Service manual

C762, C764, C764i Stairclimber
Page 31
9. Refer to block diagram 8.2 and note the ribbon cable connections for “+6V” and “ground”.
Set treadmill circuit breaker in the “off” position. Remove the upper PCA from the display
housing. With the ribbon cable still connected, set the upper PCA on an insulated surface.
Set circuit breaker in the “on” position. Using a DC voltmeter, measure the voltage between
the “+6v” and “ground” connections on the ribbon cable connector on the upper PCA. The
voltage should read approximately 6 Vdc ± 0.5 Vdc. If the voltage is correct, replace the
upper PCA. If the voltage is missing or incorrect, continue with the next step.
10. Set the circuit breaker in the “off” position. Remove the ribbon cable from the upper PCA.
Set the treadmill’s circuit breaker in the “on” position. Check the 6 Vdc voltage (as in step
5) on the ribbon cable connector. If the voltage is correct, replace the upper PCA. If the
voltage is missing or incorrect, continue with step 7.
11. Set the circuit breaker in the “off” position. Remove the ribbon cable from the lower PCA.
Set the treadmill’s circuit breaker in the “on” position. Check the 6 Vdc voltage (as in step 5)
on the lower PCA ribbon cable connector. If the voltage is correct, replace the ribbon cable.
If the voltage is missing or incorrect, replace the lower PCA.
12. If you have performed all of the above procedures and are unable to resolve the problem,
contact Precor customer support.