
One of the following situations may be the cause.
Solutions
Make sure the paper type in the printer settings matches the actual paper type.
Solutions
When printing on plain paper,use a higher quality setting.
Windows
Select High from Quality on the printer driver's Main tab.
Mac OS
Select Fine as Print Quality from the print dialog's Print Settings menu.
Solutions
Align the print head.
Windows
Click Print Head Alignment on the printer driver's Maintenance tab.
Mac OS
Select System Preferences (or System Settings) from the Apple menu > Printers & Scanners (or Print & Scan or Print & Fax), and then select the printer. Click Options & Supplies > Utility > Open Printer Utility, and then click Print Head Alignment.