Defects Associated With Specific Printer Components - Oki ES3640MFP Service & Troubleshooting Manual

Defects Associated with Specific Printer Components

Some print-quality problems can be associated with specific assemblies, the most
common problems and the associated assemblies are listed below. Also, refer to
the printer's Troubleshooting Print-Quality Problems pages or a specific print-
quality troubleshooting procedure for more information.
Imaging Unit
Transfer Unit
Fuser
LED Head
Test Prints
A variety of test prints are available to aid in determining the quality of output
from the printer and to assist in troubleshooting. The next section shows how to
generate and analyze test prints
• Streaks in Process Direction (in the direction of feed,
parallel with paper travel)
• Banding in Scan Direction (across the page,
perpendicular to paper travel)
• Uneven Density
• Voids
• Repeating Defects
• Mis-registration
• Toner on the back side of the printed page
(simplex mode)
• Light Prints
• Repeating Defects
• Mis-registration - only when there is obvious
damage to the belt.
• Hot or Cold Offsetting
• Repeating Defects
• Dark Streaks in Process Direction
• Streaks in the Process Direction
• Uneven Density in the Scan Direction