Canon BJC 6000 - Color Inkjet Printer Service Manual

5.1.8 Head temperature sensorLocated inside the print head in the BJ cartridge, this sensor detects the headtemperature so that the printer can stop printing when this sensor detects anabnormal temperature rise in the head as a head temperature abnormal error. Thediode sensor output varying with the head temperature is detected as a varyingvoltage, so the incoming analog values are converted into digital values by the built-inA/D converter.5.2 Other Detection FunctionsThis printer features other detection capabilities as follows:5.2.1 Waste ink amount detectionDischarged ink from maintenance jetting to keep the print head in good workingcondition, and sucked ink as a result of cleaning is absorbed into the waste inkabsorber. If more ink has been discharged than can be absorbed into the absorber,the ink may leak inside the printer. This waste ink amount detection function isprovided to prevent ink leakage by estimating the waste ink absorber's capacity toabsorb so that it can detect the ink-full condition. The printer calculates the amountof waste ink discharged by maintenance jetting and cleaning, based on the ink dotcounter reading for the discharged ink, so that when the estimated waste ink volumereaches 95% of the waste ink absorber's capacity, allowing for evaporated ink, a wasteink warning will be issued on power-up. If this condition continues until theestimated waste ink amount reaches 100%, a "Waste Ink Full" error will be issued.5.2.2 BJ cartridge detectionThe detection signals from the index unit, built into the print head heater board,detect the installed BY cartridges. For more, refer toPart 4: 3.2.3 d) Cartridgeidentification (Page 4-24).Part 4: Technical Reference BJC-60004-44