A&D 191 - Manual (Page 5)

500,000 lines mean character before failure.
Black- 200,000 characters
Purple-250,000 characters
Large roll - 12,500 lines
Small roll - 3,000 lines
Ribbon life Ribbon life Ribbon life Ribbon life Ribbon life
PPPPPaper aper aper aper aper
PPPPPrint Head Life rint Head Life rint Head Life rint Head Life rint Head Life