Dell 5230dn Mono Laser Printer Service Manual - Page 298

If media runs out in a media tray assembly, the actuator lowers and the actuator flag, unlocks the sensing area of the sensor (media empty). The sensor light is transmitted. When the sensing area is blocked (media is present), the signal is off. Sensor (media low) This sensor detects by the actuator position whether media in the media tray assembly is low. When the flag of the actuator blocks, then unblocks the sensing area of the sensor (media low), the media level is determined to be low Tray 2 media tray assembly Rear media guide Bottom plate Note: Media Size No Tray B5L/7.25" x 10.5"L 8.5" x 11"L A4L End guide S/W1 Off Off On On Analog switch S/W3 Off On Off On 3-92 Service Manual