Canon Color imageCLASS MF744Cdw
Test Print. How to use 2
For checking ghost due to transfer failure (TYPE=13)
Check item | Checking method | Assumed cause |
---|---|---|
Ghost | Check the degree of ghosting (area where the density is too high or low) in halftone areas. | Cartridge error ITB Unit error |
For checking the density patch (TYPE=14)
Check item | Checking method | Assumed cause |
---|---|---|
Density | Check the density of each patch after calibration. | Cartridge error ITB Unit error Secondary Transfer Roller error Soiling on the Color Displacement/Density Sensor Reader error |
Uneven density | Check the difference in density among patches. | Cartridge error ITB Unit error |
For checking transfer (TYPE=15)
Check item | Checking method | Assumed cause |
---|---|---|
Uneven density | Check that there is no uneven density in the solid area of each color. | Laser Scanner Unit error Cartridge error Primary Transfer Pad error |
Black line (colored line) | Check that there is no black line (colored line) in the solid area of each color. | Scratches on the Photosensitive Drum Soiling on the Primary Charging Roller |
White line | Check that there is no white line in the solid area of each color. | ITB Unit error Secondary Transfer Roller error Soiling on the laser light path |
For checking developing performance (white spots) (TYPE=21)
Check item | Checking method | Assumed cause |
---|---|---|
Gradation | Check the gradation performance. | Cartridge error Soiling on the Color Displacement/Density Sensor ITB Unit error Reader error |
White spots | White spots near the solid patches in halftone patches just before and after the solid patches | Cartridge error |
For checking resolution (TYPE=22)
Check item | Checking method | Assumed cause |
---|---|---|
Line | Check the position and interval. | Laser Scanner Unit error Main Controller PCB error |
For checking banding image (TYPE=23)
Check item | Checking method | Assumed cause |
---|---|---|
Line | Check the position and interval. | Cartridge error Main Drive Unit error ITB Unit error Fixing Assembly error Error in the feed path Paper slip at paper pickup |
4 colors (landscape) (TYPE=24)
Check item | Checking method | Assumed cause |
---|---|---|
Line | Check the position of the line, and check whether the line occurs in all colors. | If it occurs during copying but not with this PG: • Reader error If it occurs only in a single color: • Cartridge error • Laser Scanner Unit error • ITB Unit error If it occurs in all colors: • ITB Unit error • Secondary Transfer Roller error • Fixing Assembly error |
4 colors (portrait) (TYPE=25)
Check item | Checking method | Assumed cause |
---|---|---|
Line | Check the position of the line, and check whether the line occurs in all colors. | If it occurs during copying but not with this PG: • Reader error If it occurs only in a single color: • Cartridge error • Laser Scanner Unit error • ITB Unit error If it occurs in all colors: • ITB Unit error • Secondary Transfer Roller error • Fixing Assembly error |