hp deskjet 3720

[maudiequinn]

Do I need to replace both ink cartridges ? I have just replaced one and printer is not working ? do they both need to be same type ?

[Anand_Andy]

Hi @maudiequinn,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Deskjet 3720. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• Are you using genuine HP ink cartridges?
• Which ink cartridge have you replaced now?
• Does the copy work fine?
• What's the application you are trying to print from? 
• Have you tried printing from a different application or device?
• What Operating System is running on your device? 

While you respond to that, please go ahead and try the single-cartridge mode:

The printer you own can work in single-cartridge mode, wherein the printer will be able to print with one cartridge in the printer. This will help us identify if its a cartridge issue or a printhead issue 

To try single-cartridge mode follow the below steps:

• remove the black ink from the printer, leave the color in and try printing 
• then remove the color ink and, insert the black  in and try printing 

 Perform a power drain: 

• With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
• Remove USB cable, if present.
• Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
• Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord (This is important) and then plug back the power cord to the printer.
• Turn on the printer and wait till warm-up period finishes and the printer is idle

let's print a Print Quality Diagnostic page -Post the Print Quality Diagnostic page here so we can help you further. 

You may also refer to this document with steps to fix the " Print Quality Issues" issue applicable to your printer -  Print Quality Issues

Update the printer firmware 

Click here to download and install the latest printer firmware from your product

Click here to know different methods of updating printer firmware.

Hope this helps! Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!