Lexmark C750 Service Manual - Page 207

5060-00x DUPLEX TESTS These tests display if a duplex option is installed. Quick Test This test verifies if the Duplex Option Top Margin is set correctly. This test prints a duplexed version of the Quick Test Page that can be used to adjust the Top Margin for the backside of the duplexed page. You can run one duplexed page (Single) or continue printing duplexed pages (Continuous) until Return or Stop is pressed. You must use either Letter or A4 paper. To run the Duplex Quick Test: 1. Select Quick Test from the DUPLEX TESTS menu. 2. Select Single or Continuous. • The single Duplex Quick test cannot be canceled. • The printer attempts to print the Quick Test Page from the default paper source. If the default paper source only supports envelopes, then the page is printed from Tray 1. • Check the Quick Test Page for the correct offset between the placement of the first scan line on the front and back side of a duplexed sheet. • If adjustment is necessary, the Top Margin Offset must be adjusted first. The range of the adjustment is -25 to +25. The Duplex Top Margin Offset range is -20 to +20. • Adjustment of this setting lets you shift up or down the position of the Top Margin. Changing this parameter by 1 unit moves the margin 1/100 inch. A positive offset moves the text down the page and widens the top margin, while a negative offset moves the text up the page and narrows the top margin. Press Return or Stop to exit the test. 3. Check the Top Margin Offset of the base printer. Top Margin Modification of this setting controls the offset between the placement of the first scan line on the front and back side of a duplex sheet. Changing the value by 1 unit moves the margin by 1/100 inches. A positive value moves the text down the page and widens the top margin. A negative value moves the text up the page and narrows the top margin. Sensor Test This test determines whether or not the Duplex sensors and switches are working correctly. Select Sensor Test from the DUPLEX TESTS menu. Manually actuate each of the duplex sensors. When the sensor/switch is closed, CL (closed) displays, when the sensor/switch is open, OP (Open) displays. • Duplex input sensor • Duplex exit sensor Press Return or Stop to exit the test. Diagnostic aids 3-23