HP Photosmart C4780 - Manual (Page 93)

9. Repeat if necessary for the other print cartridge.
10. Gently close the print cartridge door and plug the power cord into the back of the
product.
Cause: The print cartridge contacts needed to be cleaned.
If this did not solve the issue, try the next solution.
Solution 3: Replace the print cartridge
Solution: Replace the indicated print cartridge. You can also remove the indicated
print cartridge and print using ink-backup mode.
NOTE: During ink-backup mode, the product can only print jobs from the
computer. You cannot initiate a print job from the control panel (such as printing
a photo from a memory card).
Check to see if your print cartridge is still under warranty and end of warranty date
has not been reached.
• If the end of warranty date has been reached, purchase a new print cartridge.
• If the end of warranty date has not been reached, contact HP support. Go to
www.hp.com/support . If prompted, choose your country/region, and then click
Contact HP for information on calling for technical support.
For more information, see:
“Cartridge warranty information” on page 51
Cause: The print cartridge was damaged.
Incompatible print cartridges
Try the following solutions.
• Solution 1: Check the print cartridge
• Solution 2: Contact HP support for service
Solution 1: Check the print cartridge
Solution: Check to make sure you are using the correct print cartridges for your
product. For a list of compatible print cartridges, see the printed documentation that
came with the product.
If you are using print cartridges that are not compatible with the product, replace the
indicated print cartridges with print cartridges that are compatible.
Errors 91
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