KIP 9000 Service Manual page 518

7. 3. 2. 4 Uneven density between left and right
Cause Order
Image Corona
Developer Unit
Dirt of LED Head
Eraser Lamp
Main Control PCB
(PW11520)
LED Head
7. 3. 2. 5 Foggy background
Cause Order
Developer Unit
Image Corona
Developer Bias
Main Control PCB
(PW11520)
LED Head
Checking matter
1 Is the Image Corona dirty?
2 Is the Corona Wire fitted into the
V shape groove of Corona
Heads? Or is the Cleaning Pads
properly holding the Corona Wire?
3 Are the Counter Rollers on both
sides of Developer Unit correctly
contacted to the ends of Drum?
4 Is the Developer Roller covered
with the toner evenly?
5 Is the thickness of toner in the unit
different between left and right?
6 Is the LED Head dirty?
7 Do all LED of the Eraser Lamp
light?
8 Can the issue be fixed by
replacing the Main Control PCB?
9 Can the issue be fixed by
replacing the LED Head?
Checking matter
1 Is there any foreign substance on
anywhere as Developer Roller
shaft, Bias Pins or Bias Plate,
which helps the Bias escaping to
the ground?
2 Is there more (or less) toner than
required around the Agitator in the
Developer Unit?
3 Print out the Test Pattern 4 (White
print). Does this print also have
the foggy background?
4 Are the following voltages
supplied to the rollers in
Developer?
Developer Roller : -250 +/-3V
Toner Sup. Roller : -350 +/-3V
Reg. Roller Center : -100 +/-3V
Reg. Roller sides : +365 +/-3V
NOTE : Set the Auto Density
Control for measuring the Bias
value.
5 Perhaps is the output from Bias
Power Supply not adjustable in
spite of every possible trial?
6 Can the issue be fixed by
replacing the LED Head?
7-31
Result Treatment
Yes Clean each Corona Wire, Housing
and Grid Plate. Replace the Corona
Wire and Grid Plate if too dirty.
No Correct the height of Corona Wire as
it is not correct.
No Reinstall the Developer Unit
correctly.
No Disassemble the Developer Unit and
find the cause.
No Check if the KIP9000 is placed
horizontally.
Yes 1. Take cleaning for the LED Head
pressing [EXP CLEAN] Key.
2. Check if the Pad Ass'y 2 of LED
Head is dirty or its life is ended.
No Replace the Eraser Lamp.
Yes OK
Yes OK
Result Treatment
Yes Remove it.
Yes Check the Toner Sensor.
Yes 1. Adjust the output voltage from
HVP6 to Grid Plate seeing [4.3.6
Checking & Adjustment of HVP6
(For Grid Plate of Image Corona)]
on page 4-79.
2. Adjust the output current from
HVP1 to Image Corona seeing
[4.3.2 Checking & Adjustment of
HVP1 (For Image Corona)] on
page 4-68.
No Adjust each output properly seeing
the following pages.
Developer Roller
Toner Supply Roller
Reg. Roller Center
Reg. Roller Both sides : Page 4-93
No Replace the Main Control PCB.
Yes OK
K115sm7e1.doc
: Page 4-84
: Page 4-87
: Page 4-90