Cleaning The Color Toner Density (Ctd) Sensor - Dell C1765NFW User Manual

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.
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Maintaining Your Printer