Samsung SF-830, Service Manual

Page: 72 / 189

Troubleshooting
4-39
Samsung Electronics
4-7-3-1 Signs and Measures at Poor toner cartridge
Fault Signs Cause & Check Solution
Light image and
partially blank
image
(The life is ended.) • The printed image is
light or unclean and
untidy.
• Some part of the
image is not
printed.
• Periodically a noise
as "tick tick" occurs.
1. If the image is light or unclean
and untidy printed image - Shake
the developer and then recheck.
(1)NG: Check the weight of the
developer
(2)OK: Lack of toner, so the life is
nearly closed.
2. Some part of image is not printed
- Shake the developer and then
recheck.
(1)NG: Check the weight of the
developer and clean the
LSU window with a cotton
swab, then recheck.
(2)OK: Lack of toner, so the life is
nearly closed.
3. Periodically a noise as "tick tick"
occurs - Measure the cycle and
the weight of the developer.
4. White vertical stripes on the
whole screen or partly :
Check the weight of the developer.
1. All of 1, 2, 3 above-
If it become better by shaking, replace
with a new developer after 50-100
sheets in the closing state of the life
span.
2. In case of 2-
If it becomes better after cleaning the
LSU window, then the developer is nor-
mal.
(Because of foreign substance on the
LSU window, the image has not been
printed partly.)
3. In case of 3-
If the cycle of noise is about 2 seconds,
the toner inside the developer has been
nearly exhausted.( Purchase and replace
with a new developer after using about
200 sheets at the point of occurrence)
4. In case of 3-
This is a phenomenon caused by lack of
toner, so replace with a new developer.
Toner Contamina-
tion
• Toner is fallen on the
papers periodically.
• Contaminated with
toner on prints
partly or over the
whole surface.
1. Toner is fallen on the paper peri-
odically.
(1)Check the cycle of the falling of
the toner.
(2)Check the appearance of both
ends of the developer OPC
drum.
2.The center of the printed matter is
contaminated with toner.
(1)Check whether foreign sub-
stances or toner are stuck to the
terminal (contact point) of the
developer.
(2)Check whether the state of the
terminal assembly is normal.
1. If both ends of the OPC drum are con-
taminated with toner:
Check the life of the developer.
2. Check whether it could be recycled.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer