Epson LX300 printer Error in printing lines

Epson LX300 printer Error in printing lines
I am printing a report in table format. My printer is Epson LX300 connected directly in my computer.
The page is printed in landscape mode in a short bond paper. Letters and number and special characters are printed correctly.
The only problem is the borderlines of the table printed like a sine wave.
No straight lines are printer.
How can I solve this?
