hello friends, I am having the same problem but in my case, I have observed that when I set the original to A4 and use A4 paper for duplexing, it jams in the duplex unit with one side printed. When I pull out the duplex unit, the paper is stuck between the duplex guides and the gap between the guides is only 11.5 inches instead of 11.75 inches. so the paper can't pass through.
Then just for testing purpose, I set the original size to letter and print on the A4 paper and it didn't jam and upon having a look on the duplex guides, I found out that the gap was wide open. repeated this for 100 duplex prints so I don't think the rollers are the culprit
The guides in the duplex unit are not recognizing the paper size correctly and pushing the paper in length which is causing the jam. What shall I do to maintain the correct gap between the duplex guides? do some adjustments in maintenance mode or clean some sensors? I have already cleaned the switchback roller and the white roller.
PS. The jam also occurs when I print from my computer.
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