dann dope

asked Feb 8, 2018 at 3:02pm
Canon Canon Pixma MX860

Page gradually shifts in the ADF

Hi,

My Canon Pixma MX860's auto document feeder grabs the paper correctly and scans the top part correctly (not slanted). However, somewhere around two-thirds of the page, the paper that is still being scanned starts to shift slightly. Near the end of the scan (does it for every single sheet), the roller spins faster to eject the document, but the latter shifts considerably in the same direction as before.

This results in a good-looking scan of the top of the page, and a terribly shifted bottom third.

It seems to me the rollers of the ADF are not properly calibrated left and right, hence shifting the paper as it goes through, but that's nothing more than a guess... (My settings are set for the correct paper size, A4). How can this be fixed?

Thank you for your help,

Dann

I've never seen rollers cause shifting and I've worked on tens of thousands of printers. Most likely cause would be some obstruction in the paper path on the one side that is deflecting it.

by moe on Feb 8, 2018 at 8:32pm Add comment

Thank you for your answer !

I've linked a video showing exactly what's happening. The problem begins at ~55s.

I've also checked and did not find anything blocking the way of the paper. Actually, the shifting only happens once the paper has parted with the first set of rollers.

https://drive.google.com/file/d/13Mp1RillHvMSwEZBIU-i64kY1fDLiF7q/view?usp=sharing

by dann dope on Feb 9, 2018 at 4:25pm Add comment

That is really strange behavior. It does look like something restricting the movement on the left side near the end. I would suggest shining a flashlight down the top of the paper as it exits and see if you can tell what is happening.

by moe on Feb 9, 2018 at 4:53pm Add comment