Dell 2135cn Color Laser Printer - Manual (Page 178)

Cleaning the CTD Sensor Inside the Printer
Clean the Color Toner Density (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 side button and open the front cover.
3. Clean the CTD sensor inside the printer with a clean dry cotton swab.
4. Close the front cover.
Adjusting Color Registration
To adjust the color registration when you first install the printer or after moving it to a new location, follow the procedure below.
Printing the Color Registration Chart
From the Printer Operator Panel
1. Press until >SETUP appears, and then press .
2. Press until >Admin Menu appears, and then press .
3. Press until >Maintenance appears, and then press .
4. Press until >Color Reg Adjust appears, and then press .
5. Press until >Color Reg Chart appears, and then press .