Lexmark T642 Service Manual - Page 178

4061-xx0 Top Margin (duplex) This setting controls the offset between the first scan line on the front of the duplex page and the first scan line on the back of the page. Therefore, be sure to set the top margin in REGISTRATION before setting the duplex top margin. See "REGISTRATION" on page 3-4. To set the Top Margin (duplex): 1. Print the Quick Test (duplex): a. Select Quick Test from DUPLEX TESTS. b. Select Single. c. Hold the page to the light to see the whether the top margin of the backside aligns with the top margin of the frontside. 2. Select Top Margin from DUPLEX TESTS. 3. Use or to select the margin setting you need to change. • Each increment shifts the duplex top margin by 1/100 of an inch. • The Top Margin (duplex) range is -20 to +20, and the default value is 0. • An increase moves the top margin down and widens the top margin. A decrease moves the top margin upward and narrows the top margin. 4. Press . 5. Print the Quick Test (duplex) again to verify the adjustment. Repeat if necessary. Sensor Test (duplex) This test is used to determine whether or not the duplex sensors and switches are working correctly. The test allows you to actuate the duplex input sensor located in the back part of the duplex unit and the duplex exit sensor located in the return paper path. 1. Select Sensor Test from DUPLEX TESTS. The message Sensor Test Testing displays. 2. Manually actuate each of the duplex sensors. When the sensor/switch is closed, CL (closed) displays, and when the sensor/switch is open, OP (open) displays. • Duplex input sensor • Duplex exit sensor 3. Press Back ( ) or Stop ( ) to exit the test. 3-10 Service Manual