9.31, 9.33, 9.35 Treadmill
Page 26
3. Measure the voltage between terminal 1 of J3. (red wire) and terminal 4 of J3 (black wire) on
the lower PCA, see Diagram 5.2. The voltage should read approximately 5 Vdc. If the
voltage is missing or significantly low, disconnect the speed sensor plug from the lower
PCA. Measure the voltage between pins 1 & 4 of the J3 connector on the lower PCA. If the
voltage is approximately 5 Vdc, replace the speed sensor. If the voltage is missing or
significantly low, replace the lower logic PCA.
4. If at this point the speed sensor output is good, but a speed error occurs, replace the upper
PCA.
5. 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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