Hi,
You need a new ribbon.
Older or much older desk top calculators used a small sized ribbon such as the old typewriters used except that the reels were about 1 inch across. Often they were divided into a red and black side.
It the calculator had all of the numbers strike the paper at the same instant, then it would use an
ribbon.
Here is a link to an Amazon.com page that sells the correct ribbon for your calculator.
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=1123+PD+&x=17&y=17
Here is a picture
Hope this helps,
Best Regards,
Mark
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