11.Image Quality Problem: Full Page
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5. Select [Normal] in [Black text and graphics] to print the black text and graphics as a four-colors
black using C, M, Y, and K toner.
If you select [Pure Black On] in [Black text and graphics], the machine prints black text and
graphics as a one-color black, using black toner only.
After taking the above measures, do the color calibration adjustment of the DFE.
Uneven Density between Left and Right of an Image: 40 mm Interval
Uneven density between the left and right side of an image occurs at 40 mm interval due to the different
charge between the front and rear side of the drum.
This is likely to occur if:
Printing a first print in the early winter morning
Solution
1. Set the setting of SP2-109-003 (Test Pattern) to “12 (Independent Pattern 2 dot)”.
2. Print the test pattern.
3. Is there uneven density between the left and right of the image?
YES: Go to next step.
NO: Finish
4. Does the problem occur periodically at 40 mm interval?
YES: Go to next step.
NO: Refer to other troubleshooting.
5. Execute “Process Control (SP3-011-001)”.
Normally, Process Control is executed at a first print just after turning on the machine.
However, the adjustment of the AC charge bias may not be completed at once if the machine
is located in the low temperature and low humidity condition. Therefore, execute the process
control again manually.
6. Print the target image. Is the printed image acceptable?
YES: Finish
NO: Go to next step.
7. Increase the room temperature (guideline: 20°C or higher) and wait for 30 minutes at least.
Increasing the room temperature can restrain the increase of the charge roller resistance, and
then solve the insufficient charge for the drum.
8. Print the target image. Is the printed image acceptable?
YES: Finish
NO: Go to next step.
9. Turn on the anti-condensation heater.
Turning on the anti-condensation heater can maintain adequate temperature inside the
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