ImageCLASS MF424dw - vertical stripes when doing a double-sided scan

[jiwupro]

Hi there,

My machine is fine with normal printing and single page scanning.  However, when I put documents from feeder doing the double-sided scanning, the even number pages, i.e. P2, P4, P6, so on, has some vertical stripes on the right.

I tried the cleaning but it doesn't work.  Since all odd number pages are fine, there might be dirt from the other side of the scanning unit, which I cannot clean from outside?

Please check the image posted in reply.

Can anyone help?

[jiwupro]

[mreg]

The 2nd side scanner element is in the scanner cover.  Have you cleaned that glass section on the left end of the lid?