Canon PIXMA iP6220D Service Manual page 33

<Accuracy>
- The margin of error of detection accuracy is +/-10% in normal printing.
- The margin of error is likely to be large in the following specific print patterns:
When printing continuously using any one of the Photo /CL three colors of ink:
As the remaining ink level is calculated by the counted dot value of the least remaining ink of
Photo/Cl three colors, if any of the C/M/Y inks is heavily consumed, the margin of error for remaining
ink increases.
<Possible problems with this function>
1) When a one-used ink cartridge is installed, the actual remaining ink level is not detected, and an error indicating
the remaining ink amount is unknown occurs.
=> Pressing the OK button will clear the error, and printing can be done. However, the function to detect the
remaining ink amount is disabled (ink status i not displayed).
e.g. An ink cartridge was once used in another machine.
A current ink cartridge is removed from the machine. -> A new ink cartridge is installed. -> The removed
ink cartridge is installed again after removing the new ink cartridge.
2) Due to the specific print pattern, the actual remaining ink level does not match the indicated remaining ink level.
- This is because a detection error can be large in specific print patterns (such as continuous printing using any
one of the Photo/CL three colors of ink or continuous solid printing, etc.). (See "Accuracy" above.)
(5) Print head alignment
The machine has a print head alignment function to correct displacements between the nozzle lines of the print
head, and incorrect print position in bi-directional printing.
<Print head alignment>
A: Alignment of photo black nozzles in bi-directional printing
B: Alignment of cyan nozzles in bi-directional printing
C: Alignment of magenta nozzles in bi-directional printing
D: Alignment yellow nozzles in bi-directional printing
E: Alignment of photo black small nozzles in bi-directional printing
F: Alignment of cyan small nozzles in bi-directional printing
G: Alignment of magenta small nozzles in bi-directional printing
H: Alignment of yellow small nozzles in bi-directional printing
I: Alignment of photo cyan nozzles in bi-directional printing
J: Alignment of photo magenta nozzles in bi-directional printing
K: Alignment of photo cyan small nozzles in bi-directional printing
L: Alignment of photo magenta small nozzles in bi-directional printing
O: Horizontal alignment between chips
P: Vertical alignment between chips
W: Alignment of color nozzles small inclination
X: Alignment of black nozzles inclination
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