Canon iR3570 Series, Service Manual

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Chapter 10
10-4
F-10-4
10.3.3 Sequence of Operation
0006-5390
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
1. Standby Mode, Sleep Mode
In standby mode or sleep mode, the heat discharge fan (front, rear; FM1/2) is at rest.
2. Printing
While printing is under way, the fans are switched between full speed and half speed depending on whether the machine is in full speed mode or half speed mode
and the reading of the environment sensor (HU1).
- Double-Side Printing
T-10-4
- Single-Sided Printing
T-10-5
Note 1:
While the machine is in continuous printing mode, the insertion of one or more double-sided prints will start the control used for double-sided printing.
Note 2:
The printing interval covers the interval up to when the fixing motor (M3) stops rotation.
10.4 Power Supply System
10.4.1 Power Supply
10.4.1.1 Route of Power Inside the Printer Unit
0008-0541
iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N
The machine's DC power is controlled by the printer unit power supply PCB.
The following shows the functions of the individual power supply PCBs used or accessories and the distribution of power:
T-10-6
Environment sensor (HU1) reading Full speed, half speed
25 deg C or more Full speed
Less than 25 deg C Half speed
Environment sensor (HU1) reading Full speed, half speed
30 deg C or ore Full speed
Less hand 30 deg C Half speed
Name Description Remarks
Printer unit power supply PCB Generates DC power (24 V, 13 V); supplies DC power to the
controller power supply PCB and cassette pedestal.
Accessories power supply PCB Supplies power to the side paper deck, buffer path, and finisher.
Main switch Turns on/off the power to the AC driver PCB.
Door switch Turns on/off 24 VU1 to the DC controller PCB.
Leakage breaker Cuts power in the event of an error.
Environment heater switch PCB Turns on/off power to the cassette heater, printer unit heater, and
deck heater.
Optional
High-voltage power supply PCB Generate various high voltage.
AC driver PCB
Supplies AC power to the printer unit power supply PCB,
accessories power supply PCB, Supplies AC power to all-night
power supply PCB; drives the fixing system.
Controller power supply PCB Supplies DC power to the 3-way unit, fax board, controller, HVT
and DC controller PCB; generates DC power (13V, 5V, 3.3V).
Generates DC power (5V,3.3V).
All-night power supply PCB Generates and supplies all-night power (3 VB).
CPU
24V or 13V
24V 13V
Voltage
switching circuit
DC controller PCB
Full-speed
signal
Half-speed
signal
Clock signal
Fan