Canon S820MG, Service Manual

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S750/S520 issues
Issue Model Cause Countermeasure Remarks
The volume of operation noise in
Draft mode is high. 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. (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 printing the address side of
KH201, multiple sheets are fed
simultaneously in Quiet mode.
Conditions: High temperature, high
humidity only. 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. When this problem occurs, switch from Quiet
to Standard mode.
In areas of high density, the image is
degraded S750 In order to improve color density, the ink
ejection amount ink has been increased. In the driver properties, change the
brightness in the color adjustment settings
from Normal to Light.
A whiteness appears where seams
of color and black printing join 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. (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.
When cancelling a print job, printing
continues even as “Printer not
responding” is displayed.
(Win2000/XP only) S750 Even though the printer receives the cancel
signal, while a job is being cancelled the
status cannot be freed up. None. As to date, ROM version will be
upgraded.
When printing on normal paper in
High quality mode, bleeding of black
ink is even worse than with the S500
model. S520 Due to the increase of the color ink ejection
amount. None. See information for overseas.
Borderless printing on GP301
results in friction with the head. 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. 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) Even if paper impacts against
the head, the head will not
suffer damage.