Chapter 1414-6When a paper jam occurs, the machine forces the main motor to stop, thus stopping the operation without removing charges from the surface of the photosensitivedrum. If the machine is left alone for a long time with the surface potential of its photosensitive drum uneven, potential memory tends to occur within a layer of thephotosensitive drum, ultimately resulting in uneven density in sub scanning direction.To rid the surface of the photosensitive drum of potential memory, leave the machine alone for 30 min after removing the jam. There is no specific instructions asto how it may be left alone.F-14-414.2.1.3.5 Uneven Density Caused by Irregular Rotation of the Main Motor0007-9967iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /Uneven density at specific intervals tends to occur in sub scanning direction (from leading edge to trailing edge in relation to paper movement) when the main motorstarts to rotate irregularly.- iR2270/2870intervals of about 3.5 mm- iR3570/4570intervals of about 6.3 mmTo facilitate a check, use a halftone test pattern.Replace the main motor.
