Lexmark 4039-1XX - Manual (Page 50)

36 Service Manual
4039-1XX
A message describing test progress is displayed during the test.
1. Enter Diagnostics mode.
2. Select [Device Test]
3. Select [Disk Test/Clean].
4. Select [CONTINUE] to start the test, or [CANCEL] to return to
Diagnostics mode main menu.
5. Select [CANCEL] to interrupt the test.
6. Press Return to return to Diagnostics mode main menu.
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 stop.
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 95 mm from
the trailing edge, there is a paper slipping problem with the
duplex unit paper feed.