C9C70000 code in Blue background on control panel of HP7740

[Botashney]

I am getting a blue background on the control panel of a HP7740 printer with the code C9C70000. I can't get the print head and cartridges to move and have tried disconnection power and usb cable as suggested.

[A_Gayathri]

Hi @Botashney ,

Welcome to HP Support Community.  

Thank you for posting your query, I will be glad to help you.

The error code "C9C70000" on the control panel of your HP OfficeJet Pro 7740 Wide Format All-In-One Printer indicates a hardware issue. Since you've already tried disconnecting the power and USB cables without success, here are a few additional steps you can try:

Restart the Printer:

• Turn off the printer.
• Disconnect the power cord from the back of the printer.
• Wait for about 60 seconds.
• Reconnect the power cord.
• Turn on the printer.

Check for Obstructions:

• Ensure that there are no obstructions preventing the movement of the print head or cartridges.
• Open the printer cover and check for any paper jams or foreign objects.

Perform a Hard Reset:

• Turn off the printer.
• Disconnect the power cord from the back of the printer.
• Disconnect the other end of the power cord from the power outlet.
• Wait for about 2-3 minutes.
• Reconnect the power cord to the power outlet.
• Reconnect the power cord to the back of the printer.
• Turn on the printer.

Update Firmware:

• Check if there's a firmware update available for your printer on the HP support website. If available, download and install the latest firmware.

Check for Physical Damage:

• Inspect the printer for any signs of physical damage, especially around the area where the printhead and cartridges are located.

I hope this helps. 

Take care and have a good day.-

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