Precor Experience 700 Series Service Manual page 276

Drive motor Phase winding test
CAUTION: All resistance measurements must be performed with power removed
from the machine. Performing the resistance measurements with voltage applied
to the circuit can damage the multimeter.
6. Switch the treadmill ON/OFF switch to OFF. Disconnect the Drive Motor cable con-
nector from the MC MOTOR output connector. Set the multimeter to measure res-
istance (ohms). Measure resistance between the Drive Motor cable MC MOTOR
connector between the red wire (pin 4) & white wire ( pin 5), the red wire (pin 4) &
black wire (pin 6) and the white wire (pin 5) & black wire (pin 6). Each measurement
should be approximately 2.5 ohms. If any one of the measurements are significantly
high (an open circuit) or zero (a short circuit), replace the Drive Motor.
CAUTION: Connector pin terminals can be easily sprung and damaged. Take
care and use light probe contact pressure when making multimeter meas-
urements. DO NOT insert large diameter probes into the plug terminals which will
spring and damage the pin terminals.
7. If the Drive Motor passed the motor winding resistance test, inspect the female pins of
the Drive Motor cable MC MOTOR connector. Verify that the pins are not spread
apart "sprung" beyond the point of making good contact with the MC MOTOR con-
nector male pins. If the Drive Motor connector pins are damaged, attempt to repair the
connector terminals using a crimp tool for a MOLEX plug #39--01-2060 with pin ter-
minals MOLEX #45750-3111 (recommended MOLEX pn 0457503112 crimp tool). If
the connector cannot be repaired, replace the Drive Motor.
8. If you have performed all of the procedures above and have been unable to correct
the problem, call Precor customer support.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
7 Troubleshooting
System Troubleshooting Procedures
Page 266