Canon i-SENSYS MF446x

Grid Pattern (TYPE = 0)

Check item	Checking method	Assumed cause
Right Angle/ Straight Lines	Check that lines in horizontal/vertical scanning directions are paralleled to the paper. Check that these lines are at right angle to one another.	Failure of feed system Failure of Laser Scanner Unit
Magnification Ration	Check that the grid is printed at 9.99 mm intervals. (Check the image on the second side at duplex printing.)	Failure of roller’s feed system Failure of Photosensitive Drum Failure of Laser Scanner Unit

Halftone Pattern (TYPE = 1)

Check item	Checking method	Assumed cause
Transfer failure	Check the evenness of density.	Failure of transfer system Failure of Transfer Roller
Black line	Check that no black line appears on the image.	Failure of developing system Failure of cleaning (drum) Failure of Transfer Roller
White line	Check that no white line appears on the image.	Soiling on the laser light path Failure of developing system
Uneven Pitch	Check that no line appears in the horizontal scanning direction of the image.	Failure of Photosensitive Drum Failure of developing system Failure of laser exposure system Drive-related failure
Uneven Density	Check the evenness of density.	Failure of Photosensitive Drum Failure of developing system Failure of Transfer Roller

Black Pattern (TYPE = 2)

Check item	Checking method	Assumed cause
Transfer failure	Check the evenness of density.	Failure of transfer system Failure of Transfer Roller
White line	Check that no white line appears on the image.	Failure of developing system
Uneven Pitch	Check that no line appears in the horizontal scanning direction of the image.	Failure of Photosensitive Drum Failure of developing system Failure of laser exposure system Drive-related failure
Uneven Density	Check the evenness of density.	Failure of Photosensitive Drum Failure of developing system Failure of Transfer Roller

White Pattern (TYPE = 3)

Check item	Checking method	Assumed cause
Black line	Check that no black line appears on the image.	Failure of developing system Failure of cleaning (drum) Failure of Transfer Roller
Fogging	Check that no fogging appears on the image.	Failure of Photosensitive Drum Failure of laser exposure system Failure of developing system

Gradation 17 Pattern (TYPE = 4)

Check item	Checking method	Assumed cause
Gradation	Check that gradation in density is made appropriately.	Failure of Photosensitive Drum Failure of laser exposure system Failure of developing system
Fogging	Check that no fogging appears in the blank area.	Failure of Photosensitive Drum Failure of laser exposure system Failure of developing system
Black line	Check that no black line appears on the image.	Failure of developing system Failure of cleaning (drum) Failure of Transfer Roller
White line	Check that no white line appears on the image.	Soiling on the laser light path Failure of developing system
Uneven Density	Check that there is no density difference between the front and rear sides	Failure of Photosensitive Drum Failure of developing system Failure of Transfer Roller

Thin Horizontal Line Pattern (TYPE = 5)

Check item	Checking method	Assumed cause
Black line	Check that no black line appears on the image.	Failure of developing system Failure of cleaning (drum) Failure of Transfer Roller
White line	Check that no white line appears on the image.	Soiling on the laser light path Failure of developing system