Canon MultiPASS C50 Service Manual page 105

6. ELECTRIC CIRCUIT
6.1 Component Block Diagram
AC230V
+5V +5V
Power supply
unit
+24V
32 MHz
+24V
Regulator
To
(IC403)
PCNT
Board
+12V
Document feed
motor
Driver IC
M
(IC 302)
Printer control
section
Carriage
motor
Driver IC
M
(IC 12)
Paper feed
motor
Driver IC
M
(IC 6)
Pickup roller
sensor
Paper edge
sensor
Temperature
sensor
Home position
sensor
Ink detect
Document sensor
sensor
Pulse
genration
Operation panel unit
circuit
System controller (1/3)
(IC401)
Address/Data Bus AD0 to AD7
Address Bus A0 to A23
System controller (2/3)
(IC401)
Bi-Centronics
interface
20MHz
EEP ROM
(IC8)
Data Bus D0 to D15
Printer
controller
Address Bus A0 to A23
(IC5)
ROM DRAM 4M bit
8M bit
(IC4)
(IC3) Heater Heater
driver driver
Sub-
BJ head
heater
Cartridge detection
Figure 2-19 Block Diagram
2-25
Chapter 2: Technical Reference
Document
edge sensor
System control section
Real-time
clock IC
Serial transmission
(IC203)
Data backup
Reset IC
(IC202)
System controller
Color
(3/3) (IC401)
Image
Processing IC
UHQ
(IC 902)
function
SRAM SRAM SRAM
256k bit 256k bit 256k bit
(IC 402) (IC 406) (IC 901)
Document
scanning
section
LED
Color
Contact sensor
Modem IC
R144EFXL
(IC701)
Communication
control section
AMP.
+24V
From PCNT
Board
Speaker
NCU board