A couple months ago my 28 skintight started printing I instead of T. (See first photo.)
My first thaought was misinterpreting a character. I checked The code chart: T is ----5, while I is -23--. Not likely.
My next though was that the platen might have been to low and the T-bar was trying to print around the curve. That is an easy adjustment on a 15 but I have no jdea how to do on a 28. So I just stopped using it.
Yesterday I started thinking about ribbons. After I re-ink a ribbon too many times it starts to fold over on top. I checked and that was not the case here. Then I wondered if the ribbon oscillator was not lifting the ribbon high enough. I stared at it while it was mis-printing, but nothing jumped out at me. Then I got the bright idea of turning the ribbon upside down. I reversed the spools - Problem solved! (See second photo.)
I hope this might help somebody.
Tom N3CRK