| Step | Action |
| 1 | Verify the media size used is supported by the printer. Media narrower than A4 (210mm/8.27in.) and shorter than 250mm/9.84in. cannot be duplexed. |
| 2 | Verify the media weight is supported. Media over 28 lb. bond (105 gsm) is not supported for duplex printing. |
| 3 | Ensure the printer is on a flat, level surface. An uneven surface may result in 231.x5 jams, other jams and issues picking paper, or bad image skew. |
| 4 | Ensure nothing is interfering with the sheet when it is being pulled back into the printer after the first side is printed.
Note: Do not touch the sheet while it is reversing. |
| 5 | If there are multiple pages in the duplex path, try emptying the output bin to ensure another page is not getting pulled back into the printer when duplexing. This is especially important if there is narrow media in the output bin. |
| 6 | Check media loading to ensure the side guides are set properly to the media size and are snug against the paper loaded in the tray. |
| 7 | Check that the S1 flag on the Tray 1 rotates freely and returns to its original position. |
| 8 | If the media is longer than Letter/A4 (such as legal, folio, or oficio); - Does duplexing Letter/A4 media function properly?
- Is the longer media being run from an option tray?
Try running Letter/A4 from the same source tray or try running the longer media from Tray 1. |