Try this approach to fix the printhead problem:1. Open the printer cover > remove the ink tanks > open the printhead latch > remove the printhead > close the printhead latch.2. Visit the Lexmark website to download and install the Lexmark Pro700 Series Firmware Update.3. After the update is successful, open the printer cover > open the printhead latch > re-install the printhead > close the printer cover > if no error appears, continue with normal installation steps for cartridges. If error still appears, try to remove and re-insert the printhead firmly.
4. Try to print again to verify that the problem is fixed.
Should the error persist, it could be that the printhead itself is faulty. If that's the case, please contact Lexmark Technical Support for further assistance.
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