The equations for the xerographic discharge of the potential are solved analytically by means of a flow line technique. The solution is for single‐carrier discharge corresponding to charge generation using strongly absorbed light. Exact analytical solutions are given for two cases in which both the photoinjection efficiency and the mobility are field dependent, including the Poole‐Frenkel effect. The surface potentialV(t) andd V(t)/d tare calculated for specific cases, and the effect of variations in mobility, thickness, and injection rate are discussed. Under certain conditions the discharge can remain emission limited for all times. It is shown that a discontinuity in the conduction current exists at the transit time of the lead carriers, corresponding to the cusp in the constant‐potential case when the current is space‐charge limited.