Lexmark X734de Service Manual page 181

Step Questions / actions
1. Replace the fuser.
5
2. Bring the printer up in the Diagnostics
menu (turn off the printer, press and hold
3 and 6, turn on the printer.)
3. Touch SENSOR TESTS.
4. Touch Dynamic Sensors.
5. Touch Bubble.
6. Open the front access door and the top
access cover.
7. Activate the bubble sensor flag (A).
Did the bubble sensor change from Open to
Closed on the touchscreen?
Yes
Problem resolved.
7526
No
Replace the system board.
See
"System board
removal" on page 4-165.
Diagnostic information
2-143
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