ABSTRACT
I. INTRODUCTION A basic requirement for a photoreceptor that is to be used in a repetitive process is that the sensitometry must be stable with cycling. Any change must be either small or managed through process control such that there are no noticeable differences throughout the photoreceptor life. A photoreceptor that shows a change in sensitometry with cycling is said to fatigue with use. The most common examples of fatigue are a decrease in charge acceptance and an increase in the rate of dark discharge, sometimes called cycle-down, and an increase in the residual potential that cannot be removed with an erase exposure, usually described as cycle-up. In some cases both may be observed simultaneously. These conditions lead to a decrease in the potential available for development and give rise to either unacceptably low print density or background toning, depending on the develop ment process.
