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Do the following.
1. Make sure the Paper Size has been set correctly, and then fan/decurl the paper.
2. Set No.112 [Paper Feed Mode (Adjust Fan Level)] to [Moderate Dble Fd Red. (Lower)].
3. If the above does not solve the jam, change this setting to [Max Dble Fd Reduc. (Lowest)].
4. Set No.111 [Switch Paper Load Upper Limit] to [High].
If none of the above solves the jam, do the following.
If the paper curl is too strong, even after decurling, or face up curl in front and rear side.
Set No.110 [Side Fan Shutter] to [Active].