Dell 3010CN Service Manual page 64

Sensor name (Diag. Code)
Tray 1 Paper Path Sensor
(DI-f3)
NOTE: Test for the 250 Sheets Option Tray.
1) Turn on the power and enter the Diagnostic Mode.
2) Execute the DI-f3.
3) Pull the Tray.
4) Open the Feeder Cover.
5) Check the sensor.
6) Press the "Cancel" key to stop the test.
7) Push the Tray.
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Chapter 2 Operation of Diag.
Confirmation procedure
Operator Panel
Actuator
Leg_Sec02_033FA