Canon iPF760 series Service Manual

Also see for iPF750 series: Service manual Service manual

Contents

Chapter 22-43Even when the printer is turned off, the timer function is held on using the RTC(IC803) and lithium battery(BATS801) to assist the cleaning function.When the power cord is plugged to the outlet, power is supplied to the RTC and therefore the lithium battery power is not consumed.Heat Enable signal control functionThis function uses the pulse width to perform variable control of the time of application of the Heat Enable signal to the nozzle heater board for each printheadnozzle array.Linear scale count functionThis function reads the linear scale when the carriage moves, thus generating the ink discharge timing. It also counts the linear scale timing cycle using the referenceclock to measure the carriage moving speed.Dot count functionThis function controls the discharge dots used as the information for Heat Enable signal control, maintenance jet control, cleaning control, and remaining ink levelfor each nozzle array.Operation panel control functionThis function controls serial communication with the operation panel.PWM control functionThis function controls driving of the suction fan and mist fan as well as the temperature of the printhead.Remaining ink level detection functionThis 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 functionThis function controls the LEDs on the ink tank unit.I/O port functionThis function controls input signals from sensors.Power ON/OFF control functionThis function controls turning on/off of the drive power (26 V and 21.5 V) supplied from the power supply PCB.Head DI sensor read control functionThis function controls read operation by the head DI sensor.Multi sensor control functionThis function controls the LED, adjusts the gain, and controls obtainment of the reading for the multi sensor.EEPROM control functionThis function controls the EEPROMs of individual ink tanks, the maintenance cartridge EEPROM, the EEPROM on the maintenance cartridge relay PCB, and thehead EEPROM in addition to the on-board EEPROM.Motor control functionThis 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 inputsignals from sensors.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 tobe 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 PCBproperly (the service mode will be switched to the PCB replacement mode automatically).2.4.2.3 HDD expansion PCB components 0023-2545iPF765 / iPF755