Help identifying 1200XL mods

[vattari]

I've recently tried, for the first time, my 1200XL which I had in storage for the past 18 months. I plugged it in and the composite video is so-so and the chroma appears to be missing on an S-Video connection..

I set out to do the ClearPic 2002 modification but it appears some work has been done already (note the skewer in the photo below pointing to the R63 position with a wire in place - the +5V SIO mod?).

In locating the parts needing replacing, I'm unable to guage what work has been done previously.

Can anyone make it out? Thanks

[Paul Westphal]

You can also put a wire in place on U27, and do the same for the green one right next to it. The video will vastly improve. Very bright colors.

[Paul Westphal]

Also, best electronics has new mylars for the keyboard.

[Kyle22]

The wire in place of R63 is to provide +5v to the SIO port. It should be done to all 1200XLs. It has nothing to do with the video.

 

Edit: I see this is a duplicate thread. This has already been answered here: http://atariage.com/forums/topic/268933-help-please-identifying-1200xl-mods/

Edited August 15, 2017 by Kyle22

[+bob1200xl]

Looking at the board... is that a 4MB memory upgrade?? Wow!

 

 

Uhhh. No. Guess not.

 

Seriously, I don't see any mods at all, other than R63.

 

Before you tear into this, try just replacing C115 and L15 with wire (or a really low resistance, like 1 ohm). Use Composite for Chroma on s-video. This should look really nice with a lot less work.

 

You can also run a wire from the left side of R186 (looking from the component side of the m/b) to the empty pin on J5 for Chroma.

 

Bob