands for TIA color and the other COL is for the Maria colorburst?

 

Just out of curiosity, what happens if you connect that line to T. Col instead?

 

Here is the color going into the T.COL instead.  

71047BB8-CD4B-4E32-9013-0CD149590B80.jpeg

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13 minutes ago, DrVenkman said:

TCOL is only used for 7800 installations. COL input is the proper input for a 2600. As @-^CrossBow^- says, saturation looks fine here. You can tweak the color pot a bit to get better differentiation between shades of green/yellow in the bottom half of the playfield but that may be about the best you can get.

 

This was added for 7800 installations in rev D of the UAV. Prior versions didn't have a separate input for TIA color and people found it confusing to install in 7800's. COL in on the terminal block should be fine for UAV installations in a 2600.

Interesting.

 

As I said, I've not installed or had a need to install a UAV into a 2600 since most people are content to use their 7800s for both. I thought the resistant values and such were different between these color bursts though? I know they are on the Sounby and Magic Knight installs so you can't mix them up when running those lines. Still curious to know what it would look like if one were to use the T. COL... gonna make me test that this weekend I guess LOL!

 

And that gets answered as I was typing this LOL! Well, that certainly doesn't look right no. I'm guessing the other components in the mix on the 7800 is the reason here. Mushroom effect there... 

 

In looking at that pic...aside from the rainbow bright puke in the center, the rest of it looks on point as far as the colors, saturation, and brightness though.

 

 

 

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Now I'm curious - I've got a rev C in my 2600 and one of my 1200XLs, and rev D's in another 1200XL, my 1088XEL, my 1088XLD, my 5200 and my 7800. I need to open one of the machines with a Rev D's and see if they share a common lead. It was my understanding - perhaps incorrect - that COL and T.COL shared a lead since MARIA and TIA should not both be generating a modulated colorburst signal at the same time when playing 7800 games. 

 

After further thought, I think the OP should give it a try - even if doesn't improve the picture, it won't damage anything. 

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15 minutes ago, DrVenkman said:

After further thought, I think the OP should give it a try - even if doesn't improve the picture, it won't damage anything. 

He did...he replied with a screen shot just above my reply asking to do that. They can't share the same line because the TIA introduces interference on the Maria colorburst. That is the whole reason for the TIA color kill switch required on the older LHE mods because it wasn't isolating that fully.

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So I decided to just run the lines directly to the TIA and now everything looks perfect.  I haven’t tested the S-Video output yet, but this seems to work out a lot better than the picture version C approach.  

9F1C42A9-647D-4E5A-B515-3A64592A0409.jpeg

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