Troubleshooting; Image Faults - Canon imageRUNNER 2270 Service Manual

Chapter 14

14.2 Troubleshooting

14.2.1 Image Faults

14.2.1.1 Uneven Density
14.2.1.1.1 Uneven Density in Sub Scanning Direction
0007-7464
<Description>
This fault can occur when the machine is left alone for about 10 min to 5 hr without
removing a paper jam.
<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.
14-5