Samsung ML-3051ND duplex skew

[nomadtech]

Hello, this is my first post in this trove of copytech knowledge.

First off the description of the issue with the printer (Samsung ML-3051ND):

• when printing double-sided the front page shows a skew (clockwise ~ 5deg, sometimes less)
• the back page shows no skew
• when printing single-sided, the front page does not show any skew
• the skew looks as if the image is slightly rotated clockwise
• no problems with overall quality of the printed image
• usually no jamming; no errors

After an occasional jam (too many sheets picked up from feeder), the first duplex-print is skew-free, but next duplex-print is skewed again.

I checked the paper-path for any debris, and it looks clear.
The duplex unit looks visibly clean too.

I got hold of exploded parts view to get better understanding of the internals, but not sure where to direct my prying eye.

I appreciate any ideas about possible reasons for the duplex-only skew.

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[nomadtech]

I posted the question, I found the solution too (eventually

In short, the following rollers got a brush up -- duplex unit rollers, exit, feed.

The duplex unit in this model is rather basic, rollers are only on one side, so these wear faster and may lead to a slight slip. However the exit rollers are the ones that initially drive the page into duplex unit. So both of these would be to check first. Then also a set of idler rollers at the exit from the fuser.
Finally, once the pages is reversed it has to be grabbed by the feed roller, so it may also need a look (however it supposed to work the same for simplex, which works ok in this case)

Hope it helps to anyone else with duplex skew.