exxos's Atari, Amiga & retro forum

Steve wrote: 28 Mar 2025 15:24 Hi all,

I'd like to adjust the vertical size of the picture for this PTC-1426, as you can see, there are significant black bars top and bottom. I can't find a service manual anywhere though! I have found one for the PTC-1424 which is similar, but not exactly the same, as it has some picture adjustments conveniently located on the rear, where as the 1426 does not.

I looked here: https://docs.dev-docs.org/htm/search.php?find=_M

I suppose I could just start playing around with some of the pots inside the monitor, but I'd rather not be guessing, otherwise I might tweak something I shouldn't! :)

Edit: I am struggling to upload the image, every time it seems corrupted? Don't know why. I've saved it as jpg twice, then as png... I've uploaded it 4x times now, no dice..

PTC1426_7.png