Samsung MultiXpress K4 Series Service Manual page 459

2) Tray1, Tray2, MP Tray can not pick up the paper.
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Symptom : Tray1, Tray2, MP Tray can not pick up the paper.
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Cause :
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Bad harness connection on the main board
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Connector defect of the main board
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Troubleshooting
1) Check the harness connection. If the harness is not connected correctly, reconnect it.
2) Check the pick up unit connector on main board.
If the connector has some problem of soldering, replace the main board.
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4. Troubleshooting
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