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Part 4: Technical Reference
2.3 Optimum Printing Direction Control
To prevent vertical misalignment of printed characters, etc., when printing data is
printed continuously in the direction of the paper feeding direction, printing is executed
with the carriage moving in 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.
2.4 Ink Smear Control
Immediately after the printed sheet is ejected from the printer, the ink dries naturally
on the paper output tray. If the next printed sheet is ejected before the ink on the
preceding sheet has enough time to dry on the paper output tray, the ink may be
smeared when the next sheet slides over the preceding one. To prevent this, a wait
period is applied during printing so that sheet ejection is delayed, giving more time for
the ink on the preceding sheet to dry.
When a black BJ cartridge is used (whose printing speed is faster), and high duty
printing is completed, the printer automatically detects the high duty printing position
and the time elapsed from the start of printing.
There is no need to execute ink smear control when a color BJ cartridge is used.
2.5 Head Overheating Protection Control
If the ink has run out and the printing operation is continued, the bubble jet head can
get extremely hot. If the head temperature sensor in the bubble jet head detects a
temperature above the temperature limit, head overheating control is executed.
Protection level 1:
This level prevents the user from touching the bubble jet head's hot aluminum plate
when the bubble jet head is replaced. For this purpose, when the front cover is opened,
the carriage will not move to the cartridge replacement position. Close the front cover,
leave the printer inactive for a few minutes to allow it to cool, and then open the front
cover again to perform the required operation.
Protection level 2:
If a high temperature is still detected, the carriage is returned to the home position for
3.5 seconds to bring down the temperature. After the resting period, printing will
resume. This continues for over 20 seconds' to lower the head's temperature.
Protection level 3:
If the temperature continues to increase, a head temperature error occurs. This stops
the printing operation.
4-8
BJC-2000
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