User's Manual

Maintaining Your Printer 269
9 Replace the black cartridge by adjusting it to the associated cartridge
holder, and then insert it firmly by pressing near the center of the label
until the cartridge clicks.
10 Replace the other three cartridges as well.
11 Close the toner access cover.
Cleaning the Color Toner Density (CTD) Sensor
Clean the CTD sensor only when an alert for the CTD sensor is shown on the
Status Monitor or operator panel.
1
Ensure that the printer is turned off.
2 Push the rear cover release handle and open the rear cover.