Drucker Diagnostics Model 755 Centrifuge - Manual (Page 18)

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1. Problem: The rotor does not spin freely.
Solutions: - Make sure nothing has fallen into the rotor chamber.
- If there is nothing obstructing the rotor, contact your authorized
dealer or The Drucker Company for further assistance.
2. Problem: Excessive noise when the machine is running.
Solutions: - Check to see that the load is balanced.
- Make sure that nothing has fallen into the rotor chamber.
- Make sure that the rotor is installed correctly and that the center
thumb screw is tight.
- Have a technician test the motor and replace it if necessary.
3. Problem: The centrifuge does not run.
Solutions: - Check the electrical outlet.
- Make sure that the power button is depressed. The centrifuge has
power when this button is illuminated.
- Make sure the lid latch is turned completely clockwise to its stop
position. When the lid is closed properly, the latch light on
the control panel will illuminate.
- Check the circuit breaker switch at the bottom right of the machine.
If the switch is white, the breaker has tripped. Contact your
authorized dealer or The Drucker Company for assistance.
- The printed circuit board may be damaged. Have a technician test
and replace the circuit board if necessary.
- The model 755 is equipped with severe out-of-balance detection. If
a severely unbalanced load is run, the unit may terminate the run
shortly after it begins. Balance the load.
4. Problem: The latch light does not come on when the lid is closed.
Solutions: - Make sure that the unit has power.
- Make sure the lid latch is turned completely clockwise to its stop
position. The latch makes contact with a switch underneath the front
top of the cabinet. If this switch is not activated, the light will not turn
on and the machine will not run.
5. Problem: The machine does not unlock after a run has completed.
Solutions: - The lid should remained locked until the rotor has come to a
complete stop and then unlock for 60 seconds. If additional unlock
time is needed, press the ’OPEN / EMERGENCY STOP’ button with
the machine plugged in and the rotor stopped. If the lid remains
locked after this and will not unlock, the electronics may have been
damaged. Contact your authorized dealer or The Drucker Company.
To access the rotor chamber, follow the procedure on page 11,
“Emergency Rotor Chamber Entry”.
6. Problem: The run time is not set to the desired length.
Solutions: - Check the run preset by following the instructions on page 6. If the
preset is not the desired length, follow the instructions on page 7 to
change the preset.
Troubleshooting: