Canon S820MG Service Manual page 199

When borderless printing on normal paper,
the trailing edge of the paper contacts the
platen absorber and stains the printout.
Uneven density due to sudden release of
trailing edge from roller
Barely perceptible with normal images.
Postcard leading edge curl
Occurs when printing the address side of the
card after borderless printing the other side.
Conspicuous with IJ postcards, but also
occurs with government issue postcards and
KH201 although barely perceptible.
When borderless printing, uneven print
density occurs about 4mm from the trailing
edge.
Occurs with PR101 and the pattern for
checking striping and uneven density. Barely
perceptible with normal images.
When using VIVID Photo, uneven color can
occur in areas of high density
Problem occurs almost solely with solid dark
color, such as images of night sky.
Smudge on the plain paper is worse than that
of the BJC-8200.
The quality in high quality mode (4-pass
printing) is worse than that in standard mode
(2-pass / default settings). (Same problem on
the address side of PH101)
Color deterioration on HG-201
When the HG-201 is left in high temperature
and high humidity environments for a few
minutes, printed colors become subdued in
appearance.
Other:
1) The occurrence rate of the following problems is very low, and they can be recovered by normal cleaning:
* Color mixing (a issue mainly with yellow).
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All The distance between the platen rib surface and the
platen absorber is too narrow for paper curling during
printing. As such, during borderless printing the
trailing edge of the paper may fall into the channel
and come in contact with the absorber.
All Uneven density due to feeding, when the paper is
released by the pinch roller.
All There is friction with the leading edge at the ASF
separation pad when feeding. As such, when the
address side is printed after the reverse has already
been printed the leading edge tends to curl.
All Based on the amount of curling due to printing,
when printing the end of the trailing edge it falls into
the platen channel. If the paper thickness lever is
adjustment, dot placement is affected.
All Possibility that this problem occurs due to digital
camera (etc.) CCD noise.
All Compared with the BJC-8200, when ink is
continuously ejected from the nozzles, the increase
in the amount of ink ejected is large.
All When the new magenta and yellow dye inks,
introduced to improve the color brilliance and light
fastness, are printed on film, the dye migrates easily
in high temperature and high humidity
environments.
ManualsBooks
Have the user understand that although
borderless printing is possible with normal
paper, it is not recommended.
As per specifications.
When there are problems with leading edge
curl, print the address side of the card first.
As per specifications.
If this is a problem, advise against use of
VIVID Photo. (VIVID Photo is default OFF).
Change the print mode to standard, if the
smudge occurs in high quality mode. Use
specialty paper.
Do not stack the printed sheets of HG-201. Put
a sheet of paper between printed HG-201
films for storage.