Precor 9.23 Service Manual page 23

10. If the readings in step 8 are not correct, press the circuit breaker's reset button and repeat
the measurements in step 8. If the readings are still not correct, replace the circuit breaker
per Procedure 6.6.
11. Test the safety key circuit per Procedure 5.5. If the safety key circuit is functioning correctly,
continue with step 11.
12. Set the on/off switch in the "off" position and remove the AC power from the AC outlet.
Referring to Diagram 5.2, remove the fuse from the lower PCA. With an ohmmeter, measure
across the fuse, it should read approximately, 0.2Ω. If the reading is significantly high,
replace the fuse with an appropriate 3 amp slow blow fuse.
13. The problem has now been narrowed down to either the lower PCA, the interconnect cable
between the lower and upper PCA and the upper PCA.
Diagram 5.6 - JK1 Connector, Lower PCA
14. With a DC voltmeter, measure between VCC (orange wire) and GND (green wire) on the
JK1 connector on the lower PCA. The reading should be approximately 16 Vdc. If the
reading is 0 Vdc or significantly low, set the on/off switch in the "off" position, remove the
four screws that fasten the backplate to the console and remove the Jk1 connector from the
upper PCA. Refer to Diagram 6.9.
15. Set the on/off switch in the "on" position. Repeat the measurement in step 13. If the reading
is still 0 Vdc or significantly low, replace the lower PCA. If the reading is now correct, the
problem is either the interconnect cable or the upper PCA.
16. Repeat the measurement in step 13 between the orange and green wires on the upper
PCA JK1 connector. If the reading is still 0 Vdc or significantly low, replace the interconnect
cable. If the reading is now correct, replace the upper PCA.
17. If you have performed all of the procedures above and have been unable to correct the
problem, call Precor customer support.
9.23, 9.27 Treadmill
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