Canon BJC 6000 - Color Inkjet Printer Service Manual

b) Color/Photo BJ cartridge controlThe Color/Photo BJ cartridge has 144 (48 x 3) nozzles. Each nozzle has two heaterboards in an array, large and small, one in front, the other in the rear. The frontand rear two heaters will be controlled to provide multi-drop driving, with bothdriven simultaneously to discharge a large drop, or with only the small one driven todischarge a small drop. The head's 144 nozzles are divided into 9 blocks (16 nozzlesper block), with all blocks driven simultaneously, with one nozzle per block in theHigh 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 controlsignals. These signals are always fed to the head during printing, using the BlockENABLE signals (BENB 0, 1), Even/Odd ENABLE signal (Even/Odd ENB), and theHeat Select signals (HSEL1A0, 1A1, 1B0, 1B1, 2A0, 2A1, 2B0, 2B1) to select theheaters to turn on. HENB 0 and 2 drive the Photo BJ cartridge's rear heater whileHENB 1 and 3 drive its' front heater. HENB4 drives the Color BJ cartridge's rearheater, 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 tothe monitored head rank and internal temperature, etc., to always ensure optimumink discharge.4-5BJC-6000Part 4: Technical Reference