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.

2-48

Pinch roller release

detection sensor

Pinch roller pressure

detection sensor

Roll media pick-up cam sensor

(Lower roll media pick-up cam sensor)

Roll media width detection sensor

(Lower roll media width detection sensor)