Canon W8400 Series, Service Manual, Page: 83 / 224

Chapter 2
2-33
2.4.5 Head Relay PCB
2.4.5.1 Head relay PCB components
0009-1529
F-2-34
a) Latch IC (IC1101)
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.
IC1101
TH1101