Diagnostic information 2-123
5026
5
1. Replace the fuser.
2. Bring the printer up in Diagnostics Menu
(turn off the printer, press and hold
buttons 3 and 6, then turn on the printer).
3. Navigate to SENSOR TESTS > Dynamic
Sensors > Bubble.
4. Open the front door.
5. Activate the bubble sensor.
Did the bubble sensor change from Open to
Closed?
Problem resolved. Replace the system board.
See “System board
removal” on page 4-155.
Step Questions / actions Yes No
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