Check and Cause Solution
1. Damaged developer roller in the developer.
Deformed Doctor-blade or cleaning-
blade.
2. Scratched surface of the discharge roller
in the developer.
3. Partial depression or deformation on the
surface of the transfer roller.
1. If causes 1 and 2 occur in the developer
cartridge, replace the developer and try to
print out.
2. Replace the transfer roller if occurred as
No. 3.
7.3.2 Vertical White Line
• Description White vertical voids in the image.
Check and Cause Solution
1. Foreign matter stuck onto the window or
internal lenses of LSU mirror.
2. Foreign matter or toner particles between
the developer roller and blade.
(In case the life of the developer has
expired, white lines or light image
occur in front of the image.)
3. It may occur when a burr and foreign
substances are on the window of the
developer frame.
4. If the fuser is defective, voids occur peri-
odically at the top of a black image.
1. Foreign matter stuck onto the window :
Clean the LSU window with recommend-
ed cleaner(IPA) Clean the window with a
clean cotton swab.
2. Foreign matter in the LSU : Open the
cover of LSU and clean with a cotton
swab on the surface of the reflex mirror.
3. Remove the foreign matter and
burr of the exposure window.
(Developer cartridge)
4. Open the front cover and check
that the ribs corresponds to the position
of the lines.
5. If the problems are not solved, replace
the developer cartridge.
7.3 Printing Quality Problems
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