Canon i-SENSYS D450d, Service Manual, Page: 113 / 182

Chapter 9
9-1
9.1 Control Panel
9.1.1 Outline
0020-2722
i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn
The machine's control panel consists of the following PCBs, and is controlled by the SCNT PCB.
F-9-1
9.2 Power Supply
9.2.1 Power Supply
9.2.1.1 Power Supply Route
0020-2897
i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn
F-9-2
9.2.2 Protection Function
9.2.2.1 Protecting Function
0020-2723
i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn
In the case of troubles with power supply PCB such as short circuit to loads, and resulted in occurring overcurrent or over overvoltage, there is a protecting function
for overcurrent/overvoltage to automatically shut the output voltage to avoid fault of power supply PCB.
In the case that the protecting function for overcurrent/overvoltage is activated, it recovers by turning off the main power switch to handle the load trouble, and
then, turning on the main switch again. Also, there are 2 pc of fuses in PCB. If there is overcurrent in AC line, fuse is blown out and power distribution is shutdown.
ASIC
LED
LCD
Key SW
SCNT PCB Operation panel
Fixing Assenmbly
High Voltage
Circuit
Motor
Driver
Motor
Driver
NCU
Hook Detection
CI Detection
Speaker
Driver
DC/DCNT
AC Entry
Heater
Control
Heater
Cartridge
HVT
PSU
FET
LED
LDO
LAN
CPU
SDRAM
FLASH
MODEM
SCNT
LCD
Panel
DCNT
DC/DC
CIS
+24V
Main
Motor
Scanner
Motor
LASER
Solenoid
Speaker
BD
CPU
Read
Motor
+24V +5V
+5V
+5V
+3.3V
+3.3V
+3.3V
+3.3V
+1.8V
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
+5V
+5V
+5V
+3.3V
+24V
+24V
+24V
+24V
+24V
+3.3V
+5V
+24V
+24V
+24V