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4-4
Troubleshooting
Table 4-1. Diagnostic Message Chart (continued)
Diagnostic Number/
Message
Problem
Result
Recommended Action
H4/
Speed error
a) a run is in progress
(at speed or
accelerating)
b) the operator changes
the speed to 0 rpm by
pressing
[
SPEED
]
, 0,
[
ENTER
]
rather than
by pressing the
[
STOP
]
key
c) the operator then tries
to increase the speed
by pressing
[
SPEED
]
,
entering a new
speed, and pressing
[
ENTER
]
.
The centrifuge does not
accelerate, and the H4
diagnostic occurs.
(Note that during a run,
the speed can be
changed from any
speed other than 0 by
pressing
[
SPEED
]
,
entering the new
speed, and pressing
[
ENTER
]
.)
Press
[
STOP
]
(green light on
[
START
]
key will turn off), then
press
[
CE
]
to clear the diagnostic.
Set the new run speed and then
press
[
ENTER
]
,
[
START
]
to begin a
new run.
I1/
Imbalance error
Rotor load is severely
out of balance
Run shuts down with
maximum brake
• Make sure that tubes or bottles
are loaded symmetrically in the
rotor.
• With swinging bucket rotors,
lubricate the buckets according
to the rotor manual instructions.
Unlubricated pivot pins can
prevent the buckets from
reaching horizontal position,
which can cause imbalance.
—
During low-temperature
runs (near –10°C), ice
forms around the door
opening
Door will not open at
the end of a run
Press firmly in several locations
around the door opening, then
depress the foot pedal again.
To minimize icing, wipe moisture
from the chamber, the chamber
gasket and the inner door surface
before each run. Keep the door
closed as much as possible.
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