HP 3050 - vertical black lines

I would try to clean the adf scanning glass. Check for small fine lines on the glass and use a soft rag with a small amount of isoproplyl alcohol.

Under the Automatic Document Feeder is a small glass.
This glass becomes dirty, creating lines on the page.
open up the scanner cover and clean the glass

If this doesn't appear when printing from computer and olny when copying or faxing, it means that the scanner glass has a spot on it. Please refer to the manual on how to clean the glass window, or go to this page on HP support site to view an image on how to do it:
http://h20464.www2.hp.com/resultsCSR.htm?prodSeriesId=1140783&MEID=A1C54583-26E6-44DA-ACAF-059483D03EE2
The one on the left refers to your model; click the IMAGE button to see an animation.
Please come back with a rating/testimonial if helped.

I would look at the scanner. It is not involved in the printer process but is in the copy process. Clean the glass with a glass cleaner and soft cloth. Remove the glass and also clean the lamp assembly. If either part has a dark mark on it it would leave a line on the copy. If this does not solve your problem and the unit is several years old I would replace the lamp. Let me know if you need more assistance.

Thanks for using FixYa and for the generous rating.

hardrocko

if printing is fine and copying causes line on page, I suspect that there is dirt on the scanner glass. Clean scanner glass.

first, the line are in all printing pages, or only when you make copies?,
if the line are in all printing pages, maybe your fuser has damage the fuser film sleeve,(aprox, 10-20 dlls), if only this line are when you make copies, maybe the glass in the scanner are dirty(clean and try).
i expect this solution your problem

OK, from the desciption i can assume several things here are some option.
If by receipt you are talking about the confirmation the unit prints the the problem is likely dirty glass.
You would also get the lines when you make a copy using the ADF.
Open the lid there are two areas of glass the thin strip is likely dirty and needs to be cleaned.

If by receipt you mean pages you receive from someone else, and not printed or copied on your machine, then their machine has the condition described above.

If everything has the lines then you have a toner or fuser problem:
This is the test to determine toner or fuser issue.
Print a test page
When you hear the paper feed into the machine open the top to stop the machine
Remove the toner cart.
You should be able to see the page with printing on it. (This is before the page hits the fuser)
If you can see the smudge or marks on the page the problem is most likely the cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.
Hope this helps

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. .

I was getting a verticle black line and I had to clean the glass, the long white bar above the glass, and the white and black rollers before my problem was solved.

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.