1. Page setup is incorrect: Please make sure your page setup is correct, including paper size, margins and orientation. If the page is set incorrectly, the printed content may be cropped or leave a blank area on the paper.
2. Missing fonts or pictures: If a specific font or picture is used in the printed document, but these fonts or pictures are unavailable or missing when printing, a blank line may be printed. Please make sure that the relevant fonts or picture files are correctly installed in your printer.
3. Software setup problems: Some printing software may cause printing problems, such as losing some text or blank lines when printing. You can try to print the same document in different printing software, or reinstall the printing software to solve this problem.
4. Printer driver problem: If your printer driver is damaged or expired, it may cause printing problems. You can try to update or reinstall the printer driver to solve this problem.
If you can't solve this problem, it is recommended that you contact the customer support department of the printer manufacturer for more help.