Lexmark X734de Service Manual page 246

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6.
Use the packaging that came with the printhead FRU to prop the printhead up.
Note: It is important to position the laser in the printhead facing down into the packaging as shown.
7.
Connect the power cord to the outlet.
8.
Enter the Diagnostics menu (press and 3 and 6, turn on the multifunction printer, and release the buttons
when the progress bar appears).
9.
Perform the Mirror Motor Test:
a.
Touch PRINTHEAD TESTS.
b.
Touch Mirror Motor Test.
The touchscreen displays Mirror Motor Test—Motor Running....
After the test completes, the touchscreen displays either Pass or Fail.
•
If the test fails, replace the system board.
•
If the test passes, perform the Servo Laser Test in step 9.
10.
Perform the Servo Laser Test:
a.
Touch Back to PRINTHEAD TESTS.
b.
Touch Servo Laser Test.
The touchscreen displays Servo Laser Test—Motor Running....
After the test completes, the touchscreen displays either Pass or Fail.
•
If the test fails, replace the system board.
•
If the test passes, install the printhead FRU.
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Service Manual
CAUTION—POTENTIAL EYE INJURY:
Laser Radiation—Avoid eye exposure to the beam. Always
point the printhead laser down into the packaging as shown.
The laser can cause damage to your eyesight or the eyesight of
others.