Samsung ML-2150 Service Manual page 107

T RO U B L E S H O OT I N G
Fault
White Black spot • Light or dark black
Digital Printer
Digital Printer
• White spots occur
Digital Printer
Digital Printer
Digital Printer
Recycled product • Poor appearance of
• Unclean and rough
• Bad background in
Service Manual
7-22
Signs
1. If light or dark periodical black
dots occur, this is because the
dots on the image
toner cartridge rollers are cont-
occur periodically.
aminated with foreign sub-
stance or paper particles.
(1)38mm interval : Charged
in the image period-
ically.
(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 toner
the toner cartridge. cartridge.
(1)Check the damage to label
and whether different materi-
printouts. als are used.
(2)Check the appearance of
parts of the toner cartridge,
the image. 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 toner cartridge.
(2)Check whether the state of
the terminal assembly is nor-
mal.
Cause & Check
roller
Solution
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 38.5mm - Replace
the toner cartridge.
: at intervals of 96mm - Remove
foreign substance.
: Broken image - Replace the
toner 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 toner cartridge.
(2)If materials other than normal
parts of the toner 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 toner car-
tridge is recycled over 2 times.
(2)If toner nearly being expired
are collected to use, it is
judged as the recycled toner
cartridge.
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