Epson SureColor P900 17" Photo Printer - Manual (Page 76)

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You see a window like this:
4. Select any of the following options, as necessary:
• Nozzle Check to print a nozzle check pattern to check whether the print head nozzles are
clogged.
• Head Cleaning to clean the print head if you notice banding or gaps in your printouts.
• Print Head Alignment to align the print head if your printouts are blurry or have vertical or
horizontal lines.
• Epson Status Monitor 3 to check the printer's status.