Lexmark 4039-1XX - Manual (Page 46)

Diagnostic Aids 32
4039-1XX
Diagnostic Aids
Diagnostics Mode
To run some of the printer diagnostic tests described in this chapter,
you must put the printer in Diagnostics mode.
To enter Diagnostics mode:
1. Turn the printer off.
2. Press and hold the Ready and Return buttons. Then turn the
printer on. The printer performs the Power-On Self Test.
3. Release the buttons when [Performing Self Test] is displayed.
4. You can exit Diagnostics mode without a POR by selecting
[Reset Printer].