Precor C954 Serivce Manual page 28

10. If the reading in step 9 was normal, either or both of the blue and brown wires is bad. Check
the wires from end to end with an ohmmeter, the reading should be less than 1Ω. If either
wire reads open or significantly high, replace the wire.
11. If you have performed all of the above procedures and have been unable to correct the
problem, call Precor Customer Support.
12. Set the treadmills circuit breaker in the "off" position. Replace fuse F3. Remove the fan wires
from terminals M2 (blue) and M3 (brown) of the lower logic PCA. See Diagram 5.2. Set the
treadmills circuit breaker in the "on" position. Carefully measure the voltage between
terminals M2 & M3 of the lower logic PCA. The meter should read AC line voltage (120 Vac
or 240 Vac). If the reading is 0 or significantly low, replace the lower logic PCA.
13. Set the treadmills circuit breaker in the "off" position. Using an ohmmeter, measure the
resistance between the blue and brown wires removed in step 12. If the resistance is
significantly lower than 345Ω, replace the drive motor cooling fan per Procedure 6.7.
14. If you have performed all of the above procedures and have been unable to correct the
problem, call Precor Customer Support.
15. Set the treadmills circuit breaker in the "off" position. Remove the F3 fan fuse from the lower
logic PCA. Set the treadmills circuit breaker in the "on" position.
16. Measure the DC voltage between terminals 1 & 3 of connector J7 on the lower logic PCA.
The meter should read approximately 5 Vdc. If the reading is correct go to step 19. If the
reading is 0 or significantly low, continue with step 17.
17. Remove the fan sense plug from the J7 connector on the lower logic PCA and repeat step
16. If the reading is now correct, replace the fan sense PCA per Procedure 6.5. If the
reading is still 0 or significantly low, replace the lower logic PCA.
18. If you have performed all of the above procedures and have been unable to correct the
problem, call Precor Customer Support.
19. Connect the DC voltmeter between terminals 2 & 3 of connector J7 on the lower logic PCA.
Slowly rotate the fan blade by hand. The voltmeter should alternate between approximately
0 Vdc and 5 Vdc as the fan blade is rotated.
20. If the voltage reading in step 19 does not alternate between 0 Vdc and 5 Vdc and the fan
hub is equipped with a reflective target, replace the fan sense PCA per Procedure 6.5.
21. If you have performed all of the above procedures and have been unable to correct the
problem, call Precor Customer Support.
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C954, C956 Treadmill
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