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My first thought is that the numbers being "hammered" against the paper are not reaching far enough. Test this theory by putting two layers of paper into the paper feed, (Fold the end of the roll over onto itself) and try printing again. It could be designed for a thicker paper.
Alternatively the new ribbon may also have dried out. Rub the ink ribbon with a paper, or pencil eraser and see if the ink readily comes off, perhaps use a pencil eraser to press it against the paper being fed through the machine.
These are diagnostics to find the error. Further investigation might be to see if there is any particles in the machine preventing it from hammering the numbers against the paper. Something might be in the way of the moving parts, something about the size of a paper hole punch paper, or pencil shaving. Shaking it vigorously upside down might solve this problem.
The Casio DR-T220 does not use regular adding machine tape, it requires a thermal tape since it is a thermal printer. There is no ink or ink ribbon in this caculator, it is heat activated and it is the special paper that make the numbers appear. Thermal tape is available at all office supply stores.
If the machine has mainly printed 6x4,When you
go to print 7x5 the edges of the head and rollers
tend to be dirty and will leave the two stripes along
the edge of the prints.Use the cleaning ribbon and the
sticky pad supplied with a new box of paper to clean the machine.Depending on how bad it is it may take a few try's.To do this switch the machine on and enter the control panel by tapping twice on the top left of the monitor- It will ask for a four digit code - Uless it has been changed this will be 9999 click
Enter/Ok - then click on the top far right ikon and
the screen you see will have a greyed out ikon
bottom middle - Now replace the print ribbon with
the white cleaning ribbon supplied with the machine
and the greyed out button becomes active - Click on
this button and the machine asks if you want to clean
it click Enter/Ok - About 10" of paper will then be
driven from the machine place the sticky pad as per
the drawing on it onto the paper and press Enter/Ok
- The paper will move in and out a few time and then eject a big piece and some small pieces of paper - Then remove the white cleaner ribbon and replace with the print ribbon and press the green return button
in the bottom right of the screen to return to normal use.This should be performed every two - three boxes