Canon iR4570 Series, Service Manual

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Chapter 10
10-7
F-10-3
10.3.3 Sequence of Operation
0006-5390
iR2270 / iR2870 / iR3570 / iR4570
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.
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
CPU
24V or 13V
24V 13V
Voltage
switching circuit
DC controller PCB
Full-speed
signal
Half-speed
signal
Clock signal
Fan