Samsung ProXpress M456x Series Service Manual page 213

► Error Code
S3–3121
► Error message
Scanner is locked
► Symptom
Scanner module does not move. / Scanner lock error has occurred.
► Troubleshooting method
1) Check if the CIS unit is moving when power on.
2) Check if the flat cable is connected to the CIS unit properly. Reconnect 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.)
• Gear-Belt
• Scan drive unit
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4. Troubleshooting
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