Printing Quality Problems - Samsung SCX-6545N Service Manual

4.2.2.3 Printing quality problems

Condition
Light or faded print
Toner specks
Dropouts
Vertical lines
Gray background
Service Manual
Alignment & Troubleshooting
If a vertical white streak or faded area appears on the page:
• The toner supply is low. You may be able to temporarily extend the toner cartridge
life. If this does not improve the print quality, install a new toner cartridge.
• The paper may not meet paper specifications; for example, the paper is too moist
or too rough.
• If the entire page is light, the print resolution setting is too low or the toner save
mode is on. Adjust the print resolution and turn the toner save mode off.
• A combination of faded or smeared defects may indicate that the toner cartridge
needs cleaning.
• The surface of the LSU part inside the machine may be dirty.
• The paper may not meet specifications; for example, the paper is too moist or too
rough.
• The transfer roller may be dirty. Clean the inside of your machine.
• The paper path may need cleaning.
If faded areas, generally rounded, occur randomly on the page:
• A single sheet of paper may be defective. Try reprinting the job.
• The moisture content of the paper is uneven or the paper has moist spots on its
surface. Try a different brand of paper.
• The paper lot is bad. The manufacturing processes can cause some areas to
reject toner. Try a different kind or brand of paper.
If black vertical streaks appear on the page:
• The surface(drum part) of the imaging unit inside the machine has probably been
scratched. Remove the imaging unit and install a new one.
If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be dirty. Clean the LSU.
If the amount of background shading becomes unacceptable:
• Change to a lighter weight paper.
• Check the machine's environment: very dry (low humidity) or high humidity (higher
than 80% RH) conditions can increase the amount of background shading.
• Remove the old drum and toner cartridge and then, install a new one.
Suggested solutions
4-105
Samsung Electronics