The feed roller HP sensor detects the change from the white portion (unshielded sensor light) to black portion (shielded sensor light) of the encoder film on the feed

roller, thus setting the home position for feed roller eccentricity compensation.

Feed roller encoder

The feed roller encoder detects the slits on the encoder film of the feed roller during feed motor rotation, thus detecting the amount of rotation of the feed roller

(media feed amount).

Roll media sensor

This is a photo-interrupter-type sensor. When media is loaded, the the sensor arm blocks the sensor light, thus detecting the media.

Roll cam sensor

This is a photo-interrupter-type sensor. When the roll cam blocks the sensor light, lowering of the transport roller (contact with the roller) is detected.

2.5.5 Others

Temperature/humidity sensor

This sensor detects the temperature and humidity around the printer so that the measured values are used for head height adjustment, idle discharge control, waste

2-42

F-2-58

F-2-59

Roll cam sensor

0013-4393

Table of Contents