Dell 1135N Service Manual page 132

7) No error LED when the cover is open
Description : The Error LED does not come on even when the printer cover is open
1. Check the connector and
circuit of the cover switch department
in the Main Control board.
Service Manual
Alignment and Troubleshooting
1. Check the insertion of the
2. Replace the Main Control
4-59
Cover Open S/W Connect.
board or HVPS board