Scanned documents on my 7740 with ADF have vertical line

[CalgaryYukon]

There is a vertical line on scanned documents using the ADF. No line if I use the flatbed. I have cleaned the glass I understand the ADF uses and still have the problem

[Andr-1611]

Hello CalgaryYukon ,
Welcome to the HP Support Community!

This glass surface must be thoroughly cleaned.

Kind Regards
Andr-1611

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[CalgaryYukon]

Thank you for your help. I think I have cleaned all the visible glass surfaces on the lid and on the main printer part. I  only get the vertical lines when I use the ADF, not when I use the glass scanner manually. Any suggestions?

[Repairatrooper]

Even nearly invisible scratches can distort the scanner and cause lines. the best way to check for these minor defects or debris is to use a very bright flashlight and look at the glass from a low angle. 

[Andr-1611]

Hi @CalgaryYukon ,

take a look at this solution here: Printer Maintance 
A magnifying glass and a flashlight are very helpful.

Kind Regards
Andr-1611

If my post resolved your problem please mark this post as an "Accepted Solution".
Or click on the YES button to reply that the response was helpful and/or to say “Thank You”.

[CalgaryYukon]

Got the flashlight out and had a close look. Still have the line. The line issue started when I used the ADF while I had a document on the glass. The ADF fed the new document over the document on the glass. Since then, the line remains. Will get a magnifying glass as it is a lower cost option than a new printer. My 7740 has been a reliable beast for many years and is costly to replace. Plus I have a bunch of ink for it, about $300. Will shop for a printer that uses the same ink.

[Andr-1611]

OK,

but please scan a blank A4 sheet via the ADF first, as described in the link above, and then upload it here.

[CalgaryYukon]

How do I upload here?

[Andr-1611]

@CalgaryYukon 

1. Scan a blank A4 sheet (at 300 dpi) and save as a jpeg.
2. upload it here, click on the icon "Insert photos"
3. then "choose a files"
4. select the file with the extension: jpeg
5. click "Done"

[CalgaryYukon]

 

 I think I uploaded the file but do not see it. I dragged and dropped the file. Is that how to do it?