Canon iPF750 series Service Manual Download

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Chapter 2

2-42

Motor control function

This function controls the carriage motor, feed motor, valve motor (L)/(R), shutter motor, purge motor, lift motor, roll motor and cutter motor based on the input
signals from sensors.

HDD control function

This function controls the hard disk drive.

b) Driver IC (IC4101/4103)

This IC generates a carriage motor control signal based on the control signal from the ASIC.

c) Driver IC (IC4200)

This IC generates a feed motor control signal based on the control signal from the ASIC.

d) Driver IC (IC4300)

This IC generates purge motor and cutter motor control signals based on the control signal from the ASIC.

e) Driver IC (IC4401)

This IC generates roll motor and valve motor (L)/(R) control signals based on the control signal from the ASIC.

f) Driver IC (IC2750)

This IC generates a shutter motor control signal based on the control signal from the ASIC.

g) Driver IC (IC3001)

This IC generates a lift motor control signal based on the control signal from the ASIC.

h) DIMMs (IC301, IC302, IC601, IC602, IC603, IC604)

The DIMM comprising a 512-MB DDR-SDRAM (IC301/IC302) and 256-MB SDR-SDRAM (IC601/IC602/IC603/IC604) is connected to the 32-bit data bus to
be used as a work area.
During print data reception, it is also used as an image buffer.
It cannot be expanded.

i) FLASH ROM (IC701/IC703)

A 128-MB/64-MB flash ROM (IC701/IC703) is connected to the 8-bit data bus to store the printer control program.

j) EEPROM (IC802)

The 256-KB EEPROM stores various setting values, adjustment values, log data, counter values related to the user/servicing.

MEMO:

After replacement of the main controller PCB, the printer must be started up in the service mode to copy over the setting and adjustment values to the new PCB
properly (the service mode will be switched to the PCB replacement mode automatically).

2.4.2.2 Main controller PCB components

0023-2542

iPF760 / iPF750

F-2-33

a) ASIC (IC1/IC2)

The ASIC (IC1/IC2) with a 32/16-bit internal bus is driven in sync with the 165/66 MHz external clock. It supports the following functions:

Image processing unit

This unit converts the RGB multi-value image data or CMYK multi-value data received from the host computer through the interface connector to the binary image
data for the ink colors used.

DMA controller

This controller control DMA transfer of the data transferred through the input interfaces as well as DMA transfer of the data 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 FLASH ROM,
and stored the generated image data in DIMM. It also outputs the generated image data to the carriage 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

IC4101

IC4200

IC4103

IC4300

IC4401

IC2750

IC2

IC1

IC301