Samsung ML-3471ND - No error message when the cover is open

Adjustment and Troubleshooting
Service Manual
4-55
Samsung Electronics
7) No error message when the cover is open
1. Check the connector and
circuit of the cover switch department
in the Main Control board.
Perform EDC mode
1. Check the insertion of the
Cover Open S/W Connect.
2. Replace the Main Control
board or Cover Open S/W.
Description: The ERROR message does not come on even when the printer cover is open