Canon iPF9000 series, Service Manual

Page: 158 / 432

Chapter 2
2-50
2.4.2 Main Controller
2.4.2.1 Main controller PCB components
0014-2331
iPF9000
F-2-30
a) ASIC(IC1,IC2)
The ASIC(IC1/IC2) with a 32/16-bit internal bus is driven in sync with the 132/66 MHz external clock. It supports the following functions:
Image processing unit
This unit converts the RGB multi-bit image data or CMYK multi-bit data received from the host computer through the interface connector to the binary image data
for the ink colors used.
DMA controller
This controller controls the input interfaces such as the USB and expansion card slot as well as DMA transfer of the data to be stored in the DIMM.
Image data generation/output function
This function generates image data for color printing from the received image data and the mask pattern (corresponding to print mode) stored in the DIMM, and
store the generated image data in another DIMM. It also outputs the generated image data to the carriage relay PCB.
Interrupt controller
This controller receives and processes internal interrupts and external interrupts from the USB, image processing unit, and expansion card slot.
Timer function
Even when the printer is turned off, the timer function is held on using the RTC and secondary lithium battery to assist the cleaning function.
When the power cord is plugged to the outlet, power is supplied to the RTC and therefore the secondary lithium battery power is not consumed.
Heat Enable signal control function
This function uses the pulse width to perform variable control of the time of application of the Heat Enable signal to the nozzle heater for each nozzle array (PWM
control).
Linear scale count function
This function reads the linear scale when the carriage moves, thus generating the ink jet timing. It also counts the linear scale timing cycle using the reference clock
to measure the carriage moving speed.
Dot count function
This function counts the fired dots used as the information for Heat Enable signal control, maintenance jet control, cleaning control, and remaining ink level for
each nozzle array.
Operation panel control function
This function controls serial communication with the operation panel.
PWM control function
This function controls driving of the suction fan and mist fan as well as the temperature of the printhead.
Remaining ink level detection function
This function detects the remaining level of each color of ink based on the signal received from the hollow needle mounted in the ink tank unit.
LED control function
This function controls the LEDs on the ink tank unit.
I/O port function
This function controls input signals from sensors.
Power ON/OFF control function
This function controls turning on/off of the drive power (32V and 5.1V) supplied from the power supply PCB.
Head DI sensor read control function
This function controls read operation by the head DI sensor.
Multi sensor control function
This function controls the LED, gain adjustment, and controls obtainment of the reading of the multi sensor.
EEPROM control function
This function controls the EEPROMs of individual ink tanks, the maintenance cartridge EEPROM, the EEPROM on the maintenance cartridge relay PCB, and the
head EEPROM in addition to the on-board EEPROM.
Motor control function
This function controls the carriage motor, feed motor, valve motor, purge motor, lift motor based on the input signals from sensors.
b) Driver IC (IC3100)
This IC generates a carriage motor control signal based on the control signal from the ASIC.
c) Driver IC (IC2802)
This IC generates feed motor control signal based on the control signal from the ASIC.
IC604
IC603
IC602
IC601
IC2 IC701 IC3100 IC802
IC2900
IC2802
IC3203
IC1201
IC3900
IC1