3) Description of block diagram
Block enable decoder *
1
Generates BLOCK1 to 6 according to BE0 to 2 from the logic board.
The output sequence of BLOCK1 to 6 is inverted according to whether INV is High or Low.
310-/240-bit shift register
Converts IDATA *1 from the logic board into parallel print data for output.
310-/240-bit latch
Latches and outputs the parallel print data using the LTCLK timing.
AND gate *
1
Outputs the part of the parallel print data specified by BLOCK1 to 6, EVENE, and ODDE.
310-/240-bit transistor array *
1
Turns on the heaters according to the print data from the AND gate.
The heaters, which are pulled up to VH, are turned ON by setting the heater
connection Low.
Heaters 1 to 310, or 1 to 240
The heater temperature rises when turned on to pre-heat and main-heats the nozzles.
The heaters are aligned with the nozzle array against the nozzles in the head holder.
Rank resistance
Differences in the heater characteristics of the various BJ heads are ranked and
marked using their resistance, which is detected by the printer. The resistance is read
by the A/D board of the MPU as a voltage and converted to digital format to detect the
rank, allowing the BJ print heads to be controlled for optimum print quality.
Sub-heater
This heater adjusts the temperature of the heater board to stabilize the ejection of inks.
The printer drives the sub-heater according to the temperatures detected by the
head temperature sensor and printer temperature sensor, which is mounted on the
carriage board, and the print mode, etc.
Head temperature sensor
The head temperature sensor outputs the temperature of the heater board to the printer.
The voltage output by the head temperature sensor is read by the A/D board of the
MPU as a voltage and converted to digital format to detect the temperature. The
print quality is controlled and the head prevented from overheating on the basis of
the detected temperature.
Electrode *
2
The ink-out detection pulse is output to the ink room on the head holder to detect
ink-outs in the ink-path.
Index *
2
The type of BJ cartridge mounted in the printer is output to the printer.
*1: The connection and order of IDATA differs according to the type of BJ cartridge.
*2: Some of the electrodes of the color and photo heads are connected to contacts
that are shared with the index.
Part 4: Technical Reference
BJC-7100
4-26
Содержание BJC-7100
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