CytoTherm CT-DR Owner's Manual - Page 6
Browse online or download pdf Owner's Manual for Laboratory Equipment CytoTherm CT-DR. CytoTherm CT-DR 10 pages. Dry plasma thawing with rocking action
Print Page
TROUBLESHOOTING
English: Unit should be opened by qualified technicians only.
French: Ne puet être ouvert que un techicien autorize.
Unit is "dead"
Computer does not boot when
turned on. Does not display
readable messages.
Display says "low water" but
there is water.
Unit does not heat but
"heating" is displayed
Bag leaked, but does not
trigger alarm and "LEAK"
message..
Temperature calibration does
not "hold", it changes .
Temperature calibration is out
of range.
Pump does not circulate. No
hum.
Pump does not circulate.
Makes humming noise.
Waterbath not rocking.
MESSAGES
, Troubleshooting
COLD indicates that the water temperature is less than 20.0C. As soon as the temperature rises above 20C, it
will display the true temperature.
Verify that you are plugged into a live, grounded outlet.
Have qualified technician check if fuse is blown or connectors are
loose. There are three fuses (see wiring diagram) in the unit. Fuse-1 &
Fuse-2 are located on the circuit board: 8Amp for 120Vac models and
5A for 240 Vac models. Fuse-3 is a ¾ Amp slow blow inline fuse on
the transformer 12 Vac line.
Unit is not responding, but the display is backlit. Backlit display
indicates that the unit has power. Turn unit off for at least 10 seconds
and turn unit back on. If this does not solve problem, replace the
computer (program module part# CDR-PM).
The unit is not sensing that water is present.
a. Make sure you are using tap water or adding salt to deionized
water to make it conductive.
b. The level sensor (screw inside the BATH on the right side) is dirty.
Scrape it and then clean with alcohol.
Was the unit filled with water over 40C.? If yes then cool the water to
20C to reset the safety thermostat.
Check the Safety thermostat (#C-TH) and the heaters (#14-77) for
continuity.
Unplug and Plug in the SENSOR CONNECTOR. If there is still a
problem, contact CytoTherm.
Replace temperature sensor (#CT4-TS).
Have technician check the voltage at TP1 (see wiring diagram) , it
should be 0.395 +/- .001 Vdc. If TP1 was correct, replace the
temperature sensor (#CT4-TS).
If TP1 was not correct, restore the unit to initial factory settings (see
DIAGNOSTICS) do full calibration. See Technician Functions > Full
Calibration.
No power to pump or pump winding open. Check the umbilical
connector. Check the pump (#14-PM). DO NOT
DISASSEMBLE PUMP.
Blow air through pump outlet tubing to clear small obstruction.
Check pump (#14-PM). DO NOT DISASSEMBLE. Any
evidence of leaking on motor side means pump must be
replaced.
Check if cam is loose on motor. Check the rocking motor (#C-
RM).
6