Procedure 6.3 - Replacing The Lower Pca - Precor 9.23 Service Manual

Procedure 6.3 - Replacing the Lower PCA

Note: If the lower PCA is replaced, the treadmill calibration procedure (Procedure 2.3) must be
performed to ensure proper operation.
1. Set the treadmill's on/off switch in the "off" position and remove the AC power cord from the
AC outlet.
2. A grounded anti-static wrist strap must be worn whenever the lower PCA is being handled.
3. Remove the treadmill's hood.
4. Remove the JK1, JK2, JK3 and JK4 connectors from the lower PCA. Remove the wires from
the T1 (AC1), T2 (AC2), T3 (M-) and T4 (M+) terminals on the lower PCA.
5. Remove the two screws that fasten the lower PCA to the frame and remove the lower PCA
from the treadmill.
6. Set the replacement lower PCA at its mounting position and fasten it with the hardware
removed in step 5.
7. Connect the JK1, JK2, JK3 and JK4 connectors to the replacement lower PCA. Refer to
Diagram 5.2 for the correct positioning of these connectors.
8. Connect the red wire (from the circuit breaker) to terminal T1 (AC1) of the lower PCA, red-
black wire to T2 (AC2) of the lower PCA, the red wire (from the drive motor) to T3 (M+) of
the lower PCA and black wire to T4 (M-) of the lower PCA.
9. Replace the treadmill's hood. Insert the AC power cord into the AC outlet and set the on/off
switch in the "on" position.
10. Perform Procedure 2.3, treadmill calibration. Test the treadmill per Procedure 3.
Diagram 6.2 - Lower PCA Mounting
Lower PCA
9.23, 9.27 Treadmill
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