Samsung SF-830, Service Manual

Page: 73 / 189

Troubleshooting
Samsung Electronics 4-40
White Black spot • Light or dark black
dots on the image
occur periodically.
• White spots occur in
the image periodi-
cally.
1. If light or dark periodical black
dots occur, this is because the
developer rollers are contami-
nated with foreign substance or
paper particles.
(1)37.7mm interval :
Charged roller
(2)94.3mm interval :
OPC cycle
2. If white spots occur in a black
image at intervals of 94, 29mm, 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 irregu-
lar intervals, the transfer roller's
life has been expired or the trans-
fer voltage is abnormal.
1. In case of 1 above -
Run OPC Cleaning Mode Print 4-5 times
repeatedly to remove. Especially check
foreign substance on the OPC surface,
then remove them with a clean gauze
moistened with IPA(Isopropyl Alcohol) not
to damage OPC if necessary.
Caution : 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 94.3mm -
Replace the developer.
: at intervals of 37.7mm -
Remove foreign substance, Clean the
Charged Roller
: Broken image -
Replace the developer 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 voltage and readjust if different.)
Recycled product • Poor appearance of
the developer.
• Unclean and rough
printouts.
• Bad background in
the image.
1. Poor appearance of the devel-
oper.
(1)Check the damage to label and
whether different materials are
used.
(2)Check the appearance of parts
of the developer, 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
developer.
(2)Check whether the state of the
terminal assembly is normal.
1. In case of 1 -
(1)If there is an evidence of disassembling
the developer.
(2)If materials other than normal parts of
the developer 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 developer is recy-
cled over 2 times.
(2)If toner nearly being expired are col-
lected to use, it is judged as the recycled
developer.
Fault Signs Cause & Check Solution
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer