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Part 4: Technical Reference
BJC-6000
b) Color/Photo BJ cartridge control
The Color/Photo BJ cartridge has 144 (48 x 3) nozzles. Each nozzle has two heater
boards in an array, large and small, one in front, the other in the rear. The front
and rear two heaters will be controlled to provide multi-drop driving, with both
driven simultaneously to discharge a large drop, or with only the small one driven to
discharge a small drop. The head's 144 nozzles are divided into 9 blocks (16 nozzles
per block), with all blocks driven simultaneously, with one nozzle per block in the
High Speed/Standard mode (for speed), or 18 nozzles per block in all other cases.
The Heat ENABLE signals (HENB 0, 1, 2, 3) are the heater board's drive control
signals. These signals are always fed to the head during printing, using the Block
ENABLE signals (BENB 0, 1), Even/Odd ENABLE signal (Even/Odd ENB), and the
Heat Select signals (HSEL1A0, 1A1, 1B0, 1B1, 2A0, 2A1, 2B0, 2B1) to select the
heaters to turn on. HENB 0 and 2 drive the Photo BJ cartridge's rear heater while
HENB 1 and 3 drive its' front heater. HENB4 drives the Color BJ cartridge's rear
heater, and HENB 3 drives its' front heater. A Heat ENABLE signal consists of a pre-
pulse and main pulse so that heater drive pulse width can be adjusted according to
the monitored head rank and internal temperature, etc., to always ensure optimum
ink discharge.
4-5
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