black line on adf scans only

[frustratedintx]

First scan is fine on a freshly turned on printer, but second scan has single vertical line on each page.  Can clear and start fresh by turning printer off and on, but only good for 1 scan, then line(s) appear again.  Followed all instructions for cleaning and made no difference.  No lines when using flatbed scanner. HELP!

[Repairatrooper]

Black lines are 99% of the time dirt or contamination. Scan the document and take the printed copy with the defect open the lid and line up the defect copy with the paper path the original would follow and the defect will show you exactly where you need to look. Even a small spec of adhesive from a sticky note, which is clear and hard to see can cause this defect. Also check the feed area as sometimes a little bit of paper can get in there and move around and cause random defects.

[east2100]

Check here it'll help.

https://h30434.www3.hp.com/t5/LaserJet-Printing/Vertical-lines-on-CM1415/m-p/7152315#M372672

[frustratedintx]

Thanks for your answer but re-cleaned everything and first scan is fine but the line still appears the second time I do a scan.

[east2100]

If first page's scan is fine then it points out that you got the right way.

Check carefully the pathway of ADF while sacn to see if there's anything else you can do.

[frustratedintx]

Realized my post isn't clear.  First adf scan of multi pages = no line.  After file saved and a new scan done, line appears on all pages; same happens on subsequent scans.  If I turn printer off and wait a minute, next time I scan multi pages = no line, but lines appear on next scans done.  Thinking must be something electrical since I can clear for one scan by powering down?