Paper Path System - Canon W6400 Series Service Manual

Chapter 2
the carriage relay PCB.
The head temperature information is used to control the operation of the head and to detect abnormal head temperatures.
Printhead contact detection
The status of direct contact between the contact faces of the printhead and the carriage is checked by testing the electrical conductivity.
The contact status between the two faces is detected from the voltage changes of the flexible cable connecting two separate terminals on the contact surface
of the printhead, the power supply terminal, and the GND terminal.

2.5.4 Paper path system

Media sensor
The photo reflection-based media sensor detects if paper is on the platen.
The sensor detects the presence of paper by receiving the sensor light reflected from the paper.
Feed roller home position sensor
The feed roller home position sensor detects the change from white (transparent) to black (opaque) of the reference area of the scale on the code wheel
when the power is turned on and sets the home position for LF decentration correction.
Feed roller encoder
The feed roller encoder detects the carriage position from the feed roller pulley slit when driving.
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Feed roller home
position sensor
Feed roller encoder
Media sensor
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