Dell 5110cn Service Manual page 211

Sensor name (Diag. Code)
Cassette 4 Size (DI-50)
1) Turn on the power and enter the Diagnostic Mode.
2) Execute the DI-50.
3) Push and pull the tray 4, and check the message.
Operator Panel
Displays the paper size
4) Press the "CANCEL" key to stop the test.
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Chapter 2 Operation of Diag.
Confirmation procedures
Ida_Sec02_030FA