Canon W6400 Series, Service Manual

Page: 73 / 196

Chapter 2
2-29
DI sensor reading control
The DI sensor value in the printhead and head rank are obtained for each color and sent to the engine controller based on the control signals that are sent
from the engine controller.
Environment temperature reading control
The environment temperature detected by the thermistor (TH1101) on the head relay PCB is sent to the engine controller based on the control signals that
are sent from the engine controller.
Relay for head logic driving power supply
The logic driving power (5 V) is supplied to the printhead based on the control signals that are sent from the engine controller.
b) Thermistor (TH1101)
The thermistor sends the environment temperature in the vicinity of the head relay PCB to the engine controller after passing through the carriage relay
PCB.
2.4.6 Power Supply
2.4.6.1 Power supply block diagram
0008-6357
F-2-33
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. Also, only the carriage motor d26. 5 V
power is turned off when the upper cover is opened.
Operation panel
Inverter
transformer
DC power
supply
control circuit
+5.1 V/+3.3V
generation
circuit
+26.5 V
generation
circuit
STANDBY
Active filter circuit
Noise filter circuit
Engine controller
AC inlet
100 V to 240 V
Power supply
System controller
Carriage motor driving power: +26.5 V
+26.5V
+5.1V
+3.3V
START
DC power
supply
control circuit