Troubleshooting - Samsung SCX-4200 Series Service Manual

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6. Troubleshooting

6.1 Printing Problems – Causes and Solutions
6.1.1 Vertical Black Lines and Bands
• Description
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
6.1.2 Vertical White Line
• Description
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Samsung Electronics
1. Straight thin black vertical lines occur in the printing.
2. Dark black vertical bands occur in the printing.
Check and Cause
1. Damaged developer roller, deformed
Doctor-blade in the Toner cartridge.
2. Scratched surface of the charge roller in
the toner cartridge.
White vertical voids in the image.
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.
Solution
1. Replace the toner cartridge and test
again.
2. Replace the toner cartridge and test
again.
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.
Troubleshooting
Service Manual
6-1