Samsung ML-451 Series Service Manual page 149

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4. Alignment and Troubleshooting
4) Check if the Empty/ Pick up/ Regi-Act sensor is working properly.
5) Check if the main board/ motor/ clutch connector are connected properly.
6) Check if the AS-SPRING_ES is deformed or assembled properly.
7) Check if the Press D-cut of the Gear-Lifting is broken.
8) If the problem persists after checking No. 1~7, replace the SCF main board.
9) If the problem persists, replace the Drop connector harness.
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Ml-501 seriesMl-451 nd seriesMl-501 nd series

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