Canon imageCLASS MF525dw
Troubleshooting. Test Print. Controller
The following test print types are available with this machine, and you can check for failure of an image with a circle 'Yes' described in the image check items in the table below. When no failure is found in the test print in normal output mode, it can be caused in PDL input or Reader. The image of the test print is generated by the Main Controller PCB.
Follow the procedure shown below to output the test print.
- Select the following service mode.
TESTMODE > PRINT > PG-TYPE - Enter the PG number using the numeric keypad, and press the [Apply] key.
NOTE:
If necessary, change the settings for test print in the following service mode.
If the settings are not changed, a test print will be executed with the initial values of service mode settings.
• Setting of the number of output sheets:
TESTMODE > PRINT > COUNT
• Setting of 1-sided/2-sided printing:
TESTMODE > PRINT > PHASE
• Setting of the image formation method:
TESTMODE > PRINT > MODE
• Setting of the image correction table:
TESTMODE > PRINT > THRU
• Adjustment of test print density:
TESTMODE > PRINT > DENS
• Setting of toner thinning process:
TESTMODE > PRINT > MABK
• Setting of the paper source used when outputting a test print:
TESTMODE > PRINT > FEED - Execute the following service mode to output a test print.
TESTMODE > PRINT > START
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 Ratio |
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 |