Dell 2135cn Service Manual page 476

Sensor name (Diag. Code)
Regi Sensor (DI-2)
Exit Sensor (DI-3)
Version 1 2008.02.01
1) Turn on the power and enter the Printer Diag.
2) Execute the DI-2.
3) Open the Front Cover.
4) Remove the PHD ASSY.
5) Check the sensor by An actuator operation.
Operator Panel
6) Press the "Cancel" key to stop the test.
7) Replace the PHD ASSY.
8) Close the Front Cover.
NOTE: Fuser is very hot, so pay sufficient attention at work to above
burns, etc.
1) Turn on the power and enter the Printer Diag.
2) Execute the DI-3.
3) Open the Front Cover.
4) Check the sensor.
Operator Panel
Normal
5) Press the "Cancel" key to stop the test.
6) Close the Front Cover.
2 - 17
Chapter 2 Operation of Diag.
Confirmation procedures
Actuator
Normal
Mnt02005KA
Mnt02006KA