K117sm7e2
7-21
7. 2. 2. 4 Density is uneven
Check the following matters with the Test Pattern No.1 S(0) and No.3 S(0).
If necessary use other Test Patterns.
Cause Checking
order
Checking Result Treatment
Process Unit 1 Is the Process Unit seated by the 4
thumb screws properly?
No Reseat the Process Unit and
fix it with the thumb screws
properly.
Reinstall the drive belt.
Image Corona 2 Is the Image Corona dirty? Yes Clean the Image Corona, or
replace the Corona Unit.
Is the height of Corona Wire different
between left and right?
Yes Adjust the height properly.
Installation of
Developer Unit
3 Is the Developer Unit firmly pressed
toward the Drum? (Do Counter Rollers
at both sides of the Developer Roller
touch the Drum Unit?)
No Remove the Developer Unit,
and then install it to the
machine correctly.
LED Head 4 Is the Lens Array dirty Yes Clean it.
Eraser Lamp 5 Are all LED of the Eraser Lamp light
properly during the print?
No 1. Replace the Eraser
Lamp.
2. Replace the PW11720
PCB.
Developer Unit 6 Is the Developer Roller evenly covered
with the toner?
No 1. Clean Regulation Roller.
2. Reinstall Scraper.
Is the toner accumulating evenly in the
Developer Unit?
No Level the machine correctly.
7. 2. 2. 5 Totally appeared foggy image
Check the following matters with the Test Pattern No.1 S(0) and No.4 S(0).
If necessary use other Test Patterns.
Cause Checking
order
Checking Result Treatment
Process Unit 1 Is the Process Unit seated by the 4
thumb screws properly?
No Reseat the Process Unit and
fix it with the thumb screws
properly.
Reinstall the drive belt.
2 Try to readjust each image creation
component according to [7.2.1 Basic
Image Adjustment].
Is the problem fixed?
Yes OK
Developer Unit 3 Is the Developer Roller insulated from
the ground?
No Check the Developer Roller
and connector.
Image Corona 4 Is the foggy image printed even if you
print a completely white pattern?
Yes Check the output voltage
from the HV Power Supply
to the Image Corona.
If it is not correct, readjust it.
Developer Bias 5 Is the Developer Unit supplied with a
correct Developer Bias during the print?
No Check the output voltage
from the HV Power Supply
to the Developer Unit.
If it is not correct, readjust it.
Or replace the HV Power
Supply PCB
Photoconductive
Drum
6 Have you used the Photoconductive
Drum longer than its part life?
Yes Replace the Process Unit
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