Service manual

BJC-4300

Part 4: Technical Reference

2.4 Optimum Printing Direction Control

To prevent vertical misalignment of the printed characters, etc., when printing 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 prtnter analyzes the control command received from the host computer and

determines whether it is BJ or

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 5 12 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 5 12 bytes of data is received or before over 3 seconds of

data reception.

NOTE

Upon shipment from the factory or when the EEPROM is reset, it is set as

“Invalid”. Immediately after is set to “Valid”, the emulation mode that was

set immediately before well 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

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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