Hp laserjet 3050 scans copy with streaks in windows vista

Please lift the document feeder and clean the scanning glass.

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

Symptom: Black or Blank image while copying or scanning.
Part suspect rating: Scan head..70%
Scan head cable...25%
Formatter...5%
For tech guys only: Remove ADF unit from the printer, remove both side covers of adf, remove & replace scan head, check...
Replace scan head

After installing the printer software you need to program scanning software.
Below are the steps to program scanning software:

To program the Scan To button:

Select Start/Programs or All Programs (Windows XP)/HP/HP Laserjet 3050, 3052, 3055, 3390, 3392/Scan
Click the Setup to open the Scan To Setup Wizard.
Select the Change the destinations that show up on the all-in-one control panel when I press the <Scan To> button and then click Next .
Check the Allow me to scan by pressing the Scan To button on the all-in-one check box.
Choose the destination by moving them from the PC window (the left window) to the All-in-one window (the right window).
NOTE: The All-in-one window might contain items set up by other computers that are connected to the all-in-one. You cannot make changes to these items.
Click Update .
To Create a destinations:
Follow steps 1-2 from the above steps.
Select Create a new destination with settings that I will specify and then select Next .
Select the Save it to my computer and then press Next .
Select the scan preferences and then select Next .
Select the scan destination folder and file format type and then select Next .
NOTE: If you wish to use a custom folder for your scan destination, you will need to create the folder prior to this setup wizard in order to browse to it.
Select the quality level you would like the file to be saved as.
Name the new destination on the computer, check the Send this new destination to the all-in-one check box, and enter a name for the display on the all-in-one. Then select Next .
Confirmation allows you to verify your settings. Select Save .
Once the new destination has been saved, the new destination will be configured as one of the Scan To destinations on the printer.

using PRT screen and menu find clen function and try if this feature will fix the issuw.
Change the cartridge if no results.

Hi,
As i understand that you u r able to print and copy fine which ensure that there is no issue with the connectivity and scanning device.
However next troubleshooting comes in picture is software as per you have mentioned that yoiu have downloaded and installed the complete software couple of times still the issue persists.
In that case we need to Programn Scan to option in the printer software and on your all in one.


HP LaserJet 3050, 3052, 3055, 3390 and 3392 AiO Printer series - How to Program the Scan To Button and Create New Destinations
Information
The Scan To button must be programmed before it can get used. However, some destinations are programmed by default if the all-in-one is directly connected to the computer.
Details
To program the Scan To button:
Select Start/Programs or All Programs (Windows XP)/HP/HP Laserjet 3050, 3052, 3055, 3390, 3392/Scan
Click the Setup to open the Scan To Setup Wizard.
Select the Change the destinations that show up on the all-in-one control panel when I press the <Scan To> button and then click Next .
Check the Allow me to scan by pressing the Scan To button on the all-in-one check box.
Choose the destination by moving them from the PC window (the left window) to the All-in-one window (the right window).
NOTE: The All-in-one window might contain items set up by other computers that are connected to the all-in-one. You cannot make changes to these items.
Click Update .
To Create a destinations:
Follow steps 1-2 from the above step
Select Create a new destination with settings that I will specify and then select Next .
Select the Save it to my computer and then press Next .
Select the scan preferences and then select Next .
Select the scan destination folder and file format type and then select Next .
NOTE: If you wish to use a custom folder for your scan destination, you will need to create the folder prior to this setup wizard in order to browse to it.
Select the quality level you would like the file to be saved as.
Name the new destination on the computer, check the Send this new destination to the all-in-one check box, and enter a name for the display on the all-in-one. Then select Next .
Confirmation allows you to verify your settings. Select Save .
Once the new destination has been saved, the new destination will be configured as one of the Scan To destinations on the printer.

You should go to HP.com and look for a TWAIN scanner driver the works for that printer in Vista.

when we copy or scan we get lines at both side throught
the paper

make sure u go to the HP site and download the latest version of HP operating software or u will need to contact HP support

Check the scanning glass bar. If you scanned something that had whiteout on it, a lot of times some of the whiteout will get on the glass and will cause streaks in the prints. Clean it with alcohol.