Samsung ML-3561N Series, Service Manual

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Service Manual
Troubleshooting
7-22
Samsung Electronics
Fault Signs Cause & Check Solution
White Black spot
Recycled product
• Light or dark black
dots on the image
occur periodically.
• White spots occur
in the image period-
ically.
• Poor appearance of
the print cartridge.
• Unclean and rough
printouts.
• Bad background in
the image.
1. If light or dark periodical black
dots occur, this is because the
print cartridge rollers are conta-
minated with foreign substance
or paper particles.
(1)38mm interval : Charged
roller
(2)95mm interval : OPC cycle
2. If white spots occur in a black
image at intervals of 95mm, or
black spots occur elsewhere,
the OPC drum is damaged or
foreign substance is stuck to
the surface.
3. If a black and white or graphic
image is partially broken at
irregular intervals, the transfer
roller's life has been expired or
the transfer voltage is abnor-
mal.
1. Poor appearance of the print
cartridge.
(1)Check the damage to label
and whether different materi-
als are used.
(2)Check the appearance of
parts of the print cartridge,
such as frame, hopper.
2. Unclean and rough printouts.
(1)Check whether foreign sub-
stance or toner are stuck to
the terminal (contact point) of
the print cartridge.
(2)Check whether the state of
the terminal assembly is nor-
mal.
1. In case of 1 above -
Run OPC Cleaning Mode Print
4-5 times repeatedly to remove.
Especially check foreign sub-
stance on the OPC surface, then
remove them with a clean gauze
moistened with IPA(Isopropyl
Alcohol) not to damage OPC if
necessary.
Never use usual alcohol.
2. In case of 2
If they are not disappeared by
running OPC Cleaning Mode
Print 4-5 times.
: at intervals of 38mm - Replace
the print cartridge.
: at intervals of 95mm - Remove
foreign substance.
: Broken image - Replace the
print cartridge according to
carelessness.
3. In case of 3 - Exchange the
transfer roller because the life of
the transfer roller in use has been
expired. (Check the transfer volt-
age and readjust if different.)
1. In case of 1 -
(1)If there is an evidence of disas-
sembling the print cartridge.
(2)If materials other than normal
parts of the print cartridge are
added or substituted.
2. In case of 2 - If there are any
abnormals in connection with the
situation of 1.
(1)It occurs when the print car-
tridge is recycled over 2 times.
(2)If toner nearly being expired
are collected to use, it is
judged as the recycled print
cartridge.
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