Faq (Problems Specific To The Mp950 And Corrective Actions) - Canon PIXMA MP950 Service Manual

5. FAQ (Problems Specific to the MP950 and Corrective Actions)

No. * Function Phenomenon
Skewed paper
feeding
1 B Print results
Improper paper
feeding:
- Multi-feeding
- Skewed paper
feeding
- Paper jam
2 B Paper feed
Skewed paper
feeding (at the level
of +/- 1%)
3 C Print results
Soiling on the back
side of paper (lines
or streaks parallel to
the paper feed
direction)
4 A Print results
Soiling on paper in
automatic duplex
printing (lines or
streaks
perpendicular to the
paper feed
direction)
5 B Print results
Scratches on paper
Condition
- Paper feeding from the
cassette, Photo Paper Plus
Double Sided, 5 x 7 size
- Paper feeding from the ASF
- Plain paper
- Highest print speed (Custom
setting to 5)
- In the high temperature and
high humidity environment
- In the low temperature and
low humidity environment
- With the maximum amount
of paper set (13 mm)
- Paper feeding from the ASF
- Credit Card size
- After continuous borderless
printing of small sized paper
(such as 4 x 6), when a larger
sized paper (such as A4) is
printed.
- With Photo Paper Plus
Double Sided or postcards,
the phenomenon is likely to
be noticeable and to be
complained of by users, as
printing is performed on both
sides of such paper.
- Automatic duplex printing
(Photo Paper Plus Double
Sided, postcards, plain
paper)
- PP-101D, PP-101, PR-101,
SG-101, etc.
2-9
Cause
Due to its mechanism, Change the paper feeding
contact of the PF pinch method from the cassette to
rollers to the 5 x 7 size the auto sheet feeder.
paper is uneven, which is
likely to cause skewed
paper feeding.
In the high temperature - Reduce the amount of
and high humidity paper set in the ASF to
environment, paper
half (approx. 5 mm high).
becomes wavy; in the low
temperature and low
humidity environment,
paper curls significantly.
When the maximum
amount of paper is set in
the ASF, and if the paper-
return tab fits in a wave or
curl of the paper, the tab
slips and does not catch
paper properly, causing
paper feed problems.
Since coaxial tolerance - Align the paper guide to
between the pinch roller the paper edge tighter
and the LF roller, which than usual.
determines the paper feed
alignment, is 0.2mm,
skewed paper feeding can
occur. However, according
to the field data of current
models, the skewness level
caused by the coaxial
tolerance of 0.2mm is
within the criteria of +/-
1%, thus the phenomenon
is left as is.
In borderless printing, 1. Perform Bottom plate
printing is performed to the
size slightly larger than the
paper size, and ink off the
paper is absorbed by the
platen's ink absorber.
2. If soiling on the paper
Absorbed ink may attach
to the platen rib(s) after
several dozen sheets are
printed, causing soiling at
the leading edge of paper
or on the back side of
paper.
On the rib(s) inside the
Temporary operational
sheet feed unit used for solution:
duplex printing, ink mist
Cancel automatic duplex
may accumulate, smearing
printing, and manually print
paper.
each side of paper.
Cleaning by user:
1. Perform Bottom plate
2. If soiling on the paper
If the phenomenon persists
after conducting 1 and 2,
servicing is required.
Service:
Wipe any soiling or dirt off
from the sheet feed unit and
the bottom case unit ribs
Scratches on the PF return - Change the paper feeding
lever due to paper feeding method from the cassette
Possible call or
Corrective action
complaint
- Paper feeds at an
angle.
- A margin appears on
printouts.
- Multiple sheets of
paper feed at the
same time.
- Paper feeds at an
angle.
- A paper jam occurs.
- Paper feeds at an
angle.
- A margin appears on
printouts.
- Paper gets smeared.
cleaning (from the MP
- The back side of
driver or via the
paper gets smeared.
operation panel) up to 3
*1
times .
still remains after
Bottom plate cleaning,
wipe the platen rib(s)
and their surroundings
with a cotton swab.
- Paper gets smeared.
- The back side of
paper gets smeared.
- Even after Bottom
plate cleaning was
performed, and the
platen ribs were
cleaned with cotton
swab, paper gets
cleaning (from the MP
smeared.
driver or via the
operation panel) up to 3
*1
times .
still remains after 3
times of Bottom plate
cleaning, wipe the
platen rib(s) and their
surroundings with a
cotton swab.
*2
.
- Paper is scratched.
- Marks appear on