K117sm7e2
7-18
7. 2. 2 Countermeasures - Image Quality
7. 2. 2. 1 Halftone is too light
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
1 Try to readjust each image creation
component according to [7.2.1 Basic
Image Adjustment].
Is the problem fixed?
Yes OK
LED Head 2 Is the Lens Array of LED Head dirty? Yes Clean it.
Paper 3 Can you fix the problem if you use a
newly unpacked paper?
Yes 1. If the paper was
humidified, instruct the
customer of the way store
the paper.
2. If the paper was not the
specified one, explain the
customer that some
image problem may
occur in that case.
Image Corona 4 Is the Image Corona dirty? Yes Clean each Corona Unit,
Grid Plate and housing, or
replace the Corona Unit if it
is too dirty.
Is the input voltage to the Image
Corona correct?
No Readjust the input voltage.
Replace the HV Power
Supply PCB.
Eraser Lamp 5 Does the Eraser Lamp light properly? No 1. Check the wire
connected to the Eraser
Lamp.
2. Check or replace the
Eraser Lamp.
Transfer Corona 6 Is the Transfer / Separation Corona
dirty?
Yes Clean each Corona Unit, or
replace the Corona Unit if it
is too dirty.
Is the input voltage to the Transfer
Corona correct?
No Readjust the input voltage.
Replace the HV Power
Supply PCB.
Contact points of
Developer Bias
7 Is each Electrode Plate on the left of the
Developer Unit surely contacted to the
Electrode Plate on the machine side?
No Try to install the Developer
Unit so that they are
contacted each other.
And supply the conductive
grease to the Electrode
Plates.
HV Power Supply
PCB
8 Can you fix the problem if you replace
the HV Power Supply PCB?
Yes OK
Installation of
Developer Unit
9 Is the driving gear on the right of the
Developer Unit surely fitted to the
driving mechanism on machine side?
No Reseat Developer Unit in
position.
Check the concerning gears.
Developer Unit 10 Is the Developer Roller evenly covered
with the toner?
No Check the whole Developer
Unit to find the cause.
Yes Replace the Process Unit
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