Samsung MultiXpress X4 Series Service Manual page 557

4. Troubleshooting
4.9.3. Adjusting the Scan FR Carriage Flatness
1) Remove 7 screws. And then, release the scan front cover and scan glass holder cover.
2) Lift the scan glass up and release it.
NOTE
Be careful not to contaminate the scan glass.
3) Tap 4 corners of the FR carriage to check the direction that adjustment is needed.
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