Canon LASER CLASS 730i, Service Manual

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LASER CLASS 730i/720i/710 Chapter 2: Technical Reference
2-2
The following six printed circuit boards are located in this machine:
1.SCNT board that controls the entire system
• Operation panel control
• Scanner control
• Printer interface control
• Communications unit control
• Speaker control
• Sensor detection
• Memory functions
• Energy Saver control
2.NCU board that interfaces with the telephone line
• Hybrid circuit
• Line voltage conversion circuit
3.MODULAR board that connects the telephone line and the NCU board
• Line interface
4.ECU board used to control the operation of the laser scanner, motor, and
solenoid as well as pickup from the 2nd/3rd cassette.
• Fixing heater control
• High voltage control
• Drive control
• Sensors detection
• Laser control
• Scanner motor control
5.EPU board on which the fixing heater control circuit and the high-voltage
power supply circuit are mounted.
6.OPCNT board that controls the operation panel’s buttons and LCD
• Buttons detection and LED drive function
• Display
• Serial communication
• Sensors
7.A Power supply unit is also located in this machine
• Switching regulator
8.Sensor board used to monitor the sensors in the reader unit.
• Sensors
9.G3 FAX board (Dual-line option) used to control the circuit communications
block.
• Dual-line communications unit control
10.NCU board that interfaces with the telephone line (Dual-line option)
• Hybrid circuit
• Line voltage conversion circuit
11.MODULAR board that connects the telephone line and the NCU board
(Dual-line option)
• Line interface