This is the sight that greets you when you lift the cover on the i9100 printer.
Rather than seeing the usual two color and black cartridges there's this most
impressive looking print head assembly with six separate ink tanks.
Here's the print head with its 3,072 print nozzles and three of its six ink tanks.
Not only can the user replace the individual ink tanks but you can also replace the
entire print head if necessary. (Replacement print heads are available from Canon
Service after it is determined that a replacement is necessary.) Epson printers require
a trip to the service center if they encounter a print head problem.
Optical ink sensors automatically monitor all ink color levels and communicate with your computer--giving you a pop-up message indicating exactly what colors are running low. You can also check the status of the ink tanks at any time using the Status Monitor of the driver as shown above.
Canon's optical low ink detection system prevents wasted printouts by
notifying you via the Printer Status Monitor before any ink tank becomes
empty, so you'll never unexpectedly run out of ink in the middle of a job again.
A light beam shines through a prism located at the bottom of each ink tank. When there is sufficient ink, the light is detected by the sensor. When only about 20% of ink is left in any of the ink tanks, the light beam is refracted, triggering the sensor which tells the printer driver to display a low ink tank notification for that ink tank.
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