Canon BJC-55 Series, Сервисный бюллетень

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2.4 Optimum Printing Direction Control
To prevent vertical misalignment of the printed characters, etc., when print data is
printed continuously in the direction of the paper feeding direction, printing is executed
with the carriage moving from only one direction.
However, when printing in the paper feed direction is not continuous, since vertical
misalignment is not so noticeable, the printing direction is alternated so that printing is
also executed from the opposite carriage direction. This improves the throughput.
If four or more successive null rasters are detected in the lower (in the direction of
paper ejection) 64 nozzles (24 nozzles with a color BJ cartridge) for the print data in the
printer buffer during single-pass printing, printing is executed up to the null raster.
From the null raster onward, printing is executed from the opposite carriage direction.
From the next raster onward, printing is executed from the same carriage direction
until the direction changes again.
2.5 Automatic Emulation Switching
The printer analyzes the control command received from the host computer and
determines whether it is in BJ or LQ mode. The emulation mode is thereby switched
automatically. The BJ setup utility program can be used to turn on or off the
automatic switching of the emulation mode.
Control command recognition
By recognizing the control command received from the host computer, the printer can
determine which emulation mode to set. The printer determines the emulation mode
when the control command is received at any of the following times:
After the power is turned on and no print data has been received, when no print data
has been received for over 10 seconds, or when the printer has no print data.
Switching the emulation mode
The emulation mode is switched automatically at any of the following times:
When the printer has received over 512 bytes of data, when the data reception (even for
data less than 512 bytes) has been interrupted for over 3 seconds, or when the power
has been turned off before over 512 bytes of data is received or before over 3 seconds of
data reception.
Upon shipment from the factory or when the EEPROM is reset, it is set as
"Invalid".
Immediately after being "Valid", the emulation mode that was set
immediately before will be valid.
There are control commands with which the printer cannot determine the
emulation mode to set. If the emulation mode set automatically is not the
correct one, use the BJ setup utility program or the manual default setting
to cancel the automatic switching of the emulation mode and set the
emulation mode manually.
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BJC-50
Part 4: Technical Reference