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8–4 IBM Network Color Printer Operator’s Guide
Cleaning the Window of the Density Detection Sensor
When there is a density detection error, or if the window of the density
detection sensor is soiled with toner residue or dust, use the following
procedure to clean the window.
1. Turn off the printer. Open the front door and top cover to see the window
of the density detection sensor.
2. Remove the wire cleaner from inside the printer.
3. Put the brush end of the wire cleaner on the window surface as shown.