Canon BJC 50 Service Manual - Page 104

Part 4: Technical Reference BJC-50 2.3 Printing Modes Depending on the cartridge installed, the medium, the printing mode, the resolution, the print 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. When the 720 dpi printing/smoothing feature is used, the carriage feed pitch is set to1/720 inch. Although this slows down the carriage speed, the bubble jet head drive frequency (heat frequency) is increased so that the overall printing throughput decreases. During color printing at a single pass, the different colors printed at the same time overlap, often causing the colors to run. By printing with three passes, color bleeding is less prone to occur since the color printed immediately before is stable by the time the next color is printed over it. When print data is processed internally by the printer, the data is recognized and the number of ink nozzles to be used by the black ink is change automatically. The printing method for the respective printing modes are listed below. TABLE 4-1 PRINTING MODES AND HEATING METHODS With a Black BJ Cartridge Printing Mode Bk-HS Bk-HQ Bk-FINE Bk-Smoothing Bk-HQ (720) Bk-FINE (720) Carriage Movement 1 pass 1 pass 4 passes 1 pass 1 pass 4 passes Number of Nozzles 128 nozzles 128 nozzles 32 nozzles 128 nozzles 128 nozzles 32 nozzles Resolution [dpi] 180 360 360 360 720 720 Carriage Speed Heat Frequency [kHz] [kHz] 7.82 7.82 6.43 6.43 6.43 6.43 3.91 7.82 6.43 12.86 6.43 12.86 With a Color BJ Cartridge Printing Mode Bk & White-HS Bk & White-HQ Bk & White-FINE Color-HS Color-HQ Color-FINE Color-HQ (720) Color-FINE (720) Carriage Movement 1 pass 1 pass 4 passes 1 pass 1 pass 3 passes 1 passes 3 passes Number of Nozzles 64 nozzles 64 nozzles 16 nozzles 24 nozzles 24 nozzles 8 nozzles 24 nozzles 8 nozzles Resolution [dpi] 180 360 360 180 360 360 720 720 Carriage Speed Heat Frequency [kHz] [kHz] 7.82 7.82 6.43 6.43 6.43 6.43 7.82 7.82 6.43 6.43 6.43 6.43 4.73 9.46 6.43 12.83 * When the print resolution is 720 dpi, print data is not thinned. * When the print resolution is 720 dpi, processing to prevent colors running at the borders is not executed. 4-16