Lexmark 2380 Service Manual - Page 54

Paper Select Sensor Service Check If form feed length is off by about 1 inch (25 mm), enter Setup Mode and verify that the form length setting is correct. See the Setup Mode and Switch Settings section. FRU 1 Paper Select Sensor Action Remove all paper from the printer and place the tractor in the push position. Make sure the Auto Sheet Feed (ASF) is set to OFF in the Setup Mode. Press Form Feed and time how long the gear train rotates. With the paper select lever in the cut sheet position (sensor open) the gear train should rotate for less than 2 seconds; with the lever in the continuous forms position (sensor closed), the gear train should rotate for more than 3 seconds. If the printer does not do this, inspect the sensor to make sure it is being opened and closed by the paper separator. Disconnect CN5 from the sub logic board and measure the paper selector sensor resistance from CP5-1 to CP5-2. Replace the sensor if the resistance does not change from zero to infinite as the paper select lever is moved from cut sheet to continuous forms. If the sensor is good but the gear train does not run the right length of time, set the head gap to position 1 and disconnect the short flexible cable from CN3 on the main logic board. Check the continuity between CP3-6 (paper select sensor) and GND while actuating the paper select lever. Cut Sheet Continuous Forms 23XX-001 23XX-002 1K ± 0.5K ohms 0K ± 0.5K ohms 12K ± 0.5K ohms 3.5K ± 0.5K ohms If the resistance is correct, replace the main logic board. If the resistance is incorrect, replace the sub logic board. 2-30