Ricoh SAVIN D0AP Service Manual page 540

6.5.9 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
1. Stop the machine for at least 10 minutes.
2. 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
3. SP adjustment
Set SP2-201-206 (DV bias Control: Coefficient: a6) to a value between -120 and -20. This
value is added to the development bias.
D0AP/D0C4/D0C5/D0C6/M0BQ/M0D1 6-94
Other Troubleshooting
SM