Canon Laser Shot LBP-5100, Service Manual

Page: 71 / 162

Chapter 2
2-37
F-2-40
2.8.2.2 Operation of Individual Blocks
0010-6172
LBP5000 / LBP5100
a. CPU(IC7)
The CPU is a 16-bit single chip microcomputer.
The CPU is a one-chip CPU with built-in ROM and RAM. The machine controls the following printer operation in keeping with the control programs stored in
ROM:
1) printer engine sequence control
2) ASIC control
3) fixing control circuit control
4) fixing assembly control
5) pickup motor, fixing/delivery motor control
6) fan motor control
7) control of various solenoids
8) control of various sensors/switches
9) control of accessories
b. ASIC (IC8)
The ASIC (application-specific IC) is used for IC, memory, and external device interfaces, and is used to control the following printer operations in keeping with
the instructions from the CPU:
1) control of laser/scanner block
2) communication with video control
3) control of high-voltage power supply PCB
4) control of main motor
DC controller PCB
Cassette paper sensor
Video controller PCB
+3.3V
+5V
+24V
Pick-up motor
Laser/Scanner unit
Memory controller
Fixing/Delivery motor
Main motor
Option
M
M
M
+2.5V
SL
SL
SL
Primary charging roller
Developing cylinder
Photosensitive drum
Memory tag
High-voltage power supply PCB
Transfer roller
ETB unit
EP cartridge
Scanner motor
Laser driver
Fan
IC8
ASIC
IC7
CPU
Fixing unit
Manual feed slot paper sensor
Registration paper sensor
Pre-fixing paper sensor
Fixing delivery paper sensor
Pressure alienation sensor
Color misregistration sensor
Environment sensor
Pick-up solenoid
Bk developing cylinder
drive solenoid
Color misregistration
/Density sensor
MCY developing cylinder
drive solenoid
Paper width sensor
Low-voltage
power supply
circuit
AC input
Door open
detection switch
Low-voltage power
supply unit
Fixing control
circuit
IC6
Reset IC
IC5
EEP-ROM
SW