Drucker Diagnostics QBC Horizon 755VES Centrifuge (120V, 60Hz) - Manual (Page 28)

9.4 TROUBLESHOOTING
A reference guide to common operating problems with the centrifuge is presented below.
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PROBLEM CAUTION ACTION
Centrifuge shows no sign
of power, but primary
electrical supply is available.
Loose power connection. Check all power plugs.
Centrifuge does not operate
when the ON button is pressed.
Lid is not latched. Close and latch lid.
Failure of micro-switch
in latch mechanism.
Request service.
Centrifuge lid will not open,
but primary electrical supply
is available.
Centrifuge rotor is spinning.
An electrical interlock prevents
the lid from opening until rotor
stops spinning. Wait until all motion
ceases.
Latch release delay.
Wait 4-5 s
after rotor stops.
Plunger of latch solenoid
is jammed.
See Section 9.3
and release solenoid plunger.
Centrifuge vibrates excessively.
(Note: momentary vibration is
normal during acceleration,
but should disappear upon reaching
full speed.)
Press power button OFF
to stop rotation.
See Action steps.
(Note: Centrifuge is capable
of 30º tilt without causing excessive
vibrations.)
a) Be sure tube load is properly
balanced.
b) Tighten rotor nut with wrench,
replace and tighten rotor cover.
Close top lid
and re-check for vibration.
c) Check that surface does
exceed 30º tilt limit.