User-Corrected Problems - Hitachi CR22N Instruction Manual

If any of the alarm messages E10 to E95 lights up, it is indicating that the centrifuge has a problem
and requires maintenance by Hitachi Koki service representative. When you call the service
personnel, tell them the displayed alarm code.
NOTE The E10 to E13 alarm codes indicate that the speed sensor is malfunctioning. When this alarm codes
appear, the centrifuge will not accept an input from the CE button for 90 minutes, in order to allow
the rotor to come to a complete stop. Wait without turning off the power to the centrifuge.
Wait at least 90 minutes before pressing the CE button.
(This "90 minutes" is the time which passed after a power failure occurs.)
Some problems are not identified and reported by the self-diagnostic capability of the centrifuge.
To correct these problems, take the actions described in the table below.
Symptom
The initial screen is
not displayed when
the POWER switch is
turned on.
Centrifuge does not
accept entries of run
conditions.
Rotor does not start
accelerating when
START button is
pressed.
Run conditions
cannot be set or
recalled.
Recalled run
conditions
are changed.
Rotor is not cooled.
The backlight level of
the screen is too dark
or too bright.

4-2 User-corrected Problems

Cause
The distribution board of your
centrifuge room is turned off.
ENTER button is not pressed after
entering the numeric values.
The short beep sounds when the
START button is pressed.
The rotor is still rotating.
The battery to back up the
programmed memory is dead.
The room temperature is over
30 ºC .
A heat-producing device such as a
refrigerator or a generator is near
the centrifuge.
The brightness of the screen is not
adjusted.
When the
centrifuge room is turned off, turn on the
distribution board of your centrifuge room
and then turn on the POWER switch.
If the distribution board of your centrifuge
room is turned on, there is possibility that
the earth circuit breaker worked. Contact a
Hitachi Koki service representative.
Press the ENTER button after entering run
parameters.
Check the run conditions again. If the run
parameters are not correct, enter the correct
run parameters and then close the door
securely.
Set or recall the run conditions when the
rotor stops completely.
Set the run conditions again and keep the
centrifuge turned on for 10 hours to
recharge the battery.
Lower the room temperature using an air
conditioner
non-air-conditioned environments.
Relocate the heat-producing device to
another place or contact your local dealer to
ask for relocation of the centrifuge.
Make the adjustment while referring to the
clause "Backlight setting" in Section 2-6-3
"Customizing the settings"
4-3
4-2 User-corrected Problems
Corrective action
distribution board
or lower the speed
of your
in