Samsung CLX-8640 series Service Manual page 415

v) Remove the Cover-Open Assy. Remove 6 screws. And remove the bottom cover.
vi) Check if the sensor and actuator are assembled correctly.
4) Check if there are any obstacles or contamination in the paper path. Remove it.
5) Close the ADF cover.
6) Open the DADF unit.
a) Check if the reflection film is contaminated. Clean it.
b) If the problem persists, check the followings.
i) Open the DADF cover.
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4. Troubleshooting
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