Canon S820MG, Service Manual

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Part 3: Technical Reference
1. NEW TECHNOLOGY
1.1 Borderless printing
To allow printing of the entire paper surface, and an area exceeding the paper surface,
borderless printing has been enabled. The difference from printers to date not capable
of borderless printing is that the paper size may or may not need to be set in the
application being used.
1. When borderless printing is selected in the driver, the driver instructs the application
to send the entire data set for the paper size. At this point, the size of the requested
data is finely adjusted according to the "Amount of Extension" setting.
2. The application sends data to the driver according to the specific request.
3. The driver sends the data to the printer.
4. The printer then prints the received data.
1.1.1 Borderless printing limitations
When printing the entire paper surface, or an area exceeding the surface, the
following issues may arise.
(1) Dirty platen ink absorber
The platen ink absorber becomes dirty with ink. When cleaning the platen, be
careful not to get this ink on the platen itself.
(2) Friction with the head caused by curled paper
Since there are no paper depressors, if curled paper is fed it can interfere with the
print head and spoil the printout. Prevent paper curling by properly adjusting the
paper thickness lever.
(3) Lowered speed
With the increase in vertical passes, the throughput speed of borderless printing is
lower than ordinary printing.
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