An electrostatographic process cartridge (100) is detachably mountable into a cavity defined by mated machine modules forming parts of an electrostatographic reproduction machine. The process cartridge (100) includes a housing having walls (102, 104, 106) defining a process chamber(118) and a rotatable cylindrical photoreceptor (84) mounted to the walls (102, 104) and horizontally within the process chamber (118). The cylindrical photoreceptor (84) has a fixed rotational closed loop path within the process chamber (118). The process cartridge (100) also includes plural process components including a toner image transferring component (68), a cleaning component (80), a charge erase light component (126), a charging component (76), an imagewise exposure component (122), and a development component (92), each acting along the closed loop path for consistently producing high quality toner images. The plural components each have a critical acting position spaced circumferentially along the closed loop path, and the critical acting positions include a 234° position for the toner image transferring component (68) so as to have reliable, precise sheet feeding to an image transfer point, and a short near vertical sheet path; a 0° position for the cleaning component (80) so as to prevent any leaking toner particles from falling backwardly and down, thus contaminating image carrying sheets moving from the transfer point to a fusing module; a 96° position for a ROS beam imagewise exposure component (122) so as to form a latent image effectively with the ROS beam without undesirable curvature effects from a cylindrical profile of the photoreceptor; and a 163° position for the development component (76) in order to minimize dark decay in the formed latent image prior to its development.