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.

Release lever lock sensor

A photointerrupter type sensor. This sensor detects the release lever lock status when the release lever solenoid turns ON and the sensor flag shields the sensor light.

Roll encoder sensor

A photointerrupter type sensor. This sensor detects the rotation of the roll holder by reading the encoder film at the roll media drive unit.

2-55

Table of Contents