Precor 9.23 Service Manual page 44

Procedure 6.9 - Replacing the Safety Key Switch
1. Set the treadmill's on/off switch in the "off" position and remove the treadmill's power cord
from the AC outlet.
2. A grounded anti-static wrist strap must be worn whenever the upper PCA is being handled.
3. Remove the four screws that fasten the backplate to the rear of the console. Refer to
Diagram 6.9.
4. Disconnect the data cable from the JK8 connector and the heart rate cable from the JK5
connector on the console. See Diagram 5.1.
5. Remove the six screws that fasten the console rear cover to the display face, remove the
console rear cover.
6. Disconnect the safety switch connector JK7 from the upper PCA. Remove the two screws
that fasten the safety switch to the display face. Remove the safety switch cable from the
safety switch.
7. Set the replacement safety switch in its mounting position on the display face and fasten it
with the hardware removed in step 6.
8. Connect the safety switch cable to the safety switch and to the JK7 connector on the upper
PCA.
9. Set the console rear cover in its mounting position on the display face and fasten it with the
hardware removed in step 5.
10. Connect the data cable to the JK8 connector on the console and the JK1 connector of the
lower PCA. See Diagram 5.1.
11. Set the console in its mounting position on the backplate and fasten it with the hardware
removed in step 3.Check treadmill operation per Section 3
9.23, 9.27 Treadmill
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