Ricoh D0C6 IM350
Image Problem. UNEVEN IMAGE DENSITY
Uneven density can occur in 2-by-2 or original halftone or filled areas during continuous print jobs longer than 20 pages with only 5 min. between print jobs.
Cause
The following conditions could make it difficult for toner to move to electrostatic image borders on the development roller and cause worm-eaten patterns to make the texture of images appear uneven.
- The electrostatic attraction of the toner to the development roller has increased due to pressure between the development roller and the OPC.
- The Coulomb force (strength of attraction and repulsion between positive/negative elements) of the electrostatic charge is too low due to large rough areas on the development roller.
Action
- Stop the machine for at least 10 minutes.
- Notch Adjustment
MF model:
User Tools > Machine Features > Maintenance > Adjust Image Density. Press [Darker] for 1to 3 times
Printer model:
Menu > Maintenance > Quality Maintenance > Adjust Image Density: Press 1 to 3 times to get darker - SP adjustment
Set SP2-201-206 (DV bias Control: Coefficient: a6) to from -20 to -120. This value is added to the development bias.