Apple LaserWriter300 Spécifications télécharger pdf (Page 6)

Basics Sensing System Theory - 4

Each consists of an actuator and a U-shaped photo

interrupter that is soldered to the controller assembly. If

the actuator is present inside the U, the circuit closes; if

the actuator is absent, the circuit opens. In ready state the

appropriate circuit is closed.

The paper sensors are actuated as an arm or lever swings

against the paper as it moves through the printer.

Sensor Functions

The cassette empty sensor PS304 detects whether there is

paper in the cassette tray. If the printer is set for cassette

feed and the cassette is empty, sensor PS304 determines

that a paper-out condition exists.

Registration paper sensor PS302 detects the presence of

paper in the manual-feed slot and detects misfeeds of both

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Apple LaserWriter300 Spécifications Page 6