Previous
When printing on side 2 for duplex printing, due to downward curling, paper is caught at the paper transfer belt, causing a paper jam.
Decurling method
Because this problem occurs while printing, the paper needs to be decurled before printing on side 2.
Perform "Decurling Type 1" in Table 1 on side 2.
By decurling side 1 of the paper downward, you can print on side 2 with the paper decurled upward.
Decurling for jam codes J031 is effective for duplex printing only. This type of decurling is not effective for single-sided printing.
In the 03: [Machine: Paper Feed/ Output] group on the [Adjustment Settings for Skilled Operators] menu, select 0301: [Adjust Paper Curl].
Select [The paper tray' name (1 Sided)].
For example, to decurl the paper fed from Tray 1, select [Tray 1 (1 Sided)].
Select [Adjust 
Curl: Weak], [Adjust Curl: Medium], or [Adjust Curl: Strong].
Select the degree of decurling from "Weak", "Medium", and "Strong" according to the degree of curling. If you cannot assess the degree of curling, try decurling in the order of "Weak", "Medium", and "Strong". Decurling more than necessary may cause a paper jam, scratches, or sheets being bent at corners.
