Power Supply; Power Supply Block Diagram - Canon WS8400 Service Manual

2.4.7 Power Supply

2.4.7.1 Power supply block diagram

Operation
panel
STANDBY
The universal power supply converts AC voltages ranging from 100 V to 240 V supplied from the AC inlet to DC voltages for supplying the driving
voltages of ICs, motors, and other parts.
The voltage generating circuits are divided into the power supply system for driving the motors (+26.5 V) and sensors (+5.1 V) and the power supply
system for driving the logic circuits (+3.3 V).
The +26.5 V/+5.1 V system uses a combination of START signals sent regularly from the power supply and power button signals to control the STANDBY
signals and turn the power on and off.
During power save mode, the STANDBY signals are controlled to turn off the +26.5 V/+5.1 V output.
In addition, a switch to turn ON/OFF the carriage motor drive +26.5V power only is provided on the upper cover. The carriage motor drive +26.5V power
goes OFF when the upper cover is opened.
Motor driver
motor driver power:
+26.5V
Engine
controller
DC power
supply control
START
circuit

Power supply

+26.5V
generation
+26.5V circuit
Engine
controller
DC power
supply control
circuit
+5.1V
+5.1V/+3.3V
generation
circuit
+3.3V
F-2-36
AC inlet
100 V to 240 V
Noise filter
circuit
Inverter
transformer
Active filter
circuit
Chapter 2
0009-1530
2-35