Dell 5110cn Service Manual page 206

Sensor name (Diag. Code)
Tray 3 No Paper (DI-13)
1) Remove the Tray 3.
2) Turn on the power and enter the Diagnostic Mode.
3) Execute the DI-13.
4) Move the Actuator No Paper on the Paper Pickup Assembly of
Tray 3 to check the sensor by finger.
Check the number on the control panel is counted up.
5) Press the "CANCEL" key to stop the test.
6) Reseat the Tray 3.
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Chapter 2 Operation of Diag.
Confirmation procedures
Operator Panel
Actuator
Operator Panel
Actuator
4)
Ida_Sec02_020FA
4)
Ida_Sec02_021FA