Canon iR105 Service Manual page 673

SERVICE MODE
COPIER>TEST>PG
3 17-Gradation (without image correction; PG-TYPE3)
4 Blank (PG-TYPE4)
5 Halftone (PG-TYPE5)
Halftone Subjected to Density Correction Block (image processing)
In addition to the performance of the image formation system, such density correction
mechanisms as AE affect the result.
S-112
F00-206-04
F00-206-05
F00-206-06
COPYRIGHT© 2001 CANON INC.
Gradation
fault in laser system
Uneven density
primary charging assembly
fault in developing system
Check for Fogging
fault in photosensitive drum
fault in developing system
fault in laser system
[1] Black Line
scratch on drum
dirt on primary charging wire
[2] Vertical White Spot
transfer fault
[3] Left/Right Uneven Density
fault in primary charging assembly
fault in developing system
2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001