Dell S3840cdn User Manual page 232

14 Reinsert the removed waste toner box.
CAUTION:
• If the waste toner box does not fit into place properly, make sure that the transfer belt unit is
fully inserted.
15 Turn the waste toner box lock lever 90-degrees clockwise to lock the waste toner
box.
16 Close the right side cover.
17 Close the rear cover.
Cleaning the Raster Optical Scanner (ROS) Window
To prevent deterioration of printing quality due to stains inside the printer, clean inside
the printer regularly by using the cleaning rod whenever you replace drum cartridges.
232
| Maintaining Your Printer