Canon BJC 6000 Service Manual - Page 96
This printer uses 5 signals, HCLOCK Pin 13, HDATA Pin 9, HRSTX, d Cartridge identification
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Part 4: Technical Reference BJC-6000 d) Cartridge identification This printer uses 5 signals, HCLOCK (Pin 13), HDATA (Pin 9), HLAT (Pin 19), HRSTX (Pin 29), and DIR (Pin 28) to communicate serially with the bubble jet head to identify the installed BJ cartridge and the head rank. Bubble jet head heater characteristics are classified into 24 types according to the variations associated with the manufacturing process. The printer compensates for these variations to provide optimum control of ink discharge. Switching the printer on with either an unrecognizable BJ cartridge installed, or with one BJ cartridge not installed, will cause the carriage to move automatically to the cartridge replacement position. Also, removing a BJ cartridge when the carriage is not in the cartridge replacement position while the printer is switched on will result in a NO BJ CARTRIDGE error. 4-24