Samsung SCX-4100 Service Manual page 82

7.4.7 No error message when the cover is open
• Description
The Cover Open message does not appears on the LCD even when the print cover is open.
Check and Cause
1. The 'Open Cover' microswitch may be stuck or faulty
2. Check the connector and cables between Switch and
main PBA.
Samsung Electronics
Solution
1. Use TECH mode("cover sensor test") to check
cover switch operation. Check and replace switch if
necessary.
2. Replace the Main Control board or Cover Open
S/W as necessary.
Troubleshooting
Service Manual
7-17