4-64. CONDENSER FAN MOTOR (B2)
a. Test (Installed)
(1) Check to see that power has been disconnected.
(2) Check motor for rotational freedom by spinning fans. If there is any stiffness or binding, contact direct
(3) Check motor bearings for lateral or end play, If there is excessive lateral or end play, contact direct support
(4) Electrically test motor at J2 connector as follows:
Disconnect motor cable connector P2.
Use a Multimeter set on lowest OHMS scale to check continuity between pins A and B, A and C, and
B and C in connector. If there is no continuity between any pair of pins, the motor winding is open.
Use a Multimeter set on lowest OHMS scale to check for continuity between each pin in connector
(A, B, and C) and the motor housing, If there is continuity between any pin and motor housing, the
motor winding is shorted. Replace the motor.
Use a Multimeter set on high OHMS scale to test stator insulation by checking between each pin in
connector (A, B, and C) and motor housing, A reading of less than 500,000 ohms indicates insulation
failure. Replace motor.
Check continuity between pins D and E. If there is no continuity, this indicates an open thermostat.
Contact direct support maintenance.
If all of the above inspections and tests are satisfactory, but the motor will still not operate
properly, notify direct support maintenance, who may desire to make further tests before
motor is removed.
Removal (Requires two people)