Xerox Phaser 3450, Service Manual, Page: 76 / 155

7
7
7-1
TROUBLESHOOTING
Service Manual
7. Troubleshooting
7.1 The cause and solution of Bad image
7.1.1 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.
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Check and Cause Solution
1. Damaged develop roller in the Toner car-
tridge. Deformed Doctor-blade or clean-
ing-blade.
2. Scratched surface of the discharge roller
in the toner cartridge.
3. Partly depression or deformation on the
surface of the transfer roller.
1. If causes 1 and 2 occur in the toner car-
tridge, replace the toner cartridge and try
to print out.
2. Replace the transfer roller if occurred as
No. 3.
7.1.2 Vertical White Line
• Description White vertical voids in the image.
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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 toner cartridge roller and blade.
(In case the life of the toner cartridge has
been expired, white lines or light image
occur in front of the image.)
3. It may occur when Burr and foreign sub-
stances are on the window of the toner
cartridge frame.
4. If the fuser is defective, voids occur peri-
odically at the top of a black image.
5. It may occur when foreign substances
are on the OPC Drum.
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. Replace the toner cartridge.
3. No 3. : Remove the foreign matter and
burr of the exposure window.
(toner 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 toner cartridge.