Canon S820MG Service Manual page 201

S750/S520 issues
Issue
The volume of operation noise in
Draft mode is high.
When printing the address side of
KH201, multiple sheets are fed
simultaneously in Quiet mode.
Conditions: High temperature, high
humidity only.
In areas of high density, the image is
degraded
A whiteness appears where seams
of color and black printing join
When cancelling a print job, printing
continues even as "Printer not
responding" is displayed.
(Win2000/XP only)
When printing on normal paper in
High quality mode, bleeding of black
ink is even worse than with the S500
model.
Borderless printing on GP301
results in friction with the head.
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Model Cause
S750 The movement of the pressure plate during
normal feeding operation is noisy.
Improvements in speed have increased the
speed of pressure plate operation and related
noise levels.
S750 When the address side of the paper is printed
after having already printed the reverse, the
moisture of that side increases its friction
coefficient with other sheets and they are fed
together.
S750 In order to improve color density, the ink
ejection amount ink has been increased.
S750 Color areas lying next to sections of solid
black ink lower the density of the black ink,
causing this problem.
When the density of black ink on the page is
high, and the time before color ink is printed
next to it is short, this problem is likely to
occur.
Paper type and image are also factors.
S750 Even though the printer receives the cancel
signal, while a job is being cancelled the
status cannot be freed up.
S520 Due to the increase of the color ink ejection
amount.
All (1) Curled paper cannot be depressed
properly by the eject roller.
(2) There is no paper depressor on the left
side of the printer.
ManualsBooks
Countermeasure
(1) Change the print quality setting from Draft
to Standard. The throughput is lowered.
Bk: 20 -> 12 ppm, Cl: 13 -> 8 ppm
(2) Use Quiet mode. Throughput is lowered.
When this problem occurs, switch from Quiet
to Standard mode.
In the driver properties, change the
brightness in the color adjustment settings
from Normal to Light.
(1) Raise the print quality (this increases the
number of passes and lengthens the time
between ejection of color and black inks)
Throughput is lowered.
(2) Use a paper not conducive to bleeding.
None.
None.
When there is friction with the head, move the
paper thickness lever to the envelope
position.
A display will appear indicating that the lever
is not set to the correct position.
The accuracy of dot placement will be
affected, lowering print quality (S750)
Remarks
As to date, ROM version will be
upgraded.
See information for overseas.
Even if paper impacts against
the head, the head will not
suffer damage.