LBP6230dn show Jam error when print 2 sides

[anhseo9m]

   My 6230dn print fine with 1 side for all documents but when use the 2 sides setting, firt page go fine out side then machine so jam. Ive checked all part but nothing inside machine jam.
 Can you help me, may be a sensor error >?

[Hector]

Hello Anhseo9m,

If the paper jams whenever you try a duplex print, it will usually point to an obstruction in the paper feed path or a problem with the paper feed rollers. To make sure the paper feed path is clear, make sure to open the rear cover and check the full paper feed path using the steps in the link provided HERE.

If the path is clear, it would mean the printer needs service. You can contact our support team at 1-800-652-2666, our agents would be happy to assist and can provide your service options.