The Cause And Solution Of Bad Image; Vertical Black Line And Band; Vertical White Line - Samsung ML-1430 Service Manual

4.2 The cause and solution of Bad image

4.2.1 Vertical Black Line and Band

1. Straight thin black vertical line occurs in the printing.
• Description
2. Dark black vertical band occur in the printing.
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4.2.2 Vertical White Line

• Description White vertical voids in the image.
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Digital Printer
Digital Printer
Digital Printer
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Samsung Electronics
Check and Cause
1. Damaged develop roller in the Developer
or deformed Doctor-blade.
2. Scratched surface of the discharge roller
in the developer, or heavily accumulated
foreign matters between the discharge
roller and fur transfer roller/ charge roller.
3. Partly depression or deformation on the
surface of the transfer roller.
Check and Cause
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 occur in front of
the image.)
3. It may occur when Burr and foreign sub-
stances are on the window of the devel-
oper frame.
4. If the fuser is defective, voids occur peri-
odically at the top of a black image.
Solution
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.
Solution
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.
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, check to
see if the weight of the developer is
below 670g. If so, replace the developer
cartridge.
Troubleshooting
4-5