Oki C610dtn User Manual page 81

12. If a duplex unit is fitted, lift lever (j) and lower the duplex
unit cover and pull out any sheets found in this area. Close
the duplex unit cover
13. Pull down the MP Tray using the depressions. Lift the front
cover release lever and lower the front cover.
14. Check inside the cover for sheets in this area and remove any
that you find, then close the cover.
j
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– C610/C711 User's Guide