Precor TRM 885.v2 Service Manual page 51

1. Connect an AC voltmeter between terminals 4 (red) & 5 (white) of the OUTPUT connector on
the Motor Controller. See Figure Below. Set the treadmill's on/off switch to the ON position.
Press the QUICK START key. If the Motor Controller is supplying output, you will
momentarily read some value of AC voltage. Make a note of the value and set the treadmills
on/off switch to the OFF position.
2. With the treadmill's on/off switch in the OFF position, repeat the procedure in step 1 between
terminals 4 (red) & 6 (black) of the OUTPUT connector on the Motor Controller. Voltage
should read the same value as in step 1. Set the treadmill's on/off switch to the OFF position.
3. With the treadmill's on/off switch in the OFF position, repeat the procedure in step 1 between
terminals 5 (white) & 6 (black) of the OUTPUT connector on the Motor Controller. Voltage
should read the same value as in step 1. Set the treadmill's on/off switch to the OFF position.
If one or more of the voltage readings in steps 1 through 3 are not present, replace the Motor
Controller. If the voltage readings in steps 1 through 3 are present, continue with step 4.
NOTE: All resistance measurements must be performed with power removed from the
treadmill. Performing the resistance measurements with voltage applied may damage
your multi-meter.
4. Set the treadmill's on/off switch to the OFF position. Disconnect the drive motor connector
from the OUTPUT connector on the Motor Controller. With an ohmmeter, measure between
terminals 4 (red) & 5 (white), 4 (red) & 6 (black) and 5 (white) & 6 (black) of the drive motor
connector. Each reading should be approximately 2.5Ω. If any of the readings are
significantly high or open, replace the drive motor.
5. If the resistance readings are correct, inspect the female terminals of the drive motor
connector. Verify that they are not spread beyond the point of making good connection with
the male pins on the OUTPUT connector on the Motor Controller. If proper connection is not
being achieved, the connector CAN BE repaired (using the appropriate crimper and
connector ends) as a preferable solution to replacing a costly drive motor.
6. If you have performed all of the procedures above and have been unable to correct the
problem, call Precor customer support.
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