Canon iR C3380 series, Service Manual

Page: 218 / 610

Chapter 7
7-8
7.1.8 ITB Cleaning Block
0013-8470
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
In this block, the ITB is cleaned to prevent image faults that otherwise could occur because of soiling on the ITB.
step 8: ITB cleaning
In this step, the residual toner on the ITB is scraped by the cleaning blade of the ITB cleaning unit. The toner that has been scraped off by the blade is collected in
the waste toner case found at the front left of the machine.
F-7-12
7.1.9 Photosensitive Drum Cleaning Block
0013-8471
/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
In this block, the photosensitive drum is both physically and electrostatically cleaned (by removing residual charges) to prevent image faults otherwise caused by
soiling on the photosensitive drum or uneven charges remaining on the surface of the drum.
step 9: photosensitive drum cleaning
In this step, the toner remaining on the surface of the photosensitive drum is scraped off by the cleaning blade. The toner that has been scraped from the drum is
collected in the waste toner case found at the left front of the machine.
F-7-13
step 10: post-exposure
In this step, the laser light from the laser/scanner unit is directed to the surface of the photosensitive drum to free the surface from residual charges in preparation
for the next print job, thus preventing uneven density.
This mechanism is executed for every post rotation at the end of a job.
ITB
IITB cleaning blade
Tension roller
Residual toner
Photosensitive drum
Drum cleaning blade
ITB
Primary transfer roller
Residual toner