Canon image Prograf iPF780 Series, Service Manual

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Chapter 2
2-47
2.4.5 Power Supply
2.4.5.1 Power supply block diagram
0013-4333
F-2-35
The power supply converts AC voltages ranging from 100 V to 240 V from the AC inlet to DC voltages for driving the ICs, motor, and others.
The voltage generator circuits include the +26 V generation circuit for driving motors, fans, and sensors and a +21.5 V generator circuit for driving sensors, heads,
logic circuits, and others.
When the power is turned off, +26 V and +21.5 V are reduced to about 12 V and 9 V respectively (power save mode).
Power ON/OFF operation is controlled by the main controller PCB.
Operation panel
Transformer
DC power supply
control circuit
+21.5V
generation circuit
+26V
generation circuit
POWER ON
Rectifying circuit
Noize filter circuit
AC inlet
100V to 240V
Power supply Main controller PCB
+5V/+3.3V
generation circuit