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Service Manual
Troubleshooting
7-10
7.3.1 Vertical Black Line and Band
• Description
1. Straight thin black vertical line occurs in the printing.
2. Dark black vertical band occur in the printing.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Check and Cause Solution
1. Damaged develop roller in the Developer.
Deformed Doctor-blade.
2. Scratched surface of the charge 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.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Check and Cause Solution
1. Foreign matter stuck onto the window of
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
been 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. No 3. : Remove the foreign matter and
burr of the exposure window.
(Developer cartridge)
4. No. 4. : Open the front cover and check
ribs that corresponds to the position of
the voids. Remove if found.
5. If the problems are not solved, replace
the developer cartridge.
7.3 Printing Quality Problems