HP 5890 SERIES II Service Manual page 180

TURN OFF THE POWER TO THE INSTRUMENT IMMEDIATELY IF THERE IS EVIDENCE
OF THE FAN BLADES CONTACTING ANYTHING DURING OPERATION, AND/OR IF
THERE IS UNDUE VIBRATION. VIBRATION MAY INDICATE BENT FAN BLADES
AND/OR A BENT MOTOR SHAFT.
31, Restore power to the instrument.
32. Check that the oven controls properly at some selected temperature (e.g., 100_C).
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SVC 5- 18