Lexmark S510 - Manual (Page 142)

3 Reattach the paper support until it clicks into place.
4 Touch OK or press , depending on your printer model.
Paper jam in the duplex unit
Note: The parts inside the printer are sensitive. Avoid unnecessarily touching these parts while clearing jams.
1 Push down the duplex latch, and then remove the duplex unit.
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Troubleshooting 142