Dell 3110cn Service Manual page 257

Clutch and Solenoid name
(Diag. Code)
ADC Senor LED (DO-39)
OHP Sensor LED (DO-3b)
Version 1 2006.02.03
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 Diagnostic Mode.
2) Open the Front Cover.
3) Cheat the safety Interlock System.
4) Execute the DO-39.
5) Press the "Cancel" key to stop the LED lighting.
6) Remove the cheater and clode the Front Cover.
Not used
2 - 43
Chapter 2 Operation of Diag.
Confirmation procedure
Kmy02036KA