Canon PIXMA MP170, Service Manual

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if any of the C/M/Y inks is heavily consumed, the margin of error for remaining ink increases.
ii) When performing continuous BK solid printing (BK ink detection error margin):
With continuous printing, ink flow from the tank to the ink chamber can be interrupted, after which
ink remains unused in the tank.
<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 CMY colors of ink or continuous solid printing, etc.). (See "Accuracy" above.)
(4) 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. As it is not necessary to perform print head alignment at
setup or installation of the machine, the function is only briefly introduced at installation.
2 types of print head alignment, the manual alignment using the MP driver and the automatic alignment using the
print head alignment sheet, are available.
<Print head alignment>
A: Alignment of cyan nozzle inclination
B: Alignment of cyan large nozzles in bi-directional printing
C: Alignment of cyan small nozzles in bi-directional printing
D: Alignment between cyan large and small nozzles
E: Alignment o magenta large nozzles in bi-directional printing
F: Alignment of magenta small nozzles in bi-directional printing
G: Alignment between magenta large and small nozzles
H: Alignment between black even and odd nozzles
I: Alignment of black nozzle inclination
J: Alignment of black nozzles in bi-directional printing
K: Horizontal alignment between CL and BK chips
L: Vertical alignment between CL and BK chips
M: Alignment of yellow large nozzles in bi-directional printing
N: Alignment of yellow small nozzles in bi-directional printing
O: Alignment between yellow large and small nozzles
<Problems that can be resolved by this function>
Try the print head alignment for the following problems:
- The line is not straight.
- Printout is granulated.
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