Beckman Couler ALLEGRA X-12/R, Service Manual, Page: 39 / 83

Section 3: Service Procedures
3.1.7 Brake Resistor, EMI Filter or Receptacle Replacement
A. Remove the electrical panel by removing 8 button head screws attached in the back of
the instrument.
B. Remove two screws that hold the brake resistor bracket in place.
C. Replace brake resistor
D. Remove two screws that are attached to the EMI filter and replace filter.
E. Remove two screws that are attached to the receptacle and replace receptacle.
3.1.8 Imbalance Adjustment and Calibration Allegra X-12 series
Imbalance Calibration: The centrifuge is calibrated for imbalance prior to shipment. The
calibration value can be reentered by pressing “ENTER”, “613”for each individual rotor.
Recalibration is required if the optical flag is replaced, moved or if a new control board or
motor is installed. To run a rotor a calibration value is needed. The rotors used for
calibration depend on the library of rotors present in the customer’s lab
.
Flag needs to be adjusted at .6 inch.
A. Refer to the table below to determine which rotor and loads to be used for calibration.
B. From the centrifuge rotor table, select the appropriate rotor.
C. Install the appropriate test loads per the table below.
D. Press “ENTER”, “611” “ENTER”, “START”.
E. The centrifuge will run the rotor to speed and brake to a stop.
F.
Press “CE” when prompted by the centrifuge.
G. Repeat steps A through F as required.
Calibration Rotors Customer Rotor Library Loads to be used
SX4750 SX4750 2x 700g pos 1&2+2x 750g (1.2d) Pos 3&4
SX4750A SX4750A 2x 750g pos 1&2 +2x 625g (1.2d) Pos 3&4
FX6100 FX6100 5x 47ml + 1x 62ml (water)
3-6 Allegra X-12/R, X-15R Service Manual 07/07