HP Deskjet 3520 printer does not print black

If you are running with such and you are unable to resolve it on their own, so . You don’t need to worry, just follow all the steps below to fix this error.

1. Step 1: Check your Printhead
   

   ☑ Check your Printhead 
   ☑ If switching ink cartridges doesn’t work. Ensure that your Printhead isn’t obstructed. Clean your Printhead manually if you can remove it. 
   ☑ Into a paper tray load plain, white paper.
   ☑ In the control panel, select the setting press down arrow, and after that click on ok.
   ☑ To select tool, press down arrow and now press ok
   ☑ To select clean Printhead, press down arrow, and then press ok.
   The process to clean the HP Deskjet printer Printhead is completed now. Take a sample to print a page to ensure that error is resolved or not. If the error persists, then continue to the next section.
   
    Align your Printhead
   
   ☑ In the paper tray used plain or white paper to load letter size paper or A4 size.
   ☑ In the control panel, to select settings press down arrow, and now press ok.
   ☑ To select tools, press down the arrow, and then press ok.
   ☑ To select align printer press down arrow and press ok.
   ☑ Now an alignment page is printed.
   ☑ Now open the lid
   ☑ On the scanner glass with the printed side down place your alignment page and now position the page on the glass [front right corner].
   ☑ To scan the alignment page close the lid and click on ok option.
   After alignment is completed, recycle or discard it.   

2. Step 2: Replace the ink cartridges
   

   ☑ If there is any defect on the print quality so replace the ink cartridge. For e.g.,
   ☑ Any magenta color bars are faulty then replace it. After replacing ink cartridges, the printer will give a prompt on the display panel asking to print an alignment page. 
   ☑ Turn on your printer.
   ☑ Wait for a minute until the printer is idle.
   ☑ Now open the ink cartridge access door and then promptly replace the ink cartridge.
   ☑ To remove the plastic wrap from the ink cartridge pull up the orange tab.
   ☑ Rotate and turn the orange color cap until it breaks.
   Insert the ink cartridge into its color-coded slot with nozzles and contacts facing down.
   ☑ Press down on the ink cartridge and to replace any other ink cartridge repeat these steps.
   ☑ Now close the cartridge access door.
   
   Align the printer
   
   ☑ The printer automatically prompts you to print an alignment page after you load new ink cartridges and close the ink cartridge access door.
   ☑ Into a paper tray load white or plain paper. 
   ☑ From the Control Panel click on the ok option.
   ☑ Now an alignment page is printed.

3. Step 3: Use scan doctor
   

   ☑ To download the software setup wizard click on the HP print and scan doctor link on the HP page.
   ☑ To install HP print and scan doctor click on HPPS.dr.exe.
   ☑ To select your HP printer click start and now press the next button.
   ☑ Now select the fix printing option.