Issues with HP officejet pro 7740

[User4344]

Hi, I’ve a problem with HP OfficeJet pro 7740: when I print an A3 image in colour, it doesn’t print the coloured image but in a grayscale. I tried to clean the heads but it doesn't work. Instead if I print in A4 the colours are just a little faded. 
thanks 

[Nal_NR]

Hi @User4344,

Welcome to the HP Support Community. 

I'd be glad to help you! 

Check for issues with the ink cartridges

• Very low ink levels and using non-HP cartridges can cause print quality issues.
• Replace any non-HP or refilled cartridges with genuine HP cartridges. HP supplies are available from the HP Store and local retailers.
• HP cannot guarantee the quality or reliability of non-HP or refilled cartridges. Go to HP Anti Counterfeiting and Fraud Program for more information.
• On the printer control panel, swipe down on the touchscreen to open the Dashboard, and then touch the Ink Level Indicator icon .
• Check the ink levels and replace any low or empty cartridges.

• Rough handling of cartridges during transport or installation can cause print quality problems. Wait a few hours for the automatic servicing routine to complete, and then try to print again.
• If you have a defective HP cartridge, it might be under warranty. Go to About Original HP Cartridges for page yield and HP Limited Warranty information.

Click here for the remaining steps. 

Update the firmware. Click here

Hope this helps! Keep me posted for further assistance

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