4. Alignment and Troubleshooting
► Error Code
S2–4120
► Error message
Door is open. Close it.
► Symptom
Door is open or the cover open switch is defective.
► Troubleshooting method
1) Check if the front cover is closed perfectly.
2) If the error persists, check that the cover-open sensor is working normally. If it is defective, replace it.
► Error Code
S3–3121
► Error message
Scanner is locked.
► Symptom
Scanner lock error has occurred. CIS does not move.
► Troubleshooting method
1) Check if the CIS unit is moving when power on.
2) Check if the at cable is connected to the CIS unit properly. Re-connect or replace the cable.
3) If the CIS is defective, replace it.
4) Check if there is any defective part in the scanner unit. (Gear, Belt, Motor etc.)
5) If the problem persists, replace the main board.
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