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Hi there and welcome
To confirm, you mean some lines are appearing blank correct during the print?
If so, I want you to do a Nozzle clean
To do this
Open a program, then Click Print on the File menu of your application.
Click the Head Cleaning button in the Utility dialog box
Follow the on-screen instructions to clean the head which should then correct the printing issue.
Let me know the results please
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.