CHAPTER 7 SOFTWARE SERVICE SUPPORT
7-6
<How to calculate drum unit life>
**Printing time for 1 page/job in discontinuous printing = 12 seconds
(Page counter reduced by the number of drum rotations) = (Time of motor rotation) ÷ (12 sec.)
Example:
Cold start (Idling for 5 sec.) Hot start Page
counter
1 page/job (5 + 8.4) / 8.4 = 1.60 8.4 / 8.4 = 1 1
2 pages/job (5 + 8.4 + 3.6) / 8.4 = 2.02 (8.4 + 3.6) / 8.4 = 1.43 2
16 pages/job (5 + 8.4 + 3.6 x 15) / 8.4 = 8.02 (8.4 + 3.6 x 15) / 8.4 = 7.43 16
If printing 1 page per job with cold start, the drum unit life is decreased earlier.
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