Drum life under different circumstances The following graph shows the approximate life of the imaging drum for different types and sizes of print jobs. 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Pages/Drum (K) 1 2 5 10 15 20 2000 Pages/job A-4 simplex monochrome A-4 duplex monochrome A-4 simplex color A4 duplex color Figure 4-1 Imaging drum life Note When printing black pages, there is a wider range of variation in pages/drum. The drum life will be well below 25,000 images if only short monochrome jobs are printed. C7085-90921 Chapter 4 Printer maintenance 81