Canon iPF825, Service Manual

Page: 118 / 316

Chapter 2
2-48
2.5.4 Paper path system
0020-5570
F-2-41
Media sensor
The photoreflector-type media sensor detects the presence or absence of paper on the platen.
The sensor detects the presence of paper on the platen if it receives sensor light reflected upon the paper.
Roll media detection sensor
Lower roll media detection sensor (iPF851/850/841/840/825/820 only)
The photoreflector-type roll media detection sensor and the lower roll media detection sensor detect the presence or absence of paper at the roll loading port. The
sensors detect the presence of paper if they receive sensor light reflected upon the paper.
Roll media pick-up roller paper detection sensor
Lower roll media pick-up roller paper detection sensor (iPF851/850/841/840/825/820 only)
The photoreflector-type roll media pick-up roller paper detection sensor and the lower roll media pick-up roller paper detection sensor detect the presence or absence
of paper on the pick-up roller. The sensors detect the presence of paper if they receive sensor light reflected upon the paper.
Roll media width detection sensor
Lower media width detection sensor (iPF851/850/841/840/825/820 only)
The photoreflector-type roll media width detection sensor and the lower roll media width detection sensor detect the presence of a wide roll. The sensors detect the
presence of a wide roll fed if they receive sensor light reflected upon the paper.
Roll media pick-up cam sensor
Lower roll media pick-up cam sensor (iPF851/850/841/840/825/820 only)
The photointerrupter-type roll media pick-up cam sensor and the lower roll media pick-up cam sensor detect the pressurization of the pick-up roller when the pick-
up cam rotates to shield the sensor light.
Feed roller HP sensor
The feed roller HP sensor detects a reference white (transmitted) to black (shielded) transition from the encoder at power on and sets a home position for correcting
the eccentricity of the feed roller.
Feed roller encoder sensor
The feed roller encoder sensor detects the rate of paper transport per revolution of the feed roller from slits in the encoder during driving.
Media sensor
Feed roller HP sensor
Feed roller
encoder sensor
Cutter left
position sensor
Cutter HP sensor
(Lower roll media pick-up cam sensor)
Roll media pick-up cam sensor
Roll media pick-up roller paper
detection sensor
(Lower roll media pick-up roller
paper detection sensor)
Roll media detection sensor
(Lower roll media detection sensor)
Roll media width detection sensor
(Lower roll media width detection sensor)
Pinch roller pressure
detection sensor
Pinch roller release
detection sensor