Lexmark 4049LMO Service Manual - Page 67
Duplex Feed 1 Test, Diagnostic Aids 3-6
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4049-XXX Duplex Feed 1 Test This test checks for slipping paper problems. It verifies that the paper is entering the duplex unit far enough for the trailing edge to clear the selector fingers before the paper reverses direction. 1. Enter Diagnostics mode. 2. Select [DUPLEX TESTS]. 3. Select [Duplex Feed 1]. 4. Select [Tray 1], or [Tray 2]. Note: Paper feeds all the way into the duplex unit and stops. 5. The message [Clear Paper] appears on the display. 6. Slide the tray extension all the way out until it stops. 7. Push a small screwdriver through the lower end of one of the ventilation slots and through the sheet of paper fed in under the slot. 8. Open the cover and remove the sheet of paper. 9. Measure the distance from the mark on the paper to the trailing edge of the paper. If the mark, or hole, is more than 85 mm from the trailing edge, there is a paper slipping problem with the duplex unit paper feed. Duplex Feed 2 Test This test verifies that paper feeds through the duplex unit properly and tests the stop point of the page as it feeds back over the top of the duplex paper tray. 1. Enter Diagnostics mode. 2. Select [DUPLEX TESTS]. 3. Select [Duplex Feed 2]. 4. Select [Tray 1] or [Tray 2]. Note: Paper feeds all the way into the duplex unit and then feeds out and stops on top of the paper tray. 5. The message [Clear Paper] appears on the display. 6. Open the printer top cover. 7. If you are doing the test with legal size paper, open the top cover of the duplex unit. Diagnostic Aids 3-6