Canon MF448dw
Troubleshooting. Test Print. How to use
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 |