Possible reasons of a fatigue of organic photoreceptors such, as the photochemical processes in charge transfer layers (CTL) are investigated and discussed. The results concern a study of influence of corona discharge, exposure and joint action of both the factors on cyclic stability of organic photoreceptors. The charge generation layers (CGL) use titanyl phthalocyanine (TiOPc), bisazo dye and effective stabilizers. The organic photoconductor (OPC) in CTL are p-diethylaminobenzaldehyde diphenylhydrazone (DEH), N-phenyl-4-tolyl-β-naphtylamine (PTNA) or N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine (TPD) without stabilizers. It was established, that the values of a residual potential and dark decay of potential greatly depend on the exposure conditions such as light wavelength in cycle “charging-exposition”. It can be conditioned by reactions of bication radicals or photoexited monocation radicals of OPC molecules, for example with impurities involved in CTL.