Lexmark Optra E 4026-0 Series Reference Handbook page 109

Paper Feed Test
This test allows you to observe the drive gear train and feed paper
through the printer to check for broken gear teeth, watch the paper path,
or check the erase lamps.
Note: You may want to remove the gear cover before starting this test
so you can observe the motor gears.
1. Enter Diagnostics mode.
2. Select [Paper Feed].
3. Select [Tray 1], [Tray 2], or [Manual].
4. Select [Single] or [Continuous].
5. Select [CANCEL] to stop continuous.
6. Press RETURN to get back to Diagnostics mode main menu.
Permanent Page Count
The permanent page count can be displayed only. It cannot be modified
or reset by the customer or servicer.
1. Enter Diagnostics mode.
2. Select [Permanent Page Count].
3. Press RETURN to return to Diagnostics mode main menu.
Print Contrast (Transfer on "plus" machines)
This setting changes the transfer roll voltage to light, medium, or dark
(low, medium, or high on "plus" machines), but will seldom produce a
visible difference in print darkness. This setting may be useful in
environmental extremes to prevent toner from being deposited in white
areas next to large black areas.
1. Enter Diagnostics mode.
2. Select [Print Contrast].
3. Select [Light], [Medium] or [Dark], ([Low], [Medium] or [High] on
"plus" machines).
4. Press RETURN to return to the Diagnostics mode main menu.
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Laser Printer Reference Handbook