Dell 3010CN Service Manual page 56

Sensor name (Diag. Code)
TR0 (IBT Rotation)
Sensor (DI-42)
1) Turn on the power and enter the Diagnostic Mode.
2) Execute the DI-42.
3) Open the Front Door and the Top Cover.
4) Pull up the right side lever (Blue of the printer.
5) Remove the drum cartridge.
6) Check the sensor.
7) Press the "Cancel" key to stop the test.
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Chapter 2 Operation of Diag.
Confirmation procedure
Operator Panel
Paper
TR0 (IBT Rotation) Sensor
Leg_Sec02_023FA