HP V8.5 manual Film media, Media Sensors

5

T H E O R Y O F O P E R A T I O N

Film media

When the plotter is set to film mode, the strobe length is increased to accommodate the thicker media. The plot speed is set to

1.0inch per second to allow the longer strobe length and to maintain plot quality.

5.5MEDIA SENSORS

The top-of-form (also known as the “I-mark”) sensor and the media sensor are contained on a media sensor board .

The top-of-form sensor consists of a focused infrared beam and receptor that reacts to black top-of-form marks. The receptor sends a “stop form feed” command to the logic circuitry if a mark stops the beam from reflecting back into the receptor.

The paper sensor consists of an unfocused infrared beam and receptor. If the receptor receives enough reflected light, the receptor sends no command. If the reflected light is below the required level the receptor sends a “media out” command to the logic circuitry and plotting stops. The “no media” indicator is displayed on the control panel.

5 - 10 V8.5eRev2.2.2002