Canon BJC 6000 - Color Inkjet Printer Service Manual page 112

Part 4: Technical Reference
A/D converter
Detects the following analog signals:
Internal temperature analog signal from the thermistor on the control board.
Head temperature analog signal from the temperature sensors inside the BJ
cartridge.
Ink chamber ink detection analog signal from the ink sensor.
Density detection signal from the print position sensor for printing position
compensation.
I/O Port
Receives the cover sensor signal as input, and sends the lighting signal for the LED
inside the print position sensor as output.
c) DRAM (IC302)
Controlled by the printer controller, the 16Mbit-DRAM is used as a receive buffer,
download buffer, print buffer, and working area.
d) Motor driver IC (IC401)
Drives carriage motor and paper feed motor with steady currents generated
according to the drive current signal data (serial data) it receives from the printer
controller.
e) EEPROM (IC602)
Controlled by printer controller, the 2Kbit EEPROM stores in memory the quantity of
absorbed waste ink, paper feed count, and BJ cartridge mount/demount count. The
contents will be read when the printer is powered on, and written when powered off.
f) Control ROM (IC202)
8Mbit ROM containing the programs for controlling this printer.
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