KIP 7170K, Service Manual

Page: 522 / 865

K134sm7e2 7-20
7. 2. 2 Countermeasures - Image Quality
7. 2. 2. 1 Halftone is too light
Check the following matters with the Pattern Print, pattern: #01_00 and pattern: #03_00.
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 Wire,
Grid Plate and housing, or
replace the Corona Wire if it
is too dirty.
Is the input voltage to the Image
Corona correct?
No Readjust the input voltage
making reference to [4. 3. 2
Check & Adjustment of
Analog Voltage to the Image
Corona].
Or 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.
Separation Lamp 6 Does the Separation Lamp light
properly?
No 1. Check the wire
connected to the
Separation Lamp.
2. Check or replace the
Separation Lamp.
Transfer Corona 7 Is the Transfer / Separation Corona
dirty?
Yes Clean each Corona Wire
and housing, or replace the
Corona Wire if it is too dirty.
Is the input voltage to the Transfer
Corona correct?
No Readjust the input voltage
making reference to
[4. 3. 3 Check &
Adjustment of Analog
Voltage to the Transfer
Corona].
Or replace the HV Power
Supply PCB.
Contact points of
Developer Bias
8 Is each Electrode Plate on the right 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
9 Can you fix the problem if you replace
the HV Power Supply PCB?
Yes OK