Canon ImageRUNNER 1022iF, Service Manual, Page: 138 / 270

Chapter 9
9-2
9.3 Power Supply System
9.3.1 Power Supply
9.3.1.1 Outline
0013-1188
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
When the main power switch (SW1) is turned on, AC power is supplied to the low-voltage power supply circuit in the power supply PCB.
The low-voltage power supply circuit su3.3 V, +5 V, and +24 V to operate the machine.
+24 V is supplied to the motors, fan, electromagnetic clutch, solenoid, etc. +5 V and +3.3 V are supplied to the DC controller PCB, image processor PCB, anlog
processor PCB.
There are two types of +24 V voltages: +24 VR which is normaly supplied from the low voltage power supply and +24 VU which is cut off when the left door is
opened. The +24VU is supplied to the DC controller PCB and main motor. The +24 VU also plays the role of a door open detection signal (DOPEN). This signal
allows the CPU to detect that the left door has opened.
T-9-1
F-9-3
9.3.1.2 Rated Output of the Power Supply PCB
0013-1189
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
T-9-2
Part Name Function
Power supply PCB Generates DC power from AC power.
Main power switch (SW1) Supplies AC power to the power supply PCB.
Interlock switch (SW2/SW3) Detects opening/closing of the left door and front cover, and cuts
off +24 VR.
Output 24VR 5V 5VR 3.3V 3.3VR
Rated output voltage 24V 5.1V 5.1V 3.4V 3.4V
Output voltage tol10%, -5% +3%, -4% +3%, -4% +3%, -3% +3%, -3%
Rated output current 4.5A 0.3A 0.7A 2.4A 0.8A
Overcurrent protection
trigger current 7.0A 4.0A 2.0A 3.7A 2.0A
Overvoltage protection
trigger voltage 32.5V 8.0V 8.0V 5.5V 5.5V
Low-voltage power
supply circuit
+3.3Vcircuit
+5Vcircuit
Power supply PCB
+24Vcircuit
Laser
scanner unit
Interlock
switch
Main motor
Control panel
NCU PCB*1
Mojular
jack PCB*1
ADF
ADF motor
ADF sensors
Network PCB*2
DC
controller
PCB
Image
processor
PCB
Reader motor
Sensors
Clutches
Fan
Solenoids
Sensors
+5VR
+24VR
+3.3VR
+5V
+3.3V
+5VR
+24VR
Relay PCB
+3.3VR
+24VR
Cassette
unit*3
+3.3VR
+24VR
+24VR
+24VU
+24V
ADF solenoids
+24V
+3.3VR
+3.3V
+5V
+3.3V
+5V
+5VS
+5V
+24V
+3.3V
+3.3VS
+5VS
*1 : Only if equipped with Fax functions.
*2 : Only if equipped with Network functions.
*3 : Only if equipped with PCL functions.
*4 : Option
CS hp sensor
Analog
processor
PCB
CS unit
+24V
+3.3V
+3.3V
Reader unit
+3.3VR
+24VR
+24VR
+24VR
Modem
PCB*1
+3.3V
+5V
P1
NF
F2
F1
To NCU PCB
+5VR +24VR +3.3VR
SW1
+24VU
Coin vendor*4
+3.3V
Card reader*4
+3.3V
PCL ROM *3
+3.3V