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.
Good luck ;)
1-Turn off printer,
If the print is too dark, turn off the printer and move the printhead's adjustment lever slightly away from the ribbon.
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