Brother HL 5030 - B/W Laser Printer Service Manual page 240

CHAPTER 7 SOFTWARE SERVICE SUPPORT
<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:
1 page/job
2 pages/job
16 pages/job
If printing 1 page per job with cold start, the drum unit life is decreased earlier.
Cold start (Idling for 5 sec.)
(5 + 8.4) / 8.4 = 1.60
(5 + 8.4 + 3.6) / 8.4 = 2.02
(5 + 8.4 + 3.6 x 15) / 8.4 = 8.02
Hot start
8.4 / 8.4 = 1
(8.4 + 3.6) / 8.4 = 1.43
(8.4 + 3.6 x 15) / 8.4 = 7.43
7-6
Page
counter
1
2
16