Managing Consumables
Advanced Topics 6-9
Advanced Topics
Figure 6-2 Toner Recycling Slide Switch
Drum and Developer
The drum and developer are grouped together because their yields depend on drum rotations.
There is physical wear on the drum and developer mixture with every rotation of the drum.
The drum is often rotating even when the printer is not printing. Factory yield estimates for the
drum and developer, listed on the data sheet and in this manual, can never be accurate because
there is not a one-to-one correspondence between drum rotations and printed pages. However,
the internal counters in the printer do count drum rotations for both the drum and developer.
The drum life is estimated at 250,000 drum rotations and the developer life is estimated at
160,000 drum rotations.
The drum rotates during power up, at the start and end of each job, and while printing each
image. Knowing what factors drive drum rotations helps you understand what determines the
lives of your drum and developer.
Frequent power cycling or lapses into power save mode add wear to the drum and developer.
During power-up or coming out of power save mode, the drum rotates for up to two minutes.
This can produce as many as 80 drum rotations even though no pages are printed.
Toner Recycle Slide
