Sharp MX-4140N Installation Manual page 15

b. Monochrome copy check items (Check to confirm the following:)
1) There are 12 void areas.
2) The resolution of 4.0 (5 points) can be seen.
3) The density difference between the F and the R sides is not so
great.
MX-5141FN MX-4140N/4141N/5140N/5141N (MAIN UNIT) 2 – 11
4) There are no white and black streaks.
5) The background density is not so light.
6) The black low-density gradation is copied slightly.