Canon Color Bubble Jet BJC-1000 Series, Service Manual

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2.2 Printing Modes
2.2.1 Printing mode
Depending on the cartridge installed, the media, the printing mode, the resolution, the
printing data, etc., the printer varies the carriage movement, bubble jet head driving
frequency, etc., to attain high-quality printing without any bleeding or shifting in the
printout.
The smoothing function is available only when using the black BJ cartridge. When
the 720 dpi printing/smoothing feature is used, the carriage feed pitch is set to 1/720
inch. Although this slows down the carriage speed, the bubble jet head’s driving
frequency (heat frequency) is increased so that the overall printing throughput
decreases little.
When monochrome printing is conducted using the color BJ cartridge, composite
black is used as the color. Composite black is made from three colors of Y, M and C,
and it is printed in 66.7% duty of each color, total approximately 200% duty. The
boundary line is printed with 100% duty of each color, total 300% duty. This makes
the black color look darker.
With the photo BJ cartridge installed, this printer prints pixels by dividing the pixel
data into a maximum of 4-values (no printed, print 1 dot, print 2 dots, print 3 dots).
This method enables the printer to achieve high degree gradation printing. When
printing with 2 dots, the second dot is printed in the 720 dpi position. When printing
with 3 dots, the second dot is printed in the 720 dpi position while the third dot is
printed on top of the first dot. When monochrome printing using the photo BJ
cartridge, printing is conducted at a maximum total (C/Y/M) of 400% duty, but the
boundary lines are not emphasized.
The printing method for the respective printing modes are listed below.
Part 4: Technical Reference
4-6
BJC-1000
With a Black BJ Cartridge
Printing Mode
Carriage
Number of Nozzles Heat Frequency [ * ]
Movement
Fine 4 passes 16 nozzles 7.35KHz [7.35KHz]
HQ (Smoothing OFF) 1 pass 64 nozzles 7.35KHz [7.35KHz]
HQ (Smoothing ON) 1 pass 64 nozzles 10.42KHz [5.21KHz]
HS 1 pass 64 nozzles 8.93KHz [8.93KHz]
With a Color BJ Cartridge
Printing Mode
Carriage
Number of Nozzles Heat Frequency [ * ]
Movement
Fine 2 passes 8 nozzles 7.35KHz [7.35KHz]
HQ 1 pass 16 nozzles 7.35KHz [7.35KHz]
HS 1 pass 16 nozzles 8.93KHz [8.93KHz]
With a Photo BJ Cartridge
Printing Mode
Carriage
Number of Nozzles Heat Frequency [
*
]
Movement
Photo 2 passes 8 nozzles 11.4KHz [5.7KHz]
* [ ]: Carriage speed
TABLE 4-1 PRINTING MODES AND HEATING METHODS