KIP 9000 Service Manual page 514

7. 3. 2. 2 Halftone and solid black are too light
Cause
Transfer Printing media
Defect
Transfer/
Separation
Corona
High Voltage
Lead Line
HVP3
Main Control PCB
(PW11520)
Development Contact of Bias
defect Pins and Bias
Plate
Developer Unit
Position of
Developer Unit
against Drum
Toner Sensor
Order Checking matter
1 Turn off the KIP9000 in the
middle of printing, draw out the
Process Unit, and check the
toner image on the Drum.
Is a normal image created
between Developer Unit and
Transfer Corona?
2 Can the issue be fixed if a
newly unpacked media is
used?
3 Can the issue be fixed if a
supported (specified) media is
used?
4 Is the Transfer/Separation
Corona properly installed?
5 Does a leak of high voltage
occur on the Transfer Corona?
6 Is the resistance of High
Voltage Lead Line between
HVP3 and Transfer Corona
about 10 ohms?
7 Does the current show -1.4 +/-
0.02mA. which is supplied
from HVP3 to Transfer
Corona?
8 Perhaps is the output from
HVP3 not adjustable in spite of
every possible trial?
9 Are the Bias Pins on the Side
Plate surely contacted to the
Bias Plate of the Developer
Unit? And are Bias Pins and
Bias Plate provided with
enough conductive grease?
10 Is the Developer Roller
covered with the toner evenly?
11 Are the Counter Rollers on
both sides of Developer Unit
correctly contacted to the ends
of Drum?
12 Is the Cam of pressurizing
mechanism placed at the
correct position for pressing
the Developer Unit to the
Drum?
13 Is there enough toner in the
Developer Unit?
7-27
Result Treatment
Yes Transfer defect seems to be
the cause of this issue. Go
to the following 2.
No Development defect seems
to be the cause of this
issue. Go to the following 9.
Yes Advise the user to keep the
media avoiding the
humidity.
Yes Explain to the user that a
satisfactory image quality
may not be achieved if
unsupported media is used.
No Install it properly.
Yes Clean the whole Transfer
Corona. Replace the
Corona Wire if too dirty.
No Replace the High Voltage
Lead Line.
No Adjust the current seeing
[4.3.3 Checking &
Adjustment of HVP3 (For
Transfer Corona)] on page
4-70.
No Replace the Main Control
PCB.
No 1. Reinstall the Bias Pins to
contact them to the Bias
Plate.
2. Lubricate the Bias Pins
and the Bias Plate with
conductive grease.
No Disassemble the Developer
Unit and find the cause.
No Reinstall the Developer Unit
correctly.
No Check if the Developer
Positioning Motor or the
pressurizing mechanism
has any abnormality.
No 1. Check if the harness of
Toner Sensor has any
abnormality.
2. Replace the Toner
Sensor if the harness is
OK.
K115sm7e1.doc