Paper Path System - Canon iPF605 Service Manual

Chapter 2
The diode voltage that changes with the nozzle unit temperature is reported to the main controller via the carriage PCB.
The detected head temperature is used to control the head operation and to detect abnormal head temperatures.
Printhead contact detection
The printhead contact status is detected by testing the electrical conductivity.
It is detected according to the voltage changes at the two terminals of the contact faces, power supply terminals, and GND terminal.

2.5.4 Paper path system

Cutter HP sensor
Cutter right position
sensor
Paper detection sensor
This is a photo-interrupter-type sensor. When paper is supplied from the paper tray, or roll feed unit, the sensor light is blocked by the sensor arm, thus detecting
paper.
Spur cam sensor
This is a photo-interrupter-type sensor.
When the sensor light is shielded by the rotation of the spur motor, the printer detects that the spur unit is at the upper-limit position.
When the sensor light is unshielded by the rotation of the spur motor, the printer detects that the spur unit is at the bottom position.
The spur height is controlled by driving the spur motor with a predetermined number of pulses.
Cutter HP sensor
This is a photo-interrupter-type sensor. This sensor detects that the cutter is at the home position (left end).
Cutter right position sensor
This is a photo-interrupter-type sensor. This sensor detects that the cutter is at the right end.
2-46
Paper detection sensor
F-2-51
0019-6112