MX-2640N, MX-2640NR, MX-2640FN, MX-3140N, MX-3140NR, MX-3140FN, MX-3640N, MX-3640NR, MX-3640FN (serv.man10). Installation Manual Revised June 2014. - Sharp Copying Equipment Service Manual (repair manual). Page 22

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MX-3640N  MX-2640N/3140N/3640N (MAIN UNIT)  2 – 12
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.
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.
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