Wrong Print Position - Samsung SCX-4720F Service Manual

7.3 Paper Feed Problems – Causes and Solutions

7.3.1 Wrong Print Position

• Description Printing begins when the paper is in the wrong position.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
7.3.2 Vertical White Line
• Description White vertical voids in the image.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Samsung Electronics
Check and Cause
A defective feed sensor actuator can cause
incorrect timing.
Check and Cause
1. 1. Contamination of the window or
internal lenses of LSU mirror.
2. Foreign object inside the toner cartridge
or low toner.
3. Foreign object, contamination or burr on
the edge of the toner cartridge window.
4. If the fuser is defective, voids occur
periodically at the top of a black image.
5. Contamination of the OPC drum.
6. Depression or deformation of the surface
of the transfer roller
Solution
Replace the defective actuator
Solution
1. Clean the LSU window with recommended
cleaner (IPA) Clean the window with a
clean cotton swab. If dirt is inside the LSU
– replace LSU.
2. Replace the toner cartridge.
3. Clean the exposure window.
4. Open the front cover and check the ribs
that correspond to the position of the
voids. Remove if found.
5. If the problems are not solved, replace
the toner cartridge.
6. Replace the transfer roller.
Troubleshooting
Service Manual
7-9