Canon W8400 Series, Service Manual, Page: 56 / 224

Chapter 2
2-6
F-2-6
2.2.3 Print Control
0009-1501
1. Print mode
This printer is capable of fast, high-quality printing without blurring or inconsistent ink density by changing the carriage operation, sheet feeding operation,
and other printing methods according to the selected paper, print quality, and print data.
Printing is performed for each color using multiple passes. This enables reduction of concentration irregularities caused by the range of discharge amounts
for each nozzle, and the print timing is shifted so that the printed ink is virtually fixed before the next ink layer is applied in order to minimized bleeding.
The printer supports a maximum of 16-pass printing according to the required print quality.
a) Draft mode
In the high-speed (draft) print mode, the image data is thinned out and a single band (equivalent to the width of a nozzle array) is printed in a 2-pass, 4-
pass or 8-pass operation.
This mode is used by selecting the "Draft" option under Print Quality settings in the printer driver.
The printer operation in high-speed mode depends on the printer driver sheet setting. When printing in 2-pass bi-directional format, the image data is
divided into two parts for each color under nozzle block control.
When printing in 4-pass bi-directional format, the mask pattern control divides the image data into two parts for each color, and then nozzle block control
is used to further divide this data into two parts.
When printing in 8-pass bi-directional format, the mask pattern control divides the image data into four parts for each color, and then nozzle block control
is used to further divide this data into two parts for printing.
b) Standard mode
In normal print mode, a single band (equivalent to the width of a nozzle array) is printed in 6-pass or 8-pass operation.
This mode is used by selecting the "Standard" option under Print Quality settings in the printer driver.
The printer operation in standard mode depends on the printer driver sheet setting. When printing in 6-pass bi-directional format, the image data is divided
into three parts for each color under mask pattern control and then nozzle block control is used to further divide this data into two parts for printing.
When printing in 8-pass bi-directional format, the mask pattern control divides the image data into four parts for each color, and then nozzle block control
is used to further divide this data into two parts for printing.
c) High mode
In high quality print mode, a single band is printed using 8-pass or 16-pass operation.
This mode is used by selecting the "High" option under Print Quality settings in the printer driver.
The printer operation in high-speed mode depends on the printer driver sheet setting. When printing in 8-pass bi-directional format, the image data is
divided into four parts for each color under mask pattern control and then nozzle block control is used to further divide this data into two parts for printing.
When printing in 16-pass bi-directional format, the mask pattern control divides the image data into eight parts for each color, and then nozzle block control
is used to further divide this data into two parts for printing.
d) Highest mode
In super-high quality print mode, a single band is printed using an 16-pass operation.
This mode is used by selecting the "Highest" Fine option under Print Quality settings in the printer driver.
The mask pattern control divides the image data into eight parts for each color, and then nozzle block control is used to divide this data into two parts for
16-pass bi-directional printing.
Print modes
"Shut Down.." is
shown on display
Media detection
Cut sheet
Roll media
Engine controller data
backup
* Writing to EEPROM
System controller data
backup
* Writing to EEPROM
Power off
Power button OFF
* Hold down for at least 1 second
Discharge operation
Upper cover / Right
cover lock release
Uppercover / Right
cover lock