4. Troubleshooting
► Error Code
U3–4210
► Error message
Top door of scanner is open
► Symptom
RADF cover-open is opened or
► Troubleshooting method
1) Check if the cover-open is closed correctly.
2) Check the cover-open sensor.
a) Remove 3 screws.
b) Open the Cover-Open. And then, release the stacker by pushing both sides to the direction of arrow.
c) Remove the RADF rear cover.
d) Check the rib of the cover-open and sensor.
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