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2 Ensure that you did not mix media types in your media cassette.
3 If you are using media that is heavier than 24 lbs (90 g/m²), ensure that you
have selected the Thick Stock mode.
Ensure that your media does not exceed 43 lbs (160 g/m²).
4 Ensure that your document has more than one page.
5 Go into the printer’s control panel and ensure that duplex is an available
option.
6 In the printer driver (Administration, Paper tab, Duplex Option), choose Flip
on Long Edge (as in a loose-leaf notebook) or Flip on Short Edge (as on a
clipboard).
7 Remove media that is still jammed.
Caution:
Always open the duplexer’s rear cover before opening the printer’s or duplexer’s top cover. Forced opening of the top cover first may damage the unit.Check for media stuck in the paper guides in the duplexer’s top cover, rear cover,
and lower rear assembly.
8 If you removed jammed media from near the OPC belt, reset the OPC belt’s
locking levers.
9 Ensure that all of the covers are closed.
Caution:
Always open the duplexer’s rear cover before opening the printer’s or duplexer’s top cover. Forced opening of the top cover first may damage the unit.Open and then close the covers to confirm that they are securely closed.
10 Ensure that the duplexer’s lower rear assembly is firmly seated in the
printer.
11 If you turned the printer off, ensure that you have turned the printer on again
and waited for it to warm up.