4. Troubleshooting
► Error Code
U3-4210
► Error message
Top door of scanner is open
► Symptom
DSDF cover is open.
► Troubleshooting method
1) Close the DSDF cover properly.
2) If this error occurs continually, check the following:
a) Check the DSDF cover open sensor and its harness. If there is a defective part, replace it.
b) If both of them are normal, check the Cover-Open Rib. If it is broken, replace the Cover-Open.
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