Samsung SF4500, Service Manual

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Samsung Electronics 8-8
8-4. Printing Quality
8-4-1 White lines on letters or graphics.
■
Cause
If nozzles in print head has a problem, white lines
are marked on the print.
‘Self-Test printing’ will let you know if nozzles have
fallen problems.
■
Solution
1) Run ‘print control panel’ to “clean cartridge” and
check if nozzles have been blocked.
2) Wipe with soft cloth the contact surfaces of ink car-
tridge and carriage, and check if nozzles have been
cleaned properly.
3) Separate ink cartridge from carriage and combine
them. Repeat it about 5 to 6 times and check if con-
nection is proper.
4) Replace ink cartridge and check whether there’s a
problem with thehead.
5) Check if head cable is inserted well into the main
circuit board and then check if nozzles have prob-
lems.
6) Check if head cable is broken or torn and then
check if nozzles have problems.
7) Replace the main circuit board with a new one and
check if nozzles have problems.
If this line is broken, it confirms that
nozzles have problems.