White Carbon Paper mystery - I offer this solution ...

The instructions maybe all relating to the White carbon paper and black sheet that are in the 'Label Set' that is under the instruction sheet.

(Parts manual extract diagram attached)

Presumably this was so users could customize a label on each side of the keyboard - with white characters on a black background.

I haven't as yet found any photographs of keyboards where users have made their own labels, so perhaps this 'feature' was seldom used.

So I would feel that the instructions are only relating to the label set stored behind, and not relating to general printing.

Would a member like to show us this label set? *smiles*.