Replacing an Ink Cartridge
■When the red 
ink light flashes, one or more ink cartridges are low on ink.
■When the red 
ink light stays on, you need to replace the cartridge(s).
When you print, you’ll also see a message on your screen telling you which cartridge is low or empty.
When a cartridge is more than six months old, you may need to replace it if printouts don’t look their best. If the quality doesn’t improve after cleaning and aligning the print head, you can replace the cartridge even if the red 
ink light is off.
Checking the Ink Supply
To check your ink supply, do the following:
■Windows: 
icon on the Windows taskbar. You see a window like this:
■Macintosh OS 8.6 to 9.x: From the File menu, select Print, then click the 
ink icon.
■Macintosh OS X: Choose Applications > EPSON Printer Utility > SP 900 > Status Monitor.
76 Maintaining Your Printer