Dell 3110cn Service Manual page 229

-Checking the Sensor and Switch
Sensor name (Diag. Code)
Duplex Jam Sensor (DI-1)
Version 1 2006.02.03
NOTE:When performing operation for five minutes or longer with the
front cover open, remove all toner cartridges, and cover the drum to
avoid exposure to light.
1) Turn on the power and enter the Diagnostic Mode.
2) Exeecute the DI-1.
3) Open the Front Cover.
4) Remove the Transfer Belt.
5) Check the sensor.
Actuator
6) Press the "Cancel" key to stop the test.
7) Replace the Transfer Belt.
8) Close the Front Cover.
2 - 15
Chapter 2 Operation of Diag.
Confirmation procedures
Operator Panel
Normal
Kmy02003KA