4-8
Troubleshooting and Maintenance
Table 4-1. Diagnostic Troubleshooting Chart
➠
NOTE
Keep the chamber door closed between runs to
keep the chamber clean and dry. If necessary,
wipe off the chamber walls with a dry cloth
before operation.
Do not place containers holding liquid near
the, chamber door. Spilled liquid can damage
electrical or mechanical components.
Diagnostic
Message
Possible Cause
User Action
SPEED
Speed has been set above the
maximum allowable for the rotor; or
wrong, damaged, or missing overspeed
disk on the installed rotor
Check set speed; check the rotor for clean, undam-
aged, and correct overspeed disk (see the
Rotors
and Tubes
manual [LR-IM] for replacement
instructions).
TEMP
Temperature control or vacuum system
malfunctioning
Check the air inlet (at bottom of the front panel) for
obstructions. Call Beckman Coulter Field Service if
problem persists.
DRIVE
Abnormal change in drive speed or
overheated drive
Be sure a rotor is properly installed on the spindle; if
power has failed, wait for 5 minutes for drive to cool;
check for air inlet obstruction.
VAC
Vacuum not being drawn properly
•
Check door O-ring for damage and dirt.
•
Check rotor lid O-rings for possible leakage.
•
Check the vacuum oil. If milky in color, run the
vacuum system for several hours or overnight until
the oil is clear.
IMBAL
Rotor imbalance (at low speeds)
Check for proper rotor loading.
DOOR
Door is open when the
_78%68a
key is
pressed
Be sure door is closed.
PWR
Loss of power during run
Check
TIME
display; the run may need to be
restarted or aborted.
CPU
Microprocessor malfunction or loss of
program memory
No user action. Call Beckman Coulter Field Service.
Summary of Contents for Optima LE-80K
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