Canon BJC-55 Service Bulletin

Also see for BJC-55 Series: Service manual User manual Start here User manual Specification

2.3 Printing ModesDepending on the cartridge installed, the medium, the printing mode, the resolution,the print data, etc., the printer varies the carriage movement, bubble jet head drivingfrequency, etc., to attain high-quality printing without any bleeding or shifting in theprintout. When the 720 dpi printing/smoothing feature is used, the carriage feed pitchis set to1/720 inch. Although this slows down the carriage speed, the bubble jet headdrive frequency (heat frequency) is increased so that the overall printing throughputdecreases.During color printing at a single pass, the different colors printed at the same timeoverlap, often causing the colors to run. By printing with three passes, color bleedingis less prone to occur since the color printed immediately before is stable by the timethe 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 ischange automatically.The printing method for the respective printing modes are listed below.* 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 theborders is not executed.Part 4: Technical Reference BJC-504-16TABLE 4-1 PRINTING MODES AND HEATING METHODSWith a Black BJ CartridgePrinting ModeBk-HSBk-HQBk-FINEBk-SmoothingBk-HQ (720)Bk-FINE (720)CarriageMovement1 pass1 pass4 passes1 pass1 pass4 passesNumber ofNozzles128 nozzles128 nozzles32 nozzles128 nozzles128 nozzles32 nozzlesResolution[dpi]180360360360720720Heat Frequency[kHz]7.826.436.437.8212.8612.86Carriage Speed[kHz]7.826.436.433.916.436.43With a Color BJ CartridgePrinting ModeBk & White-HSBk & White-HQBk & White-FINEColor-HSColor-HQColor-FINEColor-HQ (720)Color-FINE (720)CarriageMovement1 pass1 pass4 passes1 pass1 pass3 passes1 passes3 passesNumber ofNozzles64 nozzles64 nozzles16 nozzles24 nozzles24 nozzles8 nozzles24 nozzles8 nozzlesResolution[dpi]180360360180360360720720Heat Frequency[kHz]7.826.436.437.826.436.439.4612.83Carriage Speed[kHz]7.826.436.437.826.436.434.736.43