Samsung SCX3400

1. Vertical Black Line and Band

• Description : Straight thin black vertical line occurs in the printed image.

Check and cause	Solution
• Damaged develop roller in the toner cartridge. Deformed Doctor-blade or cleaning-blade.	Replace the toner cartridge.
• Scratched surface of the charge roller in the toner cartridge	Replace the toner cartridge.
Partly depression or deformation on the surface of the transfer roller.	Replace the transfer roller.

2. Vertical White Line, Band

• Description : White vertical voids occurs in the printed image.

Check and cause	Solution
Foreign matter stucks onto the window of internal lenses of LSU mirror.	Clean the LSU window with recommended cleaner (IPA). Clean the window with a clean cotton swab.
The life of the toner cartridge has been expired	Replace the toner cartridge.
Some foreign substances are on the window of the toner cartridge frame.	Remove the foreign matter of the exposure window.
If the fuser is defective, voids occur periodically at the top of a black image.	Open the rear cover. Reinstall the fuser unit.

3. Horizontal Black Band

• Description : Dark of blurry horizontal stripes occur in the printing periodically.

Check and cause	Solution
Bad contacts of the voltage terminals to toner cartridge.	Clean each voltage terminal of the Charge, Developing, toner cartridge and Transfer roller. (remove the toner particles and paper particles)
The rollers of developer may be stained. • OPC Drum = 75.4 mm • Charge Roller = 37.7 mm • Developing Roller = 44.2 mm	Replace the toner cartridge.