Canon LBP1760P Service Manual page 43

CHAPTER 2
2. Operation of each block
a. CPU (IC501)
The CPU is a 8-bit 1-chip microprocessor. It is a 1-chip type CPU with built-in ROM and RAM.
According to the control programs stored in the ROM, it controls the following operations of the
printer.
1) Printer sequences
2) Video interface
3) High-voltage power supply circuit
4) Laser/scanner
5) Sensors
6) Loads such as motor, clutch and solenoids
7) Communication with options
b. Reset IC (IC502)
IC502 monitors +3.3V and resets the CPU when the power ON.
c. Regulator (IC503)
IC503 generates +5V from +24V supplied from the low-voltage power supply circuit. This +5V
is supplied to the laser driver and video controller.
d. Fixing heater control circuit/fixing heater safety circuit
See "B. Fixing Control" in this chapter for details.
e. High-voltage power supply circuit
See "C. High-Voltage Power Supply Circuit" in this chapter for details.
f. Low-voltage power supply circuit
See "D. Low-Voltage Power Supply Circuit" in this chapter for details.
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