Line all the way down the page when scanning on hp 3050

yes. its the main board. OR clean the mirrors. see You Tube.

No PC model stated
no OS stated (opr. system) windows 10?
we can not help you, ever lacking key facts
why not go to your HP support page and load all software
Related to Laserjet 3050

here

https://support.hp.com/us-en/drivers/selfservice/hp-laserjet-3050-all-in-one-printer/1140783/model/1140778

Lines on scanned and copied documents is usually caused by something on the scanner glass such as ink, correction fluid or trash. Open the top of the printer and clean the scanner glass surfaces with windex and paper towels. See this article for more details:

http://www.ccl-la.com/blog/index.php/lines-on-scanned-or-copies-pages/

The way this ADF works is that there is a stationary scanner head and the machine moves the paper over it. The line down the pages is due to debris stuck between the page and the scanner. The ADF panel should open to show you the glass that needs cleaning. See the link below for full instruction. You should be able to test this by making a copy.

Rena,
Put ALLof the pages into the sheetfeeder all at once.
The scanner will automatically scan all pages.
The sheetfeeder may only accept 30 pages, so you may have to do two scan jobs.
-Gort.

If you are scanning using the Auto Document Feeder be sure to clean the glass where the documents get scanned. A small speck will cause a line down the page. On HP there is often a narrow strip of glass on the left side of the platen glass.

Check scanner glass and clean. Further test - Scan from the computer. If the line is still present, the scanner CCD is failing and requires service as there is no user servicable part inside.

When I Copy or Scan with my HP LaserJet 3050, a solid black line appears on the left margin of the page. . Can you suggest any solution to the problem. .

hp laserjet printer 3050 reinstall pritner driver.

I had a hp 3050 yesterday with two vertical lines running down the page when making a copy. All I had to do was to pull open the top cover where you put the paper you want copied and cleaned the glass strip with a rag and alcohol and the lines were gone.