Precor 9.23 Service Manual page 24

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 5.2.
15. Set the on/off switch in the "on" position. Repeat the measurement in step 14. 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 data cable or the upper PCA.
16. Repeat the measurement in step 14 between the orange and green wires on the upper
PCA JK1 connector. If the reading is still 0 Vdc or significantly low, replace the data 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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