Labnet Spectrafuge 16M Microcentrifuge Service Manual - Manual (Page 10)

8
Section 4
2) Unplug the motor connection from the PCB.
3) Loosen the ground nut and remove the motor ground
lead (figure #4, pg 14).
4) Remove the 4 motor nuts on the bottom of the base-
plate (figure #5, pg 15). Remove motor assembly and 4
star washers under the isolators from unit, noting the
orientation and routing of motor and ground leads.
5) Install new motor assembly (with star washers on
isolator studs) in chassis in the same orientation as the
old motor. Attach and tighten the 4 motor nuts on the
bottom of the unit. Be sure the isolators are not twisted.
6) Plug the motor connector into the PCB and attach
ground lead under ground nut and tighten securely.
7) Make sure air channels are installed down against
foam.
8) Reinstall upper casing shell and tighten screws se-
curely.
9) Calibrate speed as previously described on page 6.
10) After calibration, reinstall metal chute.
Speed must be recalibrated after replacing the motor.
Failure to do so may result in serious injury.
PRINTED CIRCUIT BOARD (PCB)
The majority of failures that cannot be attributed to the motor can be traced to printed circuit board
component failure. If the fault has been isolated to the PCB, it is recommended that a new board be
installed. For those who prefer to troubleshoot to the component level, board diagrams are provided in
Section 7.
Verifying Connections All of the various centrifuge components are connected to
the PCB. Depending upon the nature of the fault, the
technician should verify that these connections are secure,
while the unit is disconnected from the power source.
Replacing the PCB Tools required: Phillips screwdriver
1) Remove the upper casing shell as previously described.
CAUTION