Dell 3130cn Service Manual page 452

Item
CTD SENSOR ON
Version 3 2008.05.30
NOTE: This procedure is for the technical staff.
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 CE Diag.
2) Open the Front Cover.
3) Cheat the safety Interlock System.
4) Execute the CTD SENSOR ON.
5) Click the stop button to stop the LED lighting.
6) Remove the cheater and close the Front Cover.
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Chapter 2 Operation of Diag.
Confirmation procedure
Zna02036KA