In The Multi-Purpose Tray - Samsung ML-451 Series Service Manual

4.1.3.3. In the multi-purpose tray

1. If the paper is not feeding properly, pull the paper out
of the machine.
2. Close the MP tray.
If the paper does not move when you pull or if you do
not see the paper in this area, stop and go to the next
step.
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4. Alignment and Troubleshooting
3. Open and close the front cover to resume printing.
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