KIP 9000 Service Manual page 519

7. 3. 2. 6 Foggy thick black lines (from LE to TE)
Cause Order
Image Corona
Developer Unit
7. 3. 2. 7 Clear thin black line (from LE to TE)
Cause Order
Image Corona
Existence of foreign
substance
Drum
NOTE
Wipe the Drum by correct way shown in below. Incorrect way will damage the Drum.
Correct
Checking matter
1 Is the Image Corona dirty?
2 Is the Cleaning Pad correctly
placed at either home position?
3 Can wire cleaning operation be
completed within about 90
seconds?
4 Is the Developer Roller covered
with the toner evenly?
Checking matter
1 Is any foreign substance like
filament jointing the Grid Plate to
Drum?
2 Is the Image Corona dirty?
3 Is any foreign substance like
filament jointing Drum to Corona
or LED Head?
4 Is there any black line or scratch
on the Drum of which location is
just the same as the location of
black line on the print?
Correct
7-32
Result Treatment
Yes Clean each Corona Wire, Housing
and Grid Plate. Replace the Corona
Wire and Grid Plate if too dirty.
No 1. Check the Wire Cleaning Motor.
2. Check if the driving mechanism
of wire cleaner has any
abnormality.
No 1. Check the Wire Cleaning Motor.
2. Check if the driving mechanism
of wire cleaner has any
abnormality.
3. Replace the DC Driver PCB
(PW7755).
No Disassemble the Developer Unit and
find the cause.
Result Treatment
Yes Remove it.
Yes Clean each Corona Wire, Housing
and Grid Plate. Replace the Corona
Wire and Grid Plate if too dirty.
Yes Remove it.
Yes 1. In case of the black line on Drum,
remove it with a dry cloth or
attached "Drum Cleaning Blade".
2. In case of the scratch, find the
cause of scratch first then
replace the Drum. (Suspected
parts for scratch on Drum are
Stripper Finger, Corona, Transfer
Guide, and so on.)
Incorrect
K115sm7e1.doc