Uneven Density Caused By Irregular Rotation Of The Main Motor - Canon iR3570 Service Manual

Chapter 14
<Cause>
When a paper jam occurs, the machine forces the main motor to stop, thus stopping the operation without removing charges from the surface of the photosensitive
drum. 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 the
photosensitive drum, ultimately resulting in uneven density in sub scanning direction.
<Field Remedy>
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 as
to how it may be left alone.
<Image Sample>

14.2.1.3.5 Uneven Density Caused by Irregular Rotation of the Main Motor

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
<Symptom>
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 motor
starts to rotate irregularly.
- iR2270/2870
intervals of about 3.5 mm
- iR3570/4570
intervals of about 6.3 mm
To facilitate a check, use a halftone test pattern.
<Remedy>
Replace the main motor.
14-6
F-14-4
0007-9967